ProSnippets Geometry - Esri/arcgis-pro-sdk GitHub Wiki

Language:              C#  
Subject:               Geometry  
Contributor:           ArcGIS Pro SDK Team <[email protected]>  
Organization:          esri, http://www.esri.com  
Date:                  10/22/2024  
ArcGIS Pro:            3.4  
Visual Studio:         2022  
.NET Target Framework: .Net 8  

SpatialReference

Construct a SpatialReference - from a well-known ID

// Use a builder convenience method or use a builder constructor.

// SpatialReferenceBuilder convenience methods don't need to run on the MCT.
SpatialReference sr3857 = SpatialReferenceBuilder.CreateSpatialReference(3857);

// SpatialReferenceBuilder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (SpatialReferenceBuilder srBuilder = new SpatialReferenceBuilder(3857))
  {
    // do something with the builder

    sr3857 = srBuilder.ToSpatialReference();
  }
});

Construct a SpatialReference - from a string

// Use a builder convenience method or use a builder constructor.

string wkt = "GEOGCS[\"MyGCS84\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Radian\",1.0]]";

// SpatialReferenceBuilder convenience methods don't need to run on the MCT.
SpatialReference sr = SpatialReferenceBuilder.CreateSpatialReference(wkt);

// SpatialReferenceBuilder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (SpatialReferenceBuilder builder = new SpatialReferenceBuilder(wkt))
  {
    // do something with the builder

    SpatialReference anotherSR = builder.ToSpatialReference();
  }
});

Use WGS84 SpatialReference

SpatialReference wgs84 = SpatialReferences.WGS84;
bool isProjected = wgs84.IsProjected;     // false
bool isGeographic = wgs84.IsGeographic;   // true

Construct a SpatialReference with a vertical coordinate system - from well-known IDs

// Use a builder convenience method or use a builder constructor.

// see a list of vertical coordinate systems at http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#/Vertical_coordinate_systems/02r3000000rn000000/

// Builder convenience methods don't need to run on the MCT.
// 4326 = GCS_WGS_1984
// 115700 = vertical WGS_1984
SpatialReference sr4326_115700 = SpatialReferenceBuilder.CreateSpatialReference(4326, 115700);

// SpatialReferenceBuilder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (SpatialReferenceBuilder sb = new SpatialReferenceBuilder(4326, 115700))
  {
    // SpatialReferenceBuilder properties
    //   sb.wkid == 4326
    //   sb.Wkt == "GEOGCS["MyGCS84",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT[\"Radian\",1.0]]"
    //   sb.name == GCS_WGS_1984
    //   sb.vcsWkid == 115700
    //   sb.VcsWkt == "VERTCS["WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]]

    // do something with the builder

    sr4326_115700 = sb.ToSpatialReference();
  }
});

Construct a SpatialReference with a vertical coordinate system - from a string

// Use a builder convenience method or use a builder constructor.

// custom VCS - use vertical shift of -1.23 instead of 0
string custom_vWkt = @"VERTCS[""SHD_height"",VDATUM[""Singapore_Height_Datum""],PARAMETER[""Vertical_Shift"",-1.23],PARAMETER[""Direction"",-1.0],UNIT[""Meter"",1.0]]";

// Builder convenience methods don't need to run on the MCT.
SpatialReference sr4326_customVertical = SpatialReferenceBuilder.CreateSpatialReference(4326, custom_vWkt);
// SpatialReferenceBuilder properties
//   sr4326_customVertical.wkid == 4326
//   sr4326_customVertical.vert_wkid == 0
//   sr4326_customVertical.vert_wkt == custom_vWkt
//   sr4326_customVertical.hasVcs == true

// SpatialReferenceBuilder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (SpatialReferenceBuilder sb = new SpatialReferenceBuilder(4326, custom_vWkt))
  {
    // do something with the builder

    sr4326_customVertical = sb.ToSpatialReference();
  }
});

Construct a SpatialReference with a custom PCS - from a string

// Use a builder convenience method or use a builder constructor.

// Custom PCS, Predefined GCS
string customWkt = "PROJCS[\"WebMercatorMile\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator_Auxiliary_Sphere\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",0.0],PARAMETER[\"Standard_Parallel_1\",0.0],PARAMETER[\"Auxiliary_Sphere_Type\",0.0],UNIT[\"Mile\",1609.344000614692]]";

// Builder convenience methods don't need to run on the MCT.
SpatialReference spatialReference = SpatialReferenceBuilder.CreateSpatialReference(customWkt);
// SpatialReferenceBuilder properties
//   spatialReference.Wkt == customWkt
//   spatialReference.Wkid == 0
//   spatialReference.VcsWkid == 0
//   spatialReference.GcsWkid == 4326

SpatialReference gcs = spatialReference.Gcs;
// gcs.Wkid == 4326
// gcs.IsGeographic == true
// spatialReference.GcsWkt == gcs.Wkt

// SpatialReferenceBuilder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (SpatialReferenceBuilder sb = new SpatialReferenceBuilder(customWkt))
  {
    // do something with the builder

    spatialReference = sb.ToSpatialReference();
  }
});

SpatialReference Properties

// SpatialReferenceBuilder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  // use the builder constructor
  using (SpatialReferenceBuilder srBuilder = new SpatialReferenceBuilder(3857))
  {
    // spatial reference builder properties
    int builderWkid = srBuilder.Wkid;
    string builderWkt = srBuilder.Wkt;
    string builderName = srBuilder.Name;

    double xyScale = srBuilder.XYScale;
    double xyTolerance = srBuilder.XYTolerance;
    double xyResolution = srBuilder.XYResolution;
    Unit unit = srBuilder.Unit;

    double zScale = srBuilder.ZScale;
    double zTolerance = srBuilder.ZTolerance;
    Unit zUnit = srBuilder.ZUnit;

    double mScale = srBuilder.MScale;
    double mTolerance = srBuilder.MTolerance;

    double falseX = srBuilder.FalseX;
    double falseY = srBuilder.FalseY;
    double falseZ = srBuilder.FalseZ;
    double falseM = srBuilder.FalseM;

    // get the spatial reference
    SpatialReference sr3857 = srBuilder.ToSpatialReference();

    // spatial reference properties
    int srWkid = sr3857.Wkid;
    string srWkt = sr3857.Wkt;
    string srName = sr3857.Name;

    xyScale = sr3857.XYScale;
    xyTolerance = sr3857.XYTolerance;
    xyResolution = sr3857.XYResolution;
    unit = sr3857.Unit;

    zScale = sr3857.ZScale;
    zTolerance = sr3857.ZTolerance;
    zUnit = sr3857.ZUnit;

    mScale = sr3857.MScale;
    mTolerance = sr3857.MTolerance;

    falseX = sr3857.FalseX;
    falseY = sr3857.FalseY;
    falseZ = sr3857.FalseZ;
    falseM = sr3857.FalseM;

    bool hasVcs = sr3857.HasVcs;
  }
});

SpatialReference WKT2

SpatialReference sr = SpatialReferences.WebMercator;

// Get Esri WKT
string wkt = sr.Wkt;
/*
  PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",
   GEOGCS["GCS_WGS_1984",
    DATUM["D_WGS_1984",
     SPHEROID["WGS_1984", 6378137.0, 298.257223563]],
    PRIMEM["Greenwich", 0.0],
    UNIT["Degree", 0.0174532925199433]],
   PROJECTION["Mercator_Auxiliary_Sphere"],
   PARAMETER["False_Easting", 0.0],
   PARAMETER["False_Northing", 0.0],
   PARAMETER["Central_Meridian", 0.0],
   PARAMETER["Standard_Parallel_1", 0.0],
   PARAMETER["Auxiliary_Sphere_Type", 0.0],
   UNIT["Meter", 1.0]]
*/

// Get OGC WKT2
string wkt2 = sr.GetWkt2(WktFormatMode.None);
/*
  PROJCRS["WGS_1984_Web_Mercator_Auxiliary_Sphere",
   BASEGEOGCRS["GCS_WGS_1984",
    DYNAMIC[FRAMEEPOCH[1990.5], MODEL["AM0-2"]],
    DATUM["D_WGS_1984",
     ELLIPSOID["WGS_1984", 6378137.0, 298.257223563, LENGTHUNIT["Meter", 1.0]]],
    PRIMEM["Greenwich", 0.0, ANGLEUNIT["Degree", 0.0174532925199433]],
    CS[ellipsoidal, 2],
    AXIS["Latitude (lat)", north, ORDER[1]],
    AXIS["Longitude (lon)", east, ORDER[2]],
    ANGLEUNIT["Degree", 0.0174532925199433]],
   CONVERSION["Mercator_Auxiliary_Sphere",
    METHOD["Mercator_Auxiliary_Sphere"],
    PARAMETER["False_Easting", 0.0, LENGTHUNIT["Meter", 1.0]],
    PARAMETER["False_Northing", 0.0, LENGTHUNIT["Meter", 1.0]],
    PARAMETER["Central_Meridian", 0.0, ANGLEUNIT["Degree", 0.0174532925199433]],
    PARAMETER["Standard_Parallel_1", 0.0, ANGLEUNIT["Degree", 0.0174532925199433]],
    PARAMETER["Auxiliary_Sphere_Type", 0.0]],
   CS[Cartesian, 2],
   AXIS["Easting (X)", east, ORDER[1]],
   AXIS["Northing (Y)", north, ORDER[2]],
   LENGTHUNIT["Meter", 1.0]]
*/

// You can create a spatial reference with the Esri WKT string or the OCG WKT2 string
sr = SpatialReferenceBuilder.CreateSpatialReference(wkt2);

// Get OGC WKT2 including authority in top-level objects
// In this case the authority is written as ID["EPSG",3857]
wkt2 = sr.GetWkt2(WktFormatMode.AuthorityTop);
/*  
  PROJCRS["WGS_1984_Web_Mercator_Auxiliary_Sphere",
   BASEGEOGCRS["GCS_WGS_1984",
   DYNAMIC[FRAMEEPOCH[1990.5],MODEL["AM0-2"]],
   DATUM["D_WGS_1984",
    ELLIPSOID["WGS_1984",6378137.0,298.257223563,LENGTHUNIT["Meter",1.0]]],
   PRIMEM["Greenwich",0.0,ANGLEUNIT["Degree",0.017453292519943295]],
   CS[ellipsoidal,2],
   AXIS["Latitude (lat)",north,ORDER[1]],
   AXIS["Longitude(lon)",east,ORDER[2]],
   ANGLEUNIT["Degree",0.017453292519943295]],
   CONVERSION["Mercator_Auxiliary_Sphere",
    METHOD["Mercator_Auxiliary_Sphere"],
    PARAMETER["False_Easting",0.0,LENGTHUNIT["Meter",1.0]],
    PARAMETER["False_Northing",0.0,LENGTHUNIT["Meter",1.0]],
    PARAMETER["Central_Meridian",0.0,ANGLEUNIT["Degree",0.017453292519943295]],
    PARAMETER["Standard_Parallel_1",0.0,ANGLEUNIT["Degree",0.017453292519943295]],
    PARAMETER["Auxiliary_Sphere_Type",0.0]],
    CS[Cartesian,2],
    AXIS["Easting (X)",east,ORDER[1]],
    AXIS["Northing (Y)",north,ORDER[2]],
    LENGTHUNIT["Meter",1.0],
    ID["EPSG",3857]]
*/

// Get OGC WKT2 including authority in all objects
// Authority is written as ID["ESPG",<id>] or ID["Esri",<id>]
wkt2 = sr.GetWkt2(WktFormatMode.AuthorityAll);
/*
  PROJCRS["WGS_1984_Web_Mercator_Auxiliary_Sphere",
   BASEGEOGCRS["GCS_WGS_1984",
    DYNAMIC[FRAMEEPOCH[1990.5],MODEL["AM0-2"]],
    DATUM["D_WGS_1984",
     ELLIPSOID["WGS_1984",6378137.0,298.257223563,LENGTHUNIT["Meter",1.0,ID["EPSG",9001]],ID["EPSG",7030]],
     ID["EPSG",6326]],
    PRIMEM["Greenwich",0.0,ANGLEUNIT["Degree",0.017453292519943295,ID["EPSG",9102]],ID["EPSG",8901]],
    CS[ellipsoidal,2],
    AXIS["Latitude (lat)",north,ORDER[1]],
    AXIS["Longitude(lon)",east,ORDER[2]],
    ANGLEUNIT["Degree",0.017453292519943295,ID["EPSG",9102]],ID["EPSG",4326]],
    CONVERSION["Mercator_Auxiliary_Sphere",
     METHOD["Mercator_Auxiliary_Sphere",ID["Esri",43104]],
     PARAMETER["False_Easting",0.0,LENGTHUNIT["Meter",1.0,ID["EPSG",9001]],ID["Esri",100001]],
     PARAMETER["False_Northing",0.0,LENGTHUNIT["Meter",1.0,ID["EPSG",9001]],ID["Esri",100002]],
     PARAMETER["Central_Meridian",0.0,ANGLEUNIT["Degree",0.017453292519943295,ID["EPSG",9102]],ID["Esri",100010]],
     PARAMETER["Standard_Parallel_1",0.0,ANGLEUNIT["Degree",0.017453292519943295,ID["EPSG",9102]],ID["Esri",100025]],
     PARAMETER["Auxiliary_Sphere_Type",0.0,ID["Esri",100035]]],
    CS[Cartesian,2],
    AXIS["Easting(X)",east,ORDER[1]],
    AXIS["Northing (Y)",north,ORDER[2]],
    LENGTHUNIT["Meter",1.0,ID["EPSG",9001]],
    ID["EPSG",3857]]
*/

Import and Export Spatial Reference

SpatialReference srWithVertical = SpatialReferenceBuilder.CreateSpatialReference(4326, 6916);

string xml = srWithVertical.ToXml();
SpatialReference importedSR = SpatialReferenceBuilder.FromXml(xml);
// importedSR.Wkid = 4326
// importedSR.VcsWkid = 6916

string json = srWithVertical.ToJson();
importedSR = SpatialReferenceBuilder.FromJson(json);
// importedSR.Wkid = 4326
// importedSR.VcsWkid = 6916

Determine grid convergence for a SpatialReference at a given point

Coordinate2D coordinate = new Coordinate2D(10, 30);
double angle = SpatialReferences.WGS84.GetConvergenceAngle(coordinate);
// angle = 0

SpatialReference srUTM30N = SpatialReferenceBuilder.CreateSpatialReference(32630);
coordinate.X = 500000;
coordinate.Y = 550000;
angle = srUTM30N.GetConvergenceAngle(coordinate);
// angle = 0

MapPoint pointWGS84 = MapPointBuilderEx.CreateMapPoint(10, 50, SpatialReferences.WGS84);
MapPoint pointUTM30N = GeometryEngine.Instance.Project(
  pointWGS84, srUTM30N) as MapPoint;

coordinate = (Coordinate2D)pointUTM30N;
// get convergence angle and convert to degrees
angle = srUTM30N.GetConvergenceAngle(coordinate) * 180 / Math.PI;
// angle = 10.03

Datum

var cimMapDefinition = MapView.Active.Map.GetDefinition();
// use if map's sr does not have a vertical coordinate system
var datumTransformations = cimMapDefinition.DatumTransforms;
// use if map's sr has a vertical coordinate system
var hvDatumTransformations = cimMapDefinition.HVDatumTransforms;

SpatialReference Datum and datum properties

// Get datum of a spatial reference
SpatialReference srWgs84 = SpatialReferences.WGS84;
Datum datum = srWgs84.Datum;
// datum.Name = "D_WGS_1984"
// datum.Wkid = 6326
// datum.SpheroidName = "WGS_1984"
// datum.SpheroidWkid = 7030
// datum.SpheroidFlattening = 0.0033528106647474805
// datum.SpheroidSemiMajorAxis = 6378137.0
// datum.SpheroidSemiMinorAxis = 6356752.3142451793

// Custom WKT
string wyomingWkt = "PROJCS[\"Wyoming_State_Pl_NAD_1927\",GEOGCS[\"GCS_North_American_1927\",DATUM[\"D_North_American_1927_Perry\",SPHEROID[\"Clarke_1866_Chase\",6378210.0,250.0]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"false_easting\",500000.0],PARAMETER[\"false_northing\",0.0],PARAMETER[\"central_meridian\",-107.3333333],PARAMETER[\"scale_factor\",0.9999412],PARAMETER[\"latitude_of_origin\",40.66666667],UNIT[\"Foot_US\",0.3048006096012192]]";
SpatialReference srFromWkt = SpatialReferenceBuilder.CreateSpatialReference(wyomingWkt);
datum = srWgs84.Datum;
// datum.Name = "D_North_American_1927_Perry"
// datum.Wkid = 0
// datum.SpheroidName = "Clarke_1866_Chase"
// datum.SpheroidWkid = 0
// datum.SpheroidFlattening = 0.004
// datum.SpheroidSemiMajorAxis = 6378210.0
// datum.SpheroidSemiMinorAxis = 6352697.16

Coordinate3D

Vector Polar Coordinates

Coordinate3D polarVector = new Coordinate3D(0, 7, 0);
Tuple<double, double, double> polarComponents = polarVector.QueryPolarComponents();
// polarComponents.Item1 = 0  (azimuth)
// polarComponents.Item2 = 0 (inclination)
// polarComponents.Item3 = 7 (magnitude)

polarVector.SetPolarComponents(Math.PI / 4, Math.PI / 2, 8);
polarComponents = polarVector.QueryComponents();
// polarComponents.Item1 = 0 (x)
// polarComponents.Item2 = 0 (y)
// polarComponents.Item3 = 7 (z)

Getting vector inclination

Coordinate3D v = new Coordinate3D(0, 0, 7);
double inclination = v.Inclination;         // inclination = PI/2

v.SetComponents(-2, -3, 0);
inclination = v.Inclination;                // inclination = 0

v.SetComponents(0, 0, -2);
inclination = v.Inclination;                // inclination = -PI/2

Getting vector azimuth

Coordinate3D vector = new Coordinate3D(0, 7, 0);
double azimuth = vector.Azimuth;      // azimuth = 0

vector.SetComponents(1, 1, 42);
azimuth = vector.Azimuth;
double degrees = AngularUnit.Degrees.ConvertFromRadians(azimuth);       // degrees = 45

vector.SetComponents(-8, 8, 2);
azimuth = vector.Azimuth;
degrees = AngularUnit.Degrees.ConvertFromRadians(azimuth);              // degrees = 315

Vector Operations

// Easy 3D vectors
Coordinate3D v = new Coordinate3D(0, 1, 0);
// v.Magnitude = 1

Coordinate3D other = new Coordinate3D(-1, 0, 0);
// other.Magnitude = -1

double dotProduct = v.DotProduct(other);      // dotProduct = 0

Coordinate3D crossProduct = v.CrossProduct(other);
// crossProduct.X = 0
// crossProduct.Y = 0
// crossProduct.Z = 1

Coordinate3D addVector = v.AddCoordinate3D(other);
// addVector.X = -1
// addVector.Y = 1
// addVector.Z = 0

// Rotate around x-axis
Coordinate3D w = v;
w.Rotate(Math.PI, other);
// w.X = 0
// w.Y = -1
// w.Z = 0

w.Scale(0.5);
// w.X = 0
// w.Y = -0.5
// w.Z = 0

w.Scale(-4);
// w.X = 0
// ww.Y = 2
// w.Z = 0
// w.Magnitude = 2

w.Move(3, 2, 0);
// w.X = 3
// w.Y = 4
// w.Z = 0
// w.Magnitude = 5


Coordinate3D emptyVector = new Coordinate3D();
// emptyVector = (0, 0, 0)
emptyVector.SetEmpty();
// emptyVector = (Nan, Nan, Nan)

Coordinate3D c1 = new Coordinate3D(2, 3, 4);
Coordinate3D c2 = new Coordinate3D(9, -1, 3);

var result_add = c1 + c2;
// result_add = (11, 2, 7)
var result_sub = c1 - c2;
// result_sub = (-7, 4, 1)

var b = result_sub != result_add;
// b = true

result_add = emptyVector + c1;
// result_add = (Nan, Nan, Nan)

b = result_add == emptyVector;
// b = true

2D Vector Operations

Coordinate2D v = new Coordinate2D(0, 1);
// v.Magnitude = 1

Coordinate2D other = new Coordinate2D(-1, 0);
double dotProduct = v.DotProduct(other);
// dotProduct = 0

Coordinate2D w = v + other;
// w = (-1, 1)

w += other;
// w = (-2, 1)

w -= other;
// w = (-1, 1)

w = v;
w.Rotate(Math.PI, other);
// w = (-2, -1)

w = other;

w.Scale(-4);
// w = (4, 0)
// w.Magnitude = 4

w.Move(-1, 4);
// w = (3, 4)
// w.Magnitude = 5

w.Move(-6, -1);
Tuple<double, double> components = w.QueryComponents();
// components = (-3, 3)
// w.Magnitude = 3 * Math.Sqrt(2)

Coordinate2D unitVector = w.GetUnitVector();
// w = (-Math.Sqrt(2) / 2, Math.Sqrt(2) / 2)
// w.Magnitude = 1


w.SetComponents(3, 4);

Builder Properties

Builder Properties

// list of points
List<MapPoint> points = new List<MapPoint>
{
  MapPointBuilderEx.CreateMapPoint(0, 0, 2, 3, 1),
  MapPointBuilderEx.CreateMapPoint(1, 1, 5, 6),
  MapPointBuilderEx.CreateMapPoint(2, 1, 6),
  MapPointBuilderEx.CreateMapPoint(0, 0)
};

// will have attributes because it is created with convenience method
Polyline polylineWithAttrs = PolylineBuilderEx.CreatePolyline(points);
bool hasZ = polylineWithAttrs.HasZ;          // hasZ = true
bool hasM = polylineWithAttrs.HasM;          // hasM = true
bool hasID = polylineWithAttrs.HasID;        // hasID = true

// will not have attributes because it is specified as a parameter
Polyline polylineWithoutAttrs = 
  PolylineBuilderEx.CreatePolyline(points, AttributeFlags.None);
hasZ = polylineWithoutAttrs.HasZ;          // hasZ = false
hasM = polylineWithoutAttrs.HasM;          // hasM = false
hasID = polylineWithoutAttrs.HasID;        // hasID = false

// will have attributes because it is created with convenience method
Polygon polygonWithAttrs = PolygonBuilderEx.CreatePolygon(points);
hasZ = polygonWithAttrs.HasZ;               // hasZ = true
hasM = polygonWithAttrs.HasM;               // hasM = true
hasID = polygonWithAttrs.HasID;             // hasID = true

// will not have attributes because it is specified as a parameter
Polygon polygonWithoutAttrs = 
      PolygonBuilderEx.CreatePolygon(points, AttributeFlags.None);
hasZ = polygonWithoutAttrs.HasZ;               // hasZ = false
hasM = polygonWithoutAttrs.HasM;               // hasM = false
hasID = polygonWithoutAttrs.HasID;             // hasID = false

// will not have attributes because it is specified as a parameter
PolylineBuilderEx polylineB = 
           new PolylineBuilderEx(points, AttributeFlags.None);
hasZ = polylineB.HasZ;                      // hasZ = false
hasM = polylineB.HasM;                      // hasM = false
hasID = polylineB.HasID;                    // hasID = false

// will have attributes because it is passed an attributed polyline
polylineB = new PolylineBuilderEx(polylineWithAttrs);
hasZ = polylineB.HasZ;                      // hasZ = true
hasM = polylineB.HasM;                      // hasM = true
hasID = polylineB.HasID;                    // hasID = true

// will not have attributes because it is passed a non-attributed polyline
polylineB = new PolylineBuilderEx(polylineWithoutAttrs);
hasZ = polylineB.HasZ;                      // hasZ = false
hasM = polylineB.HasM;                      // hasM = false
hasID = polylineB.HasID;                    // hasID = false

// will not have attributes because it is specified as a parameter
PolygonBuilderEx polygonB = new PolygonBuilderEx(points, AttributeFlags.None);
hasZ = polygonB.HasZ;                       // hasZ = false
hasM = polygonB.HasM;                       // hasM = false
hasID = polygonB.HasID;                     // hasID = false

// will have attributes because it is passed an attributed polygon
polygonB = new PolygonBuilderEx(polygonWithAttrs);
hasZ = polygonB.HasZ;                       // hasZ = true
hasM = polygonB.HasM;                       // hasM = true
hasID = polygonB.HasID;                     // hasID = true

// will not have attributes because it is passed a non-attributed polygon
polygonB = new PolygonBuilderEx(polygonWithoutAttrs);
hasZ = polygonB.HasZ;                       // hasZ = true
hasM = polygonB.HasM;                       // hasM = true
hasID = polygonB.HasID;                     // hasID = true

MapPoint

Construct a MapPoint

// Use a builder convenience method or use a builder constructor.

// Create a 2D point without a spatial reference
MapPoint point2D = MapPointBuilderEx.CreateMapPoint(1, 2);
SpatialReference sr = point2D.SpatialReference; // sr = null
bool hasZ = point2D.HasZ;   // hasZ = false
bool hasM = point2D.HasM;   // hasM = false
bool hasID = point2D.HasID; // hasID = false
double x = point2D.X;   // x = 1
double y = point2D.Y;   // y = 2
double z = point2D.Z;   // z = 0 default value
double m = point2D.M;   // m is NaN default value
double id = point2D.ID; // id = 0 default value

// Or use a builderEx which doesn't need to run on the MCT. 
MapPointBuilderEx builderEx = new MapPointBuilderEx(1, 2);

// do something with the builder
builderEx.Y = 3;
point2D = builderEx.ToGeometry();
sr = point2D.SpatialReference; // sr = null
hasZ = point2D.HasZ;   // hasZ = false
hasM = point2D.HasM;   // hasM = false
hasID = point2D.HasID; // hasID = false
x = point2D.X;   // x = 1
y = point2D.Y;   // y = 3
z = point2D.Z;   // z = 0 default value
m = point2D.M;   // m is NaN default value
id = point2D.ID; // id = 0 default value

// Create a 2D point with a spatial reference
SpatialReference spatialReference = SpatialReferenceBuilder.CreateSpatialReference(4269);
point2D = MapPointBuilderEx.CreateMapPoint(1, 2, spatialReference);
sr = point2D.SpatialReference; // sr != null
int wkid = sr.Wkid; // wkid = 4269

// Or use a builder
builderEx = new MapPointBuilderEx(1, 2, spatialReference);

// Do something with the builder
builderEx.SetValues(3, 5);
point2D = builderEx.ToGeometry();
sr = point2D.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 4269
x = point2D.X; // x = 3
y = point2D.Y; // y = 5

// Change the spatial reference of the builder
builderEx.SpatialReference = SpatialReferences.WGS84;
point2D = builderEx.ToGeometry();
sr = point2D.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 4326
x = point2D.X; // x = 3
y = point2D.Y; // y = 5

// Create a 3D point with M
MapPoint pointZM = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4);
sr = pointZM.SpatialReference; // sr = null
hasZ = pointZM.HasZ;   // hasZ = true
hasM = pointZM.HasM;   // hasM = true
hasID = pointZM.HasID; // hasID = false
x = pointZM.X;   // x = 1
y = pointZM.Y;   // y = 2
z = pointZM.Z;   // z = 3
m = pointZM.M;   // m = 4
id = pointZM.ID; // id = 0 default value

// Create a 3D point with M and a spatial reference
pointZM = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, spatialReference);
sr = pointZM.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 4269

// Create a point from another point in three ways
MapPoint clone = pointZM.Clone() as MapPoint; // Has the same values including the spatial reference as pointZM
MapPoint anotherZM = MapPointBuilderEx.CreateMapPoint(pointZM);  // Has the same values including the spatial reference as pointZM

builderEx = new MapPointBuilderEx(pointZM); // Has the same values including the spatial reference as pointZM
// Do something with the builder
builderEx.HasM = false;
builderEx.ID = 7; // Setting the id also sets HasID = true
MapPoint pointZId = builderEx.ToGeometry();
sr = pointZId.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 4269
hasZ = pointZId.HasZ;   // hasZ = true
hasM = pointZId.HasM;   // hasM = false
hasID = pointZId.HasID; // hasID = true
x = pointZId.X;   // x = 1
y = pointZId.Y;   // y = 2
z = pointZId.Z;   // z = 3
m = pointZId.M;   // m is NaN, default value
id = pointZId.ID; // id = 7

// Create a point with Z, M, and ID-values
MapPoint pointZMId = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, 5, spatialReference);
sr = pointZMId.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 4269
hasZ = pointZMId.HasZ;   // hasZ = true
hasM = pointZMId.HasM;   // hasM = true
hasID = pointZMId.HasID; // hasID = true
x = pointZMId.X;   // x = 1
y = pointZMId.Y;   // y = 2
z = pointZMId.Z;   // z = 3
m = pointZMId.M;   // m = 4
id = pointZMId.ID; // id = 5

// Pick and choose which attributes to include
MapPoint point = MapPointBuilderEx.CreateMapPoint(1, 2, false, 3, true, 4, true, 5);
sr = point.SpatialReference; // sr = null
hasZ = point.HasZ;   // hasZ = false
hasM = point.HasM;   // hasM = true
hasID = point.HasID; // hasID = true
x = point.X;   // x = 1
y = point.Y;   // y = 2
z = point.Z;   // z = 0, default value
m = point.M;   // m = 4
id = point.ID; // id = 5

// Or use a builder
builderEx = new(1, 2, true, 3, false, 4, true, 5);
// Do something with the builder
builderEx.ID = 7;
builderEx.SpatialReference = SpatialReferences.WGS84;
point = builderEx.ToGeometry();
sr = point.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 4326
hasZ = point.HasZ;   // hasZ = true
hasM = point.HasM;   // hasM = false
hasID = point.HasID; // hasID = true
x = point.X;   // x = 1
y = point.Y;   // y = 2
z = point.Z;   // z = 0, default value
m = point.M;   // m is NaN, default value
id = point.ID; // id = 7

MapPoint Builder Properties

// MapPointBuilderEx constructors can run on any thread.

MapPoint point1 = null;
MapPoint point2 = null;

SpatialReference spatialReference = SpatialReferenceBuilder.CreateSpatialReference(54004);

MapPointBuilderEx mapPointBuilder = new MapPointBuilderEx(100, 200, spatialReference);
SpatialReference sr = mapPointBuilder.SpatialReference; // sr != null
int wkid = sr.Wkid; // wkid = 54004
bool hasZ = mapPointBuilder.HasZ;   // hasZ = false
bool hasM = mapPointBuilder.HasM;   // hasM = false
bool hasID = mapPointBuilder.HasID; // hasID = false
bool isEmpty = mapPointBuilder.IsEmpty; // isEmpty = false
double x = mapPointBuilder.X;   // x = 100
double y = mapPointBuilder.Y;   // y = 200
double z = mapPointBuilder.Z;   // z = 0, default value
double m = mapPointBuilder.M;   // m is NaN, default value
double id = mapPointBuilder.ID; // id = 0, default value

// Do something with the builder
mapPointBuilder.Z = 12; // Setting the z-value automatically sets HasZ property to true

point1 = mapPointBuilder.ToGeometry();
sr = point1.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 54004
hasZ = point1.HasZ;   // hasZ = true
hasM = point1.HasM;   // hasM = false
hasID = point1.HasID; // hasID = false
x = point1.X;   // x = 100
y = point1.Y;   // y = 200
z = point1.Z;   // z = 12
m = point1.M;   // m is NaN, default value
id = point1.ID; // id = 0, default value

// Change some of the builder properties
mapPointBuilder.SetValues(11, 22);
mapPointBuilder.HasZ = false;
mapPointBuilder.HasM = true;
mapPointBuilder.M = 44;

// Create another point
point2 = mapPointBuilder.ToGeometry();

bool isEqual = point1.IsEqual(point2); // isEqual = false

// Set the builder to empty
// Sets X and Y to NaN. Sets other attributes to the default values.
// Does not change the attribute awareness.
mapPointBuilder.SetEmpty();

MapPoint point3 = mapPointBuilder.ToGeometry();
sr = point3.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 54004
hasZ = point3.HasZ;        // hasZ = false
hasM = point3.HasM;        // hasM = true
hasID = point3.HasID;      // hasID = false
isEmpty = point3.IsEmpty;  // isEmpty = true
x = point3.X;              // x is NaN
y = point3.Y;              // y is NaN
z = point3.Z;              // z = 0, default value
m = point3.M;              // m is NaN, default value
id = point3.ID;            // ID = 0, default value

// Create a builder from a point
mapPointBuilder = new MapPointBuilderEx(point2); // point1 = (11, 22, 0, 44, 0)
sr = mapPointBuilder.SpatialReference; // sr != null
wkid = sr.Wkid; // wkid = 54004
hasZ = mapPointBuilder.HasZ;        // hasZ = false
hasM = mapPointBuilder.HasM;        // hasM = true
hasID = mapPointBuilder.HasID;      // hasID = false
isEmpty = mapPointBuilder.IsEmpty;  // isEmpty = false
x = mapPointBuilder.X;              // x = 11
y = mapPointBuilder.Y;              // y = 22
z = mapPointBuilder.Z;              // z = 0, default value
m = mapPointBuilder.M;              // m = 44
id = mapPointBuilder.ID;            // ID = 0, default value

// Setting attribute values automatically sets the corresponding flag to true
mapPointBuilder.Z = 150;
mapPointBuilder.ID = 2;

// Remove the spatial reference
mapPointBuilder.SpatialReference = null;

MapPoint point4 = mapPointBuilder.ToGeometry() as MapPoint;
sr = point3.SpatialReference; // sr = null
hasZ = point3.HasZ;        // hasZ = true
hasM = point3.HasM;        // hasM = true
hasID = point3.HasID;      // hasID = true
isEmpty = point3.IsEmpty;  // isEmpty = false
x = point3.X;              // x = 11
y = point3.Y;              // y = 22
z = point3.Z;              // z = 150
m = point3.M;              // m = 44
id = point3.ID;            // ID = 2

MapPoint IsEqual

MapPoint pt1 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, 5);
int ID = pt1.ID;           // ID = 5
bool hasID = pt1.HasID;     // hasID = true

MapPoint pt2 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, 0);
ID = pt2.ID;        // ID = 0
hasID = pt2.HasID;  // hasID = true

MapPoint pt3 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4);
ID = pt3.ID;          // ID = 0
hasID = pt3.HasID;    // hasID = false

MapPoint pt4 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 44);
ID = pt4.ID;          // ID = 0
hasID = pt4.HasID;    // hasID = false
bool hasM = pt4.HasM; // hasM = true

MapPoint pt5 = MapPointBuilderEx.CreateMapPoint(1, 2, 3);
ID = pt5.ID;          // ID = 0
hasID = pt5.HasID;    // hasID = false
hasM = pt5.HasM;      // hasM = false

bool isEqual = pt1.IsEqual(pt2);   // isEqual = false, different IDs
isEqual = pt2.IsEqual(pt3);        // isEqual = false, HasId is different
isEqual = pt4.IsEqual(pt3);        // isEqual = false, different Ms
isEqual = pt1.IsEqual(pt5);        // isEqual = false, pt has M, id but pt5 does not.  

Zoom to a specified point

//Create a point
var pt = MapPointBuilderEx.CreateMapPoint(x, y, 
               SpatialReferenceBuilder.CreateSpatialReference(4326));
//Buffer it - for purpose of zoom
var poly = GeometryEngine.Instance.Buffer(pt, buffer_size);

//do we need to project the buffer polygon?
if (!MapView.Active.Map.SpatialReference.IsEqual(poly.SpatialReference))
{
  //project the polygon
  poly = GeometryEngine.Instance.Project(poly, MapView.Active.Map.SpatialReference);
}

// Must run on MCT.
QueuedTask.Run(() =>
{
  //Zoom - add in a delay for animation effect
  MapView.Active.ZoomTo(poly, new TimeSpan(0, 0, 0, 3));
});

Polyline

Construct a Polyline - from an enumeration of MapPoints

// Use a builderEx convenience method or a builderEx constructor.
// neither need to run on the MCT

MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0);

List<MapPoint> list = new List<MapPoint>() { startPt, endPt };

Polyline polyline = PolylineBuilderEx.CreatePolyline(list, SpatialReferences.WGS84);

// use AttributeFlags.None since we only have 2D points in the list
PolylineBuilderEx pb = new PolylineBuilderEx(list, AttributeFlags.None);
pb.SpatialReference = SpatialReferences.WGS84;
Polyline polyline2 = pb.ToGeometry();

// Use AttributeFlags.NoAttributes because we only have 2d points in the list
Polyline polyline4 = PolylineBuilderEx.CreatePolyline(list, AttributeFlags.None);

Get the points of a Polyline

// get the points as a readonly Collection
ReadOnlyPointCollection pts = polyline.Points;
int numPts = polyline.PointCount;

// OR   get an enumeration of the points
IEnumerator<MapPoint> enumPts = polyline.Points.GetEnumerator();

// OR   get the point coordinates as a readonly list of Coordinate2D
IReadOnlyList<Coordinate2D> coordinates = polyline.Copy2DCoordinatesToList();

// OR   get the point coordinates as a readonly list of Coordinate3D
IReadOnlyList<Coordinate3D> coordinates3D = polyline.Copy3DCoordinatesToList();

// OR   get a subset of the collection as Coordinate2D using preallocated memory

IList<Coordinate2D> coordinate2Ds = new List<Coordinate2D>(10);   // allocate some space
ICollection<Coordinate2D> subsetCoordinates2D = coordinate2Ds;    // assign
pts.Copy2DCoordinatesToList(1, 2, ref subsetCoordinates2D);       // copy 2 elements from index 1 into the allocated list
                                                                  // coordinate2Ds.Count = 2
                                                                  // do something with the coordinate2Ds

// without allocating more space, obtain a different set of coordinates
pts.Copy2DCoordinatesToList(5, 9, ref subsetCoordinates2D);       // copy 9 elements from index 5 into the allocated list
                                                                  // coordinate2Ds.Count = 9


// OR   get a subset of the collection as Coordinate3D using preallocated memory

IList<Coordinate3D> coordinate3Ds = new List<Coordinate3D>(15);   // allocate some space
ICollection<Coordinate3D> subsetCoordinates3D = coordinate3Ds;    // assign
pts.Copy3DCoordinatesToList(3, 5, ref subsetCoordinates3D);       // copy 5 elements from index 3 into the allocated list
                                                                  // coordinate3Ds.Count = 5


// OR   get a subset of the collection as MapPoint using preallocated memory

IList<MapPoint> mapPoints = new List<MapPoint>(7);   // allocate some space
ICollection<MapPoint> subsetMapPoint = mapPoints;    // assign
pts.CopyPointsToList(1, 4, ref subsetMapPoint);      // copy 4 elements from index 1 into the allocated list
                                                     // mapPoints.Count = 4

Get the parts of a Polyline

int numParts = polyline.PartCount;
// get the parts as a readonly collection
ReadOnlyPartCollection parts = polyline.Parts;

Enumerate the parts of a Polyline

ReadOnlyPartCollection polylineParts = polyline.Parts;

// enumerate the segments to get the length
double len = 0;
IEnumerator<ReadOnlySegmentCollection> segments = polylineParts.GetEnumerator();
while (segments.MoveNext())
{
  ReadOnlySegmentCollection seg = segments.Current;
  foreach (Segment s in seg)
  {
    len += s.Length;

    // perhaps do something specific per segment type
    switch (s.SegmentType)
    {
      case SegmentType.Line:
        break;
      case SegmentType.Bezier:
        break;
      case SegmentType.EllipticArc:
        break;
    }
  }
}

// or use foreach pattern
foreach (var part in polyline.Parts)
{
  foreach (var segment in part)
  {
    len += segment.Length;

    // perhaps do something specific per segment type
    switch (segment.SegmentType)
    {
      case SegmentType.Line:
        break;
      case SegmentType.Bezier:
        break;
      case SegmentType.EllipticArc:
        break;
    }
  }
}

Reverse the order of points in a Polyline

var polylineBuilder = new PolylineBuilderEx(polyline);
polylineBuilder.ReverseOrientation();
Polyline reversedPolyline = polylineBuilder.ToGeometry();

Get the segments of a Polyline

ICollection<Segment> collection = new List<Segment>();
polyline.GetAllSegments(ref collection);
int numSegments = collection.Count;    // = 10

IList<Segment> iList = collection as IList<Segment>;
for (int i = 0; i < numSegments; i++)
{
  // do something with iList[i]
}

// use the segments to build another polyline
Polyline polylineFromSegments = PolylineBuilderEx.CreatePolyline(collection);

Build a multi-part Polyline

List<MapPoint> firstPoints = new List<MapPoint>();
firstPoints.Add(MapPointBuilderEx.CreateMapPoint(1.0, 1.0));
firstPoints.Add(MapPointBuilderEx.CreateMapPoint(1.0, 2.0));
firstPoints.Add(MapPointBuilderEx.CreateMapPoint(2.0, 2.0));
firstPoints.Add(MapPointBuilderEx.CreateMapPoint(2.0, 1.0));

List<MapPoint> nextPoints = new List<MapPoint>();
nextPoints.Add(MapPointBuilderEx.CreateMapPoint(11.0, 1.0));
nextPoints.Add(MapPointBuilderEx.CreateMapPoint(11.0, 2.0));
nextPoints.Add(MapPointBuilderEx.CreateMapPoint(12.0, 2.0));
nextPoints.Add(MapPointBuilderEx.CreateMapPoint(12.0, 1.0));

// use AttributeFlags.None since we have 2D points in the list
PolylineBuilderEx pBuilder = new PolylineBuilderEx(firstPoints, AttributeFlags.None);
pBuilder.AddPart(nextPoints);

Polyline polyline = pBuilder.ToGeometry();
// polyline has 2 parts

pBuilder.RemovePart(0);
polyline = pBuilder.ToGeometry();
// polyline has 1 part

StartPoint of a Polyline

// Method 1: Get the start point of the polyline by converting the polyline 
//    into a collection of points and getting the first point

// sketchGeometry is a Polyline
// get the sketch as a point collection
var pointCol = ((Multipart)sketchGeometry).Points;
// Get the start point of the line
var firstPoint = pointCol[0];

// Method 2: Convert polyline into a collection of line segments 
//   and get the "StartPoint" of the first line segment.
var polylineGeom = sketchGeometry as ArcGIS.Core.Geometry.Polyline;
var polyLineParts = polylineGeom.Parts;

ReadOnlySegmentCollection polylineSegments = polyLineParts.First();

//get the first segment as a LineSegment
var firsLineSegment = polylineSegments.First() as LineSegment;

//Now get the start Point
var startPoint = firsLineSegment.StartPoint;

Construct a Clothoid by Angle

MapPoint startPoint = MapPointBuilderEx.CreateMapPoint(0, 0);
double tangentDirection = Math.PI / 6;
ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
double startRadius = double.PositiveInfinity;
double endRadius = 0.2;
ClothoidCreateMethod createMethod = ClothoidCreateMethod.ByAngle;
double angle = Math.PI / 2;
CurveDensifyMethod densifyMethod = CurveDensifyMethod.ByLength;
double densifyParameter = 0.1;

Polyline polyline = PolylineBuilderEx.CreatePolyline(startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, angle, densifyMethod, densifyParameter, SpatialReferences.WGS84);

int numPoints = polyline.PointCount;
MapPoint queryPoint = polyline.Points[numPoints - 2];

MapPoint pointOnPath;
double radiusCalculated, tangentDirectionCalculated, lengthCalculated, angleCalculated;

PolylineBuilderEx.QueryClothoidParameters(queryPoint, startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, angle, out pointOnPath, out radiusCalculated, out tangentDirectionCalculated, out lengthCalculated, out angleCalculated, SpatialReferences.WGS84);

Construct a Clothoid by Length

MapPoint startPoint = MapPointBuilderEx.CreateMapPoint(0, 0);
MapPoint queryPoint = MapPointBuilderEx.CreateMapPoint(3.8, 1);
double tangentDirection = 0;
ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
double startRadius = double.PositiveInfinity;
double endRadius = 1;
ClothoidCreateMethod createMethod = ClothoidCreateMethod.ByLength;
double curveLength = 10;
MapPoint pointOnPath;
double radiusCalculated, tangentDirectionCalculated, lengthCalculated, angleCalculated;


PolylineBuilderEx.QueryClothoidParameters(queryPoint, startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, out pointOnPath, out radiusCalculated, out tangentDirectionCalculated, out lengthCalculated, out angleCalculated, SpatialReferences.WGS84);

pointOnPath = MapPointBuilderEx.CreateMapPoint(3.7652656620171379, 1.0332006103128575);
radiusCalculated = 2.4876382887687227;
tangentDirectionCalculated = 0.80797056423543978;
lengthCalculated = 4.0198770235802987;
angleCalculated = 0.80797056423544011;

queryPoint = MapPointBuilderEx.CreateMapPoint(1.85, 2.6);

PolylineBuilderEx.QueryClothoidParameters(queryPoint, startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, out pointOnPath, out radiusCalculated, out tangentDirectionCalculated, out lengthCalculated, out angleCalculated, SpatialReferences.WGS84);

pointOnPath = MapPointBuilderEx.CreateMapPoint(1.8409964973501549, 2.6115979967308132);
radiusCalculated = 1;
tangentDirectionCalculated = -1.2831853071795867;
lengthCalculated = 10;
angleCalculated = 5;
 
tangentDirection = Math.PI / 4;
orientation = ArcOrientation.ArcClockwise;
startRadius = double.PositiveInfinity;
endRadius = 0.8;
createMethod = ClothoidCreateMethod.ByLength;
curveLength = 10;

Polyline polyline = PolylineBuilderEx.CreatePolyline(startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, CurveDensifyMethod.ByLength, 0.5, SpatialReferences.WGS84);

Split Polyline at distance

// create list of points
MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0);

List<MapPoint> list = new List<MapPoint>() { startPt, endPt };

// BuilderEx constructors don't need to run on the MCT.

// use the PolylineBuilder as we wish to manipulate the geometry
// use AttributeFlags.None as we have 2D points
PolylineBuilderEx polylineBuilder = new PolylineBuilderEx(list, AttributeFlags.None);
// split at a distance 0.75
polylineBuilder.SplitAtDistance(0.75, false);
// get the polyline
Polyline polyline = polylineBuilder.ToGeometry();
// polyline should have 3 points  (1,1), (1.75, 1), (2,1)

// add another path
MapPoint p1 = MapPointBuilderEx.CreateMapPoint(4.0, 1.0);
MapPoint p2 = MapPointBuilderEx.CreateMapPoint(6.0, 1.0);
MapPoint p3 = MapPointBuilderEx.CreateMapPoint(7.0, 1.0);
List<MapPoint> pts = new List<MapPoint>() { p1, p2, p3 };

polylineBuilder.AddPart(pts);
polyline = polylineBuilder.ToGeometry();

// polyline has 2 parts. Each part has 3 points

// split the 2nd path half way - don't create a new path
polylineBuilder.SplitPartAtDistance(1, 0.5, true, false);

polyline = polylineBuilder.ToGeometry();

// polyline still has 2 parts; but now has 7 points 

Create 3D Polyline and set Z-values while preserving curve segments

PolylineBuilderEx polylineBuilder = new PolylineBuilderEx(polyline);
polylineBuilder.HasZ = true;

// The HasZ property is set to true for all the points in
// polyline3D when you call ToGeometry().
Polyline polyline3D = polylineBuilder.ToGeometry();

// For this example, create Z-values. 
// You may want to pass them in as a parameter.
int numPoints = polyline3D.PointCount;
double[] zValues = new double[numPoints];
for (int i = 0; i < numPoints; i++)
{
  zValues[i] = i % 2 == 0 ? 2 : 1;
}

// We need to know at which point index each part starts
int partPointIndex = 0;  
int numParts = polyline3D.PartCount;

for (int i = 0; i < numParts; i++)
{
  var part = polyline3D.Parts[i];
  int numSegments = part.Count;

  for (int j = 0; j < numSegments; j++)
  {
    Segment segment = part[j];

    MapPointBuilderEx pointBuilder = new MapPointBuilderEx(segment.StartPoint);
    pointBuilder.Z = zValues[partPointIndex++];
    MapPoint startPoint = pointBuilder.ToGeometry();

    // Make sure that the end point of this segment is the same as the start point of the next segment
    pointBuilder = new MapPointBuilderEx(segment.EndPoint);
    pointBuilder.Z = zValues[partPointIndex];
    MapPoint endPoint = pointBuilder.ToGeometry();

    SegmentType segmentType = segment.SegmentType;
    SegmentBuilderEx segmentBuilder = null;
    switch (segmentType)
    {
      case SegmentType.Line:
        segmentBuilder = new LineBuilderEx((LineSegment)segment);
        break;
      case SegmentType.Bezier:
        segmentBuilder = new CubicBezierBuilderEx((CubicBezierSegment)segment);
        break;
      case SegmentType.EllipticArc:
        segmentBuilder = new EllipticArcBuilderEx((EllipticArcSegment)segment);
        break;
    }

    // Only change the start and end point which now have Z-values set. 
    // This will preserve the curve if the segment is an EllipticArcSegment or CubicBezierSegment.
    segmentBuilder.StartPoint = startPoint;
    segmentBuilder.EndPoint = endPoint;
    segment = segmentBuilder.ToSegment();

    polylineBuilder.ReplaceSegment(i, j, segment);
  }

  // Move point index for the next part
  partPointIndex++;
}

polyline3D = polylineBuilder.ToGeometry();
return polyline3D;

Polygon

Construct a Polygon - from an enumeration of MapPoints

// Use a builderEx convenience method or use a builderEx constructor.

MapPoint pt1 = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint pt2 = MapPointBuilderEx.CreateMapPoint(1.0, 2.0);
MapPoint pt3 = MapPointBuilderEx.CreateMapPoint(2.0, 2.0);
MapPoint pt4 = MapPointBuilderEx.CreateMapPoint(2.0, 1.0);

List<MapPoint> list = new List<MapPoint>() { pt1, pt2, pt3, pt4 };

Polygon polygon = PolygonBuilderEx.CreatePolygon(list, SpatialReferences.WGS84);
// polygon.HasZ will be false - it is determined by the HasZ flag of the points in the list

// or specifically use AttributeFlags.NoAttributes
polygon = PolygonBuilderEx.CreatePolygon(list, AttributeFlags.None);

// use AttributeFlags.None as we have 2D points
PolygonBuilderEx polygonBuilder = new PolygonBuilderEx(list, AttributeFlags.None);
polygonBuilder.SpatialReference = SpatialReferences.WGS84;
polygon = polygonBuilder.ToGeometry();

Construct a Polygon - from an Envelope

// Use a builderEx convenience method or use a builderEx constructor.

MapPoint minPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint maxPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0);

// Create an envelope
Envelope env = EnvelopeBuilderEx.CreateEnvelope(minPt, maxPt);

Polygon polygonFromEnv = PolygonBuilderEx.CreatePolygon(env);

PolygonBuilderEx polygonBuilderEx = new PolygonBuilderEx(env);
polygonBuilderEx.SpatialReference = SpatialReferences.WGS84;
polygonFromEnv = polygonBuilderEx.ToGeometry() as Polygon;

Get the points of a Polygon

// get the points as a readonly Collection
ReadOnlyPointCollection pts = polygon.Points;

// get an enumeration of the points
IEnumerator<MapPoint> enumPts = polygon.Points.GetEnumerator();

// get the point coordinates as a readonly list of Coordinate2D
IReadOnlyList<Coordinate2D> coordinates = polygon.Copy2DCoordinatesToList();

// get the point coordinates as a readonly list of Coordinate3D
IReadOnlyList<Coordinate3D> coordinates3D = polygon.Copy3DCoordinatesToList();

Get the parts of a Polygon

// get the parts as a readonly collection
ReadOnlyPartCollection parts = polygon.Parts;

Enumerate the parts of a Polygon

int numSegments = 0;
IEnumerator<ReadOnlySegmentCollection> segments = polygon.Parts.GetEnumerator();
while (segments.MoveNext())
{
  ReadOnlySegmentCollection seg = segments.Current;
  numSegments += seg.Count;
  foreach (Segment s in seg)
  {
    // do something with the segment
  }
}

Get the segments of a Polygon

List<Segment> segmentList = new List<Segment>(30);
ICollection<Segment> collection = segmentList;
polygon.GetAllSegments(ref collection);
// segmentList.Count = 4
// segmentList.Capacity = 30

// use the segments to build another polygon
Polygon polygonFromSegments = PolygonBuilderEx.CreatePolygon(collection);

Build a donut polygon

List<Coordinate2D> outerCoordinates = new List<Coordinate2D>();
outerCoordinates.Add(new Coordinate2D(10.0, 10.0));
outerCoordinates.Add(new Coordinate2D(10.0, 20.0));
outerCoordinates.Add(new Coordinate2D(20.0, 20.0));
outerCoordinates.Add(new Coordinate2D(20.0, 10.0));

// define the inner polygon as anti-clockwise
List<Coordinate2D> innerCoordinates = new List<Coordinate2D>();
innerCoordinates.Add(new Coordinate2D(13.0, 13.0));
innerCoordinates.Add(new Coordinate2D(17.0, 13.0));
innerCoordinates.Add(new Coordinate2D(17.0, 17.0));
innerCoordinates.Add(new Coordinate2D(13.0, 17.0));

PolygonBuilderEx pbEx = new PolygonBuilderEx(outerCoordinates);
Polygon donutEx = pbEx.ToGeometry() as Polygon;
double areaEx = donutEx.Area;       // area = 100

pbEx.AddPart(innerCoordinates);
donutEx = pbEx.ToGeometry() as Polygon;

areaEx = donutEx.Area;    // area = 84.0

areaEx = GeometryEngine.Instance.Area(donutEx);    // area = 84.0

Create an N-sided regular polygon

// <summary>
// Create an N-sided regular polygon.  A regular sided polygon is a polygon that is equiangular (all angles are equal in measure) 
// and equilateral (all sides are equal in length).  See https://en.wikipedia.org/wiki/Regular_polygon
// </summary>
// <param name="numSides">The number of sides in the polygon.</param>
// <param name="center">The center of the polygon.</param>
// <param name="radius">The distance from the center of the polygon to a vertex.</param>
// <param name="rotation">The rotation angle in radians of the start point of the polygon. The start point will be
// rotated counterclockwise from the positive x-axis.</param>
// <returns>N-sided regular polygon.</returns>
// <exception cref="ArgumentException">Number of sides is less than 3.</exception>
public Polygon CreateRegularPolygon(int numSides, Coordinate2D center, double radius, double rotation)
{
  if (numSides < 3)
    throw new ArgumentException();

  Coordinate2D[] coords = new Coordinate2D[numSides + 1];

  double centerX = center.X;
  double centerY = center.Y;
  double x = radius * Math.Cos(rotation) + centerX;
  double y = radius * Math.Sin(rotation) + centerY;
  Coordinate2D start = new Coordinate2D(x, y);
  coords[0] = start;

  double da = 2 * Math.PI / numSides;
  for (int i = 1; i < numSides; i++)
  {
    x = radius * Math.Cos(i * da + rotation) + centerX;
    y = radius * Math.Sin(i * da + rotation) + centerY;

    coords[i] = new Coordinate2D(x, y);
  }

  coords[numSides] = start;

  return PolygonBuilderEx.CreatePolygon(coords);
}

Get the exterior rings of a polygon - polygon.GetExteriorRing

public void GetExteriorRings(Polygon inputPolygon)
{
  if (inputPolygon == null || inputPolygon.IsEmpty)
    return;

  // polygon part count
  int partCount = inputPolygon.PartCount;
  // polygon exterior ring count
  int numExtRings = inputPolygon.ExteriorRingCount;
  // get set of exterior rings for the polygon
  IList<Polygon> extRings = inputPolygon.GetExteriorRings();

  // test each part for "exterior ring"
  for (int idx = 0; idx < partCount; idx++)
  {
    bool isExteriorRing = inputPolygon.IsExteriorRing(idx);
    var ring = inputPolygon.GetExteriorRing(idx);
  }
}

Envelope

Construct an Envelope

// Use a builderEx convenience method or use a builderEx constructor.

MapPoint minPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint maxPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0);

Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(minPt, maxPt);

EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(minPt, maxPt);
envelope = builderEx.ToGeometry() as Envelope;

Construct an Envelope - from a JSON string

string jsonString = "{ \"xmin\" : 1, \"ymin\" : 2,\"xmax\":3,\"ymax\":4,\"spatialReference\":{\"wkid\":4326}}";
Envelope envFromJson = EnvelopeBuilderEx.FromJson(jsonString);

Union two Envelopes

// use the convenience builders
Envelope env1 = EnvelopeBuilderEx.CreateEnvelope(0, 0, 1, 1, SpatialReferences.WGS84);
Envelope env2 = EnvelopeBuilderEx.CreateEnvelope(0.5, 0.5, 1.5, 1.5, SpatialReferences.WGS84);

Envelope env3 = env1.Union(env2);

double area = env3.Area;
double depth = env3.Depth;
double height = env3.Height;
double width = env3.Width;
double len = env3.Length;

MapPoint centerPt = env3.Center;
Coordinate2D coord = env3.CenterCoordinate;

bool isEmpty = env3.IsEmpty;
int pointCount = env3.PointCount;

// coordinates
//env3.XMin, env3.XMax, env3.YMin, env3.YMax
//env3.ZMin, env3.ZMax, env3.MMin, env3.MMax

bool isEqual = env1.IsEqual(env2);    // false

// or use the builderEx constructors which don't need to run on the MCT.
EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(0, 0, 1, 1, SpatialReferences.WGS84);
builderEx.Union(env2);      // builder is updated to the result

depth = builderEx.Depth;
height = builderEx.Height;
width = builderEx.Width;

centerPt = builderEx.Center;
coord = builderEx.CenterCoordinate;

isEmpty = builderEx.IsEmpty;

env3 = builderEx.ToGeometry() as Envelope;

Intersect two Envelopes

// use the convenience builders
Envelope env1 = EnvelopeBuilderEx.CreateEnvelope(0, 0, 1, 1, SpatialReferences.WGS84);
Envelope env2 = EnvelopeBuilderEx.CreateEnvelope(0.5, 0.5, 1.5, 1.5, SpatialReferences.WGS84);

bool intersects = env1.Intersects(env2); // true
Envelope env3 = env1.Intersection(env2);


// or use the builderEx constructors which don't need to run on the MCT.
EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(0, 0, 1, 1, SpatialReferences.WGS84);
intersects = builderEx.Intersects(env2);
builderEx.Intersection(env2);   // note this sets the builder to the intersection
env3 = builderEx.ToGeometry() as Envelope;

Expand an Envelope

// Use a builderEx convenience method or use a builderEx constructor.

// convenience methods don't need to run on the MCT.
Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(100.0, 100.0, 500.0, 500.0);

// shrink the envelope by 50%
Envelope result = envelope.Expand(0.5, 0.5, true);


// builderEx constructors don't need to run on the MCT.
EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(100.0, 100.0, 500.0, 500.0);
builderEx.Expand(0.5, 0.5, true);
envelope = builderEx.ToGeometry() as Envelope;

Update Coordinates of an Envelope

Coordinate2D minCoord = new Coordinate2D(1, 3);
Coordinate2D maxCoord = new Coordinate2D(2, 4);

Coordinate2D c1 = new Coordinate2D(0, 5);
Coordinate2D c2 = new Coordinate2D(1, 3);


// use the EnvelopeBuilderEx.  This constructor doesn't need to run on the MCT.

EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(minCoord, maxCoord);
// builderEx.XMin, YMin, Zmin, MMin  = 1, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 2, 4, 0, double.Nan

// set XMin.  if XMin > XMax; both XMin and XMax change
builderEx.XMin = 6;
// builderEx.XMin, YMin, ZMin, MMin  = 6, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 6, 4, 0, double.Nan

// set XMax
builderEx.XMax = 8;
// builderEx.XMin, YMin, ZMin, MMin  = 6, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 8, 4, 0, double.Nan

// set XMax.  if XMax < XMin, both XMin and XMax change
builderEx.XMax = 3;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 0, double.Nan

// set YMin
builderEx.YMin = 2;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 0, double.Nan

// set ZMin.  if ZMin > ZMax, both ZMin and ZMax change
builderEx.ZMin = 3;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, 3, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 3, double.Nan

// set ZMax.  if ZMax < ZMin. both ZMin and ZMax change
builderEx.ZMax = -1;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, -1, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, -1, double.Nan

builderEx.SetZCoords(8, -5);
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, -5, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 8, double.Nan


builderEx.SetXYCoords(c1, c2);
// builderEx.XMin, YMin, ZMin, MMin  = 0, 3, -5, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 1, 5, 8, double.Nan


builderEx.HasM = true;
builderEx.SetMCoords(2, 5);

var geomEx = builderEx.ToGeometry();

Multipoint

Construct a Multipoint - from an enumeration of MapPoints

// Use a builderEx convenience method or use a builderEx constructor.

List<MapPoint> list = new List<MapPoint>();
list.Add(MapPointBuilderEx.CreateMapPoint(1.0, 1.0));
list.Add(MapPointBuilderEx.CreateMapPoint(1.0, 2.0));
list.Add(MapPointBuilderEx.CreateMapPoint(2.0, 2.0));
list.Add(MapPointBuilderEx.CreateMapPoint(2.0, 1.0));

// use the builderEx constructors which don't need to run on the MCT.
// use AttributeFlags.NoAttributes since we have 2d points in the list
MultipointBuilderEx builderEx = new MultipointBuilderEx(list, AttributeFlags.None);
Multipoint multiPoint = builderEx.ToGeometry() as Multipoint;
int ptCount = builderEx.PointCount;

// builderEx convenience methods don't need to run on the MCT
multiPoint = MultipointBuilderEx.CreateMultipoint(list);
// multiPoint.HasZ, HasM, HasID will be false - the attributes are determined 
//    based on the attribute state of the points in the list

// or specifically set the state
multiPoint = MultipointBuilderEx.CreateMultipoint(list, AttributeFlags.None);
// multiPoint.HasM = false

multiPoint = MultipointBuilderEx.CreateMultipoint(list, AttributeFlags.HasM);
// multiPoint.HasM = true

ptCount = multiPoint.PointCount;

Construct a Multipoint - using MultipointBuilderEx

Coordinate2D[] coordinate2Ds = new Coordinate2D[] { new Coordinate2D(1, 2), new Coordinate2D(-1, -2) };
SpatialReference sr = SpatialReferences.WGS84;

MultipointBuilderEx builder = new MultipointBuilderEx(coordinate2Ds, sr);

// builder.PointCount = 2

builder.HasZ = true;
// builder.Zs.Count = 2
// builder.Zs[0] = 0
// builder.Zs[1] = 0

builder.HasM = true;
// builder.Ms.Count = 2
// builder.Ms[0] = NaN
// builder.Ms[1] = NaN

builder.HasID = true;
// builder.IDs.Count = 2
// builder.IDs[0] = 0
// builder.IDs[1] = 0

// set it empty
builder.SetEmpty();
// builder.Coords.Count = 0
// builder.Zs.Count = 0
// builder.Ms.Count = 0
// builder.IDs.Count = 0


// reset coordinates
List<Coordinate2D> inCoords = new List<Coordinate2D>() { new Coordinate2D(1, 2), new Coordinate2D(3, 4), new Coordinate2D(5, 6) };
builder.Coordinate2Ds = inCoords;
// builder.Coords.Count = 3
// builder.HasZ = true
// builder.HasM = true
// builder.HasID = true

double[] zs = new double[] { 1, 2, 1, 2, 1, 2 };
builder.Zs = zs;   
// builder.Zs.Count = 6

double[] ms = new double[] { 0, 1 };
builder.Ms = ms;   
// builder.Ms.Count = 2

// coordinates are now   (x, y, z, m, id)
//  (1, 2, 1, 0, 0), (3, 4, 2, 1, 0) (5, 6, 1, NaN, 0)

MapPoint mapPoint = builder.GetPoint(2);
// mapPoint.HasZ = true
// mapPoint.HasM = true
// mapPoint.HasID = true
// mapPoint.Z  = 1
// mapPoint.M = NaN
// mapPoint.ID = 0

// add an M to the list
builder.Ms.Add(2);
// builder.Ms.count = 3

// coordinates are now   (x, y, z, m, id)
//  (1, 2, 1, 0, 0), (3, 4, 2, 1, 0) (5, 6, 1, 2, 0)

// now get the 2nd point again; it will now have an M value
mapPoint = builder.GetPoint(2);
// mapPoint.M = 2


int[] ids = new int[] { -1, -2, -3 };
// assign ID values
builder.IDs = ids;

// coordinates are now   (x, y, z, m, id)
//  (1, 2, 1, 0, -1), (3, 4, 2, 1, -2) (5, 6, 1, 2, -3)


// create a new point
MapPoint point = MapPointBuilderEx.CreateMapPoint(-300, 400, 4);
builder.SetPoint(2, point);

// coordinates are now   (x, y, z, m, id)
//  (1, 2, 1, 0, -1), (3, 4, 2, 1, -2) (-300, 400, 4, NaN, 0)


builder.RemovePoints(1, 3);
// builder.PointCount = 1

Modify the points of a Multipoint

// assume a multiPoint has been built from 4 points
// the modified multiPoint will have the first point removed and the last point moved

// use the builderEx constructors which don't need to run on the MCT.
MultipointBuilderEx builderEx = new MultipointBuilderEx(multipoint);
// remove the first point
builderEx.RemovePoint(0);
// modify the coordinates of the last point
var ptEx = builderEx.GetPoint(builderEx.PointCount - 1);
builderEx.RemovePoint(builderEx.PointCount - 1);

var newPtEx = MapPointBuilderEx.CreateMapPoint(ptEx.X + 1.0, ptEx.Y + 2.0);
builderEx.AddPoint(newPtEx);
Multipoint modifiedMultiPointEx = builderEx.ToGeometry() as Multipoint;

Retrieve Points, 2D Coordinates, 3D Coordinates from a multipoint

ReadOnlyPointCollection points = multipoint.Points;
IReadOnlyList<Coordinate2D> coords2d = multipoint.Copy2DCoordinatesToList();
IReadOnlyList<Coordinate3D> coords3d = multipoint.Copy3DCoordinatesToList();

Line Segment

Construct a LineSegment using two MapPoints

// Use a builderEx convenience method or use a builderEx constructor.

MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0);

// BuilderEx convenience methods don't need to run on the MCT.
LineSegment lineFromMapPoint = LineBuilderEx.CreateLineSegment(startPt, endPt);

// coordinate2D
Coordinate2D start2d = (Coordinate2D)startPt;
Coordinate2D end2d = (Coordinate2D)endPt;

LineSegment lineFromCoordinate2D = LineBuilderEx.CreateLineSegment(start2d, end2d);

// coordinate3D
Coordinate3D start3d = (Coordinate3D)startPt;
Coordinate3D end3d = (Coordinate3D)endPt;

LineSegment lineFromCoordinate3D = LineBuilderEx.CreateLineSegment(start3d, end3d);

// lineSegment
LineSegment anotherLineFromLineSegment = LineBuilderEx.CreateLineSegment(lineFromCoordinate3D);


// builderEx constructors don't need to run on the MCT
LineBuilderEx lbEx = new LineBuilderEx(startPt, endPt);
lineFromMapPoint = lbEx.ToSegment() as LineSegment;

lbEx = new LineBuilderEx(start2d, end2d);
lineFromCoordinate2D = lbEx.ToSegment() as LineSegment;

lbEx = new LineBuilderEx(start3d, end3d);
lineFromCoordinate3D = lbEx.ToSegment() as LineSegment;

lbEx = new LineBuilderEx(startPt, endPt);
lineFromMapPoint = lbEx.ToSegment() as LineSegment;

lbEx = new LineBuilderEx(lineFromCoordinate3D);
anotherLineFromLineSegment = lbEx.ToSegment() as LineSegment;

Alter LineSegment Coordinates

// builderEx constructors don't need to run on the MCT
LineBuilderEx lbuilderEx = new LineBuilderEx(lineSegment);
// find the existing coordinates
lbuilderEx.QueryCoords(out startPt, out endPt);

// or use 
//startPt = lbuilderEx.StartPoint;
//endPt = lbuilderEx.EndPoint;

// update the coordinates
lbuilderEx.SetCoords(GeometryEngine.Instance.Move(startPt, 10, 10) as MapPoint, GeometryEngine.Instance.Move(endPt, -10, -10) as MapPoint);

// or use 
//lbuilderEx.StartPoint = GeometryEngine.Instance.Move(startPt, 10, 10) as MapPoint;
//lbuilderEx.EndPoint = GeometryEngine.Instance.Move(endPt, -10, -10) as MapPoint;

LineSegment segment2 = lbuilderEx.ToSegment() as LineSegment;

Cubic Bezier

Construct a Cubic Bezier - from Coordinates

// Use a builderEx convenience method or a builderEx constructor.

MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, 3.0);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0, 3.0);

Coordinate2D ctrl1Pt = new Coordinate2D(1.0, 2.0);
Coordinate2D ctrl2Pt = new Coordinate2D(2.0, 1.0);

// BuilderEx convenience methods don't need to run on the MCT
CubicBezierSegment bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(startPt, ctrl1Pt, ctrl2Pt, endPt, SpatialReferences.WGS84);

// without a SR
bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(startPt, ctrl1Pt, ctrl2Pt, endPt);


// builderEx constructors don't need to run on the MCT
CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(startPt, ctrl1Pt, ctrl2Pt, endPt);
bezier = cbbEx.ToSegment() as CubicBezierSegment;

// another alternative
cbbEx = new CubicBezierBuilderEx(startPt, ctrl1Pt.ToMapPoint(), ctrl2Pt.ToMapPoint(), endPt);
bezier = cbbEx.ToSegment() as CubicBezierSegment;

Construct a Cubic Bezier - from MapPoints

// Use a builderEx convenience method or a builderEx constructor.

MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, SpatialReferences.WGS84);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0, SpatialReferences.WGS84);

MapPoint ctrl1Pt = MapPointBuilderEx.CreateMapPoint(1.0, 2.0, SpatialReferences.WGS84);
MapPoint ctrl2Pt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0, SpatialReferences.WGS84);

// BuilderEx convenience methods don't need to run on the MCT
CubicBezierSegment bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(startPt, ctrl1Pt, ctrl2Pt, endPt);

// builderEx constructors don't need to run on the MCT
CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(startPt, ctrl1Pt, ctrl2Pt, endPt);
bezier = cbbEx.ToSegment() as CubicBezierSegment;

Construct a Cubic Bezier - from an enumeration of MapPoints

// Use a buildeExr convenience method or use a builderEx constructor.

MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, SpatialReferences.WGS84);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0, SpatialReferences.WGS84);

MapPoint ctrl1Pt = MapPointBuilderEx.CreateMapPoint(1.0, 2.0, SpatialReferences.WGS84);
MapPoint ctrl2Pt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0, SpatialReferences.WGS84);

List<MapPoint> listMapPoints = new List<MapPoint>();
listMapPoints.Add(startPt);
listMapPoints.Add(ctrl1Pt);
listMapPoints.Add(ctrl2Pt);
listMapPoints.Add(endPt);

// BuilderEx convenience methods don't need to run on the MCT
CubicBezierSegment bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(listMapPoints);

// builderEx constructors don't need to run on the MCT
CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(listMapPoints);
bezier = cbbEx.ToSegment() as CubicBezierSegment;

Cubic Bezier Builder Properties

// retrieve the bezier curve's control points

CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(bezierSegment);
MapPoint startPtEx = cbbEx.StartPoint;
Coordinate2D ctrlPt1Ex = cbbEx.ControlPoint1;
Coordinate2D ctrlPt2Ex = cbbEx.ControlPoint2;
MapPoint endPtEx = cbbEx.EndPoint;
     
// or use the QueryCoords method
cbbEx.QueryCoords(out startPtEx, out ctrlPt1Ex, out ctrlPt2Ex, out endPtEx);

Cubic Bezier Properties

// retrieve the bezier curve's control points
CubicBezierSegment cb = CubicBezierBuilderEx.CreateCubicBezierSegment(bezierSegment);
MapPoint startPt = cb.StartPoint;
Coordinate2D ctrlPt1 = cb.ControlPoint1;
Coordinate2D ctrlPt2 = cb.ControlPoint2;
MapPoint endPt = cb.EndPoint;

bool isCurve = cb.IsCurve;
double len = cb.Length;

Construct a Polyline - from a Cubic Bezier

Polyline polyline = PolylineBuilderEx.CreatePolyline(bezierSegment);

Arc

Construct a Circular Arc - using an interior point

// Construct a circular arc from (2, 1) to (1, 2) with interior pt (1 + sqrt(2)/2, 1 + sqrt(2)/2).
// Use a builderEx convenience method or use a builderEx constructor.

MapPoint fromPt = MapPointBuilderEx.CreateMapPoint(2, 1);
MapPoint toPt = MapPointBuilderEx.CreateMapPoint(1, 2);
Coordinate2D interiorPt = new Coordinate2D(1 + Math.Sqrt(2) / 2, 1 + Math.Sqrt(2) / 2);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromPt, toPt, interiorPt);

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx eab = new EllipticArcBuilderEx(fromPt, toPt, interiorPt);
// do something with the builder

EllipticArcSegment anotherCircularArc = eab.ToSegment();

Construct a Circular Arc - using a chord length and bearing

// Construct a circular arc counterclockwise from (2, 1) to (1, 2) such that the embedded 
// circle has center point at (1, 1) and radius = 1.
// Use a builderEx convenience method or use a builderEx constructor.

MapPoint fromPt = MapPointBuilderEx.CreateMapPoint(2, 1, SpatialReferences.WGS84);
double chordLength = Math.Sqrt(2);
double chordBearing = 3 * Math.PI / 4;
double radius = 1;
ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
MinorOrMajor minorOrMajor = MinorOrMajor.Minor;

// BuildeEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromPt, chordLength, chordBearing, radius, orientation, minorOrMajor);

// BuilderEx constructors don't need to run on the MCT either.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(fromPt, chordLength, chordBearing, radius, orientation, minorOrMajor);
// do something with the builder

EllipticArcSegment anotherCircularArc = cab.ToSegment();

Construct a Circular Arc - using a center point, angle and radius

// Construct a circular arc with center point at (0, 0), from angle = 0, 
// central angle = pi/2, radius = 1.
// Use a builderEx convenience method or use a builderEx constructor.

SpatialReference sr4326 = SpatialReferences.WGS84;
Coordinate2D centerPt = new Coordinate2D(0, 0);
double fromAngle = 0;
double centralAngle = Math.PI / 2;
double radius = 1;

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromAngle, centralAngle, centerPt, radius, sr4326);

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(fromAngle, centralAngle, centerPt, radius, sr4326);
EllipticArcSegment otherCircularArc = cab.ToSegment();

Construct an Elliptic Arc - using a center point and rotation angle

// Construct an elliptic arc centered at (1,1), startAngle = 0, centralAngle = PI/2, 
// rotationAngle = 0, semiMajorAxis = 1, minorMajorRatio = 0.5.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPt = new Coordinate2D(1, 1);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateEllipticArcSegment(centerPt, 0, Math.PI / 2, 0, 1, 0.5);

double semiMajor;
double semiMinor;
circularArc.GetAxes(out semiMajor, out semiMinor);
// semiMajor = 1, semiMinor = 0.5

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(centerPt, 0, Math.PI / 2, 0, 1, 0.5);
cab.GetAxes(out semiMajor, out semiMinor);
EllipticArcSegment otherCircularArc = cab.ToSegment();

Construct a Circular Arc - using a center point and orientation

// Construct a circular arc from (2, 1) to (1, 2) 
// with center point at (1, 1) and orientation counterclockwise.
// Use a builderEx convenience method or use a builderEx constructor.

MapPoint toPt = MapPointBuilderEx.CreateMapPoint(1, 2);
MapPoint fromPt = MapPointBuilderEx.CreateMapPoint(2, 1);
Coordinate2D centerPtCoord = new Coordinate2D(1, 1);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromPt, toPt, centerPtCoord, ArcOrientation.ArcCounterClockwise);

// BuilderEx constructors need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(fromPt, toPt, centerPtCoord, ArcOrientation.ArcCounterClockwise);
EllipticArcSegment otherCircularArc = cab.ToSegment();

Construct a Circular Arc - using two segments and radius

// Construct a segment from (100, 100) to (50, 50) and another segment from (100, 100) to (150, 50).
// Use a builderEx convenience method or use a builderEx constructor.

LineSegment segment1 = LineBuilderEx.CreateLineSegment(new Coordinate2D(100, 100), new Coordinate2D(50, 50));
LineSegment segment2 = LineBuilderEx.CreateLineSegment(new Coordinate2D(100, 100), new Coordinate2D(150, 50));

// Construct the hint point to determine where the arc will be constructed.
Coordinate2D hintPoint = new Coordinate2D(100, 75);

// Call QueryFilletRadius to get the minimum and maximum radii that can be used with these segments.
var minMaxRadii = EllipticArcBuilderEx.QueryFilletRadiusRange(segment1, segment2, hintPoint);

// Use the maximum radius to create the arc.
double maxRadius = minMaxRadii.Item2;

// BuilderEx convenience methods don't need to run on the MCT.
//At 2.x - EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateEllipticArcSegment(segment1, segment2, maxRadius, hintPoint);
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(
                    segment1, segment2, maxRadius, hintPoint);

// This EllipticArcBuilderEx constructor needs to run on the MCT either.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(segment1, segment2, maxRadius, hintPoint);
EllipticArcSegment otherCircularArc = cab.ToSegment();

Construct a Circle

// Construct a circle with center at (-1,-1), radius = 2, and oriented clockwise.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPtCoord = new Coordinate2D(-1, -1);

// Builder convenience methods don't need to run on the MCT.
EllipticArcSegment circle = EllipticArcBuilderEx.CreateCircle(centerPtCoord, 2, ArcOrientation.ArcClockwise);
// circle.IsCircular = true
// circle.IsCounterClockwise = false
// circle.IsMinor = false

double startAngle, rotationAngle, centralAngle, semiMajor, semiMinor;
Coordinate2D actualCenterPt;
circle.QueryCoords(out actualCenterPt, out startAngle, out centralAngle, out rotationAngle, out semiMajor, out semiMinor);

// semiMajor = 2.0
// semiMinor = 2.0
// startAngle = PI/2
// centralAngle = -2*PI
// rotationAngle = 0
// endAngle = PI/2

// This EllipticArcBuilderEx constructor doesn't need to run on the MCT.
EllipticArcBuilderEx builder = new EllipticArcBuilderEx(centerPtCoord, 2, ArcOrientation.ArcClockwise);
EllipticArcSegment otherCircle = builder.ToSegment();

Construct an Ellipse

// Construct an ellipse centered at (1, 2) with rotationAngle = -pi/6,  
// semiMajorAxis = 5, minorMajorRatio = 0.2, oriented clockwise.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPt = new Coordinate2D(1, 2);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment ellipse = EllipticArcBuilderEx.CreateEllipse(centerPt, -1 * Math.PI / 6, 5, 0.2, ArcOrientation.ArcClockwise);

// This EllipticArcBuilderEx constructor doesn't need to run on the MCT.
EllipticArcBuilderEx builder = new EllipticArcBuilderEx(centerPt, -1 * Math.PI / 6, 5, 0.2, ArcOrientation.ArcClockwise);
EllipticArcSegment anotherEllipse = builder.ToSegment();

Elliptic Arc Builder Properties

// retrieve the curve's properties
EllipticArcBuilderEx builder = new EllipticArcBuilderEx(arcSegment);
MapPoint startPt = builder.StartPoint;
MapPoint endPt = builder.EndPoint;
Coordinate2D centerPt = builder.CenterPoint;
bool isCircular = builder.IsCircular;
bool isMinor = builder.IsMinor;
double startAngle = builder.StartAngle;
double endAngle = builder.EndAngle;
double centralAngle = builder.CentralAngle;
double rotationAngle = builder.RotationAngle;
ArcOrientation orientation = builder.Orientation;

Elliptic Arc Properties

// retrieve the curve's control points
EllipticArcSegment arc = EllipticArcBuilderEx.CreateEllipticArcSegment(arcSegment);
MapPoint startPt = arc.StartPoint;
MapPoint endPt = arc.EndPoint;
Coordinate2D centerPt = arc.CenterPoint;
bool isCircular = arc.IsCircular;
bool isMinor = arc.IsMinor;
bool isCounterClockwise = arc.IsCounterClockwise;
bool isCurve = arc.IsCurve;
double len = arc.Length;
double ratio = arc.MinorMajorRatio;

double semiMajorAxis, semiMinorAxis;
// get the axes
arc.GetAxes(out semiMajorAxis, out semiMinorAxis);
// or use the properties
// semiMajorAxis = arc.SemiMajorAxis;
// semiMinorAxis = arc.SemiMinorAxis;

double startAngle, centralAngle, rotationAngle;
// or use QueryCoords to get complete information
arc.QueryCoords(out centerPt, out startAngle, out centralAngle, out rotationAngle, out semiMajorAxis, out semiMinorAxis);

// use properties to get angle information
//double endAngle = arc.EndAngle;
//centralAngle = arc.CentralAngle;
//rotationAngle = arc.RotationAngle;
//startAngle = arc.StartAngle;

GeometryBag

Construct GeometryBag

MapPoint point = MapPointBuilderEx.CreateMapPoint(1, 2, SpatialReferences.WebMercator);

List<Coordinate2D> coords2D = new List<Coordinate2D>()
{
  new Coordinate2D(0, 0),
  new Coordinate2D(0, 1),
  new Coordinate2D(1, 1),
  new Coordinate2D(1, 0)
};

Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(coords2D, SpatialReferences.WGS84);
Polyline polyline = PolylineBuilderEx.CreatePolyline(coords2D, SpatialReferences.WebMercator);

GeometryBagBuilderEx builder = new GeometryBagBuilderEx(SpatialReferences.WGS84);

GeometryBag emptyBag = builder.ToGeometry();
// emptyBag.IsEmpty = true

builder.AddGeometry(point);
// builder.GeometryCount = 1

GeometryBag geometryBag = builder.ToGeometry();
// geometryBag.PartCount = 1
// geometryBag.PointCount = 1
// geometryBag.IsEmpty = false

IReadOnlyList<Geometry> geometries = geometryBag.Geometries;
// geometries.Count = 1
// geometries[0] is MapPoint with a sr of WGS84

bool isEqual = geometryBag.IsEqual(emptyBag);   // isEqual = false

builder.InsertGeometry(0, multipoint);
geometryBag = builder.ToGeometry();
// geometryBag.PartCount = 2

geometries = geometryBag.Geometries;
// geometries.Count = 2
// geometries[0] is Multipoint
// geometries[1] is MapPoint

builder.AddGeometry(polyline);
builder.RemoveGeometry(1);
geometryBag = builder.ToGeometry();
// geometryBag.PartCount = 2

geometries = geometryBag.Geometries;
// geometries.Count = 2
// geometries[0] is Multipoint
// geometries[1] is Polyline          

Construct GeometryBag - from an enumeration of geometries

// Use a builder convenience method or use a builder constructor.

MapPoint point = MapPointBuilderEx.CreateMapPoint(10, 20);
List<Coordinate2D> coords = new List<Coordinate2D>() { new Coordinate2D(50, 60), new Coordinate2D(-120, -70), new Coordinate2D(40, 60) };
Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(coords, SpatialReferences.WebMercator);
Polyline polyline = PolylineBuilderEx.CreatePolyline(coords);

string json = "{\"rings\":[[[0,0],[0,1],[1,1],[1,0],[0,0]],[[3,0],[3,1],[4,1],[4,0],[3,0]]]}";
Polygon polygon = PolygonBuilderEx.FromJson(json);

var geometries = new List<Geometry>() { point, multipoint, polyline, polygon };

// Builder convenience methods don't need to run on the MCT.
//At 2.x - GeometryBag bag = GeometryBagBuilder.CreateGeometryBag(geometries, SpatialReferences.WGS84);
var bag = GeometryBagBuilderEx.CreateGeometryBag(geometries, SpatialReferences.WGS84);

//At 2.x - using (var builder = new GeometryBagBuilder(geometries, SpatialReferences.WGS84)) 
var builder = new GeometryBagBuilderEx(geometries, SpatialReferences.WGS84);
// do something with the builder
bag = builder.ToGeometry();

Construct GeometryBag - from JSON, Xml

const string jsonString = "{\"geometries\":[{\"x\":1,\"y\":2},{\"rings\":[[[0,0],[0,4],[3,4],[3,0],[0,0]]]}],\"spatialReference\":{\"wkid\":4326,\"latestWkid\":4326}}";
//At 2.x - GeometryBag geometryBag = GeometryBagBuilder.FromJson(jsonString);
var geometryBag = GeometryBagBuilderEx.FromJson(jsonString);

string xml = geometryBag.ToXml();
//At 2.x - GeometryBag xmlString = GeometryBagBuilder.FromXML(xml);
var xmlString = GeometryBagBuilderEx.FromXml(xml);

Construct GeometryBag - adding or inserting an enumeration of geometries

MapPoint point = MapPointBuilderEx.CreateMapPoint(10, 20);
List<Coordinate2D> coords = new List<Coordinate2D>() { new Coordinate2D(50, 60), new Coordinate2D(-120, -70), new Coordinate2D(40, 60) };
Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(coords, SpatialReferences.WebMercator);
Polyline polyline = PolylineBuilderEx.CreatePolyline(coords);

string json = "{\"rings\":[[[0,0],[0,1],[1,1],[1,0],[0,0]],[[3,0],[3,1],[4,1],[4,0],[3,0]]]}";
Polygon polygon = PolygonBuilderEx.FromJson(json);

var geometries = new List<Geometry>() { point, multipoint, polyline, polygon };

//At 2.x - using (var builder = new GeometryBagBuilder(SpatialReferences.WGS84))
var builder = new GeometryBagBuilderEx(SpatialReferences.WGS84);
builder.AddGeometries(geometries);

GeometryBag geomBag = builder.ToGeometry();
// geomBag.PartCount == 4    (point, multipoint, polyline, polygon)

geometries = new List<Geometry>() { point, polyline };
builder.InsertGeometries(1, geometries);
// builder.GeometryCount == 6
geomBag = builder.ToGeometry();
// geomBag.PartCount == 6    (point, point, polyline, multipoint, polyline, polygon)

Multipatch

Construct Multipatch via Extrusion of Polygon or Polyline

// build a polygon
string json = "{\"hasZ\":true,\"rings\":[[[0,0,0],[0,1,0],[1,1,0],[1,0,0],[0,0,0]]],\"spatialReference\":{\"wkid\":4326}}";
Polygon polygon = PolygonBuilderEx.FromJson(json);

// extrude the polygon by an offset to create a multipatch
Multipatch multipatch = GeometryEngine.Instance.ConstructMultipatchExtrude(polygon, 2);

// a different polygon
json = "{\"hasZ\":true,\"rings\":[[[0,0,1],[0,1,2],[1,1,3],[1,0,4],[0,0,1]]],\"spatialReference\":{\"wkid\":4326}}";
polygon = PolygonBuilderEx.FromJson(json);

// extrude between z values to create a multipatch
multipatch = GeometryEngine.Instance.ConstructMultipatchExtrudeFromToZ(polygon, -10, 20);

// extrude along the axis defined by the coordinate to create a multipatch
Coordinate3D coord = new Coordinate3D(10, 18, -10);
multipatch = GeometryEngine.Instance.ConstructMultipatchExtrudeAlongVector3D(polygon, coord);

// build a polyline
json = "{\"hasZ\":true,\"paths\":[[[400,800,1000],[800,1400,1500],[1200,800,2000],[1800,1800,2500],[2200,800,3000]]],\"spatialReference\":{\"wkid\":3857}}";
Polyline polyline = PolylineBuilderEx.FromJson(json);

// extrude to a specific z value to create a multipatch
multipatch = GeometryEngine.Instance.ConstructMultipatchExtrudeToZ(polyline, 500);

Coordinate3D fromCoord = new Coordinate3D(50, 50, -500);
Coordinate3D toCoord = new Coordinate3D(200, 50, 1000);

// extrude between two coordinates to create a multipatch
multipatch = GeometryEngine.Instance.ConstructMultipatchExtrudeAlongLine(polyline, fromCoord, toCoord);

Multipatch Properties

// standard geometry properties
bool hasZ = multipatch.HasZ;
bool hasM = multipatch.HasM;
bool hasID = multipatch.HasID;
bool isEmpty = multipatch.IsEmpty;
var sr = multipatch.SpatialReference;

// number of patches (parts)
int patchCount = multiPatch.PartCount;
// number of points
int pointCount = multiPatch.PointCount;

// retrieve the points as MapPoints
ReadOnlyPointCollection points = multipatch.Points;
// or as 3D Coordinates
IReadOnlyList<Coordinate3D> coordinates = multipatch.Copy3DCoordinatesToList();


// multipatch materials
bool hasMaterials = multiPatch.HasMaterials;
int materialCount = multiPatch.MaterialCount;


// multipatch textures
bool hasTextures = multiPatch.HasTextures;
int textureVertexCount = multiPatch.TextureVertexCount;

// normals
bool hasNormals = multiPatch.HasNormals;


// properties for an individual patch (if multipatch.PartCount > 0)
int patchPriority = multiPatch.GetPatchPriority(patchIndex);
PatchType patchType = multiPatch.GetPatchType(patchIndex);

// patch points
int patchPointCount = multiPatch.GetPatchPointCount(patchIndex);
int pointStartIndex = multiPatch.GetPatchStartPointIndex(patchIndex);
// the patch Points are then the points in multipatch.Points from pointStartIndex to pointStartIndex + patchPointCount 

// if the multipatch has materials 
if (hasMaterials)
{
  // does the patch have a material?  
  //   materialIndex = -1 if the patch does not have a material; 
  //   0 <= materialIndex < materialCount if the patch does have materials
  int materialIndex = multipatch.GetPatchMaterialIndex(patchIndex);


  // properties for an individual material (if multipatch.MaterialCount > 0)
  var color = multipatch.GetMaterialColor(materialIndex);
  var edgeColor = multipatch.GetMaterialEdgeColor(materialIndex);
  var edgeWidth = multipatch.GetMaterialEdgeWidth(materialIndex);
  var shiness = multipatch.GetMaterialShininess(materialIndex);
  var percent = multipatch.GetMaterialTransparencyPercent(materialIndex);
  var cullBackFace = multipatch.IsMaterialCullBackFace(materialIndex);

  // texture properties
  bool isTextured = multipatch.IsMaterialTextured(materialIndex);
  if (isTextured)
  {
    int columnCount = multipatch.GetMaterialTextureColumnCount(materialIndex);
    int rowCount = multipatch.GetMaterialTextureRowCount(materialIndex);
    int bpp = multipatch.GetMaterialTextureBytesPerPixel(materialIndex);
    TextureCompressionType compressionType = multipatch.GetMaterialTextureCompressionType(materialIndex);
    var texture = multipatch.GetMaterialTexture(materialIndex);
  }
}

// texture coordinates (if multipatch.HasTextures = true)
if (hasTextures)
{
  int numPatchTexturePoints = multiPatch.GetPatchTextureVertexCount(patchIndex);
  var coordinate2D = multiPatch.GetPatchTextureCoordinate(patchIndex, 0);

  ICollection<Coordinate2D> textureCoordinates = new List<Coordinate2D>(numPatchTexturePoints);
  multiPatch.GetPatchTextureCoordinates(patchIndex, ref textureCoordinates);
}


// patch normals (if multipatch.HasNormals = true)
if (hasNormals)
{
  //  number of normal coordinates = multipatch.GetPatchPointCount(patchIndex)
  Coordinate3D patchNormal = multipatch.GetPatchNormal(patchIndex, 0);
  ICollection<Coordinate3D> normalCoordinates = new List<Coordinate3D>(patchPointCount);
  multipatch.GetPatchNormals(patchIndex, ref normalCoordinates);
}

Construct Multipatch

// export to binary xml
string binaryXml = multiPatch.ToBinaryXml();

// import from binaryXML - methods need to run on the MCT
Multipatch binaryMultipatch = MultipatchBuilderEx.FromBinaryXml(binaryXml);

// xml export / import
string xml = multiPatch.ToXml();
Multipatch xmlMultipatch = MultipatchBuilderEx.FromXml(xml);

// esriShape export/import
byte[] buffer = multiPatch.ToEsriShape();
Multipatch esriPatch = MultipatchBuilderEx.FromEsriShape(buffer);

// or use GeometryEngine
Multipatch patchImport = GeometryEngine.Instance.ImportFromEsriShape(EsriShapeImportFlags.EsriShapeImportDefaults, buffer, multiPatch.SpatialReference) as Multipatch;

Construct Multipatch via MultipatchBuilderEx

var coords_face1 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495461061000071,41.902603910000039,62.552700000000186),
  new Coordinate3D(12.495461061000071,41.902603910000039,59.504700000004959),
  new Coordinate3D(12.495461061000071,41.902576344000067,59.504700000004959),
  new Coordinate3D(12.495461061000071,41.902603910000039,62.552700000000186),
  new Coordinate3D(12.495461061000071,41.902576344000067,59.504700000004959),
  new Coordinate3D(12.495461061000071,41.902576344000067,62.552700000000186),
};

var coords_face2 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
};

var coords_face3 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
};

var coords_face4 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
};

var coords_face5 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
};

var coords_face6 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
};

// materials
var materialRed = new BasicMaterial();
materialRed.Color = System.Windows.Media.Colors.Red;

var materialTransparent = new BasicMaterial();
materialTransparent.Color = System.Windows.Media.Colors.White;
materialTransparent.TransparencyPercent = 80;

var blueTransparent = new BasicMaterial(materialTransparent);
blueTransparent.Color = System.Windows.Media.Colors.SkyBlue;

// create a list of patch objects
var patches = new List<Patch>();

// create the multipatchBuilderEx object
var mpb = new ArcGIS.Core.Geometry.MultipatchBuilderEx();

// make each patch using the appropriate coordinates and add to the patch list
var patch = mpb.MakePatch(PatchType.Triangles);
patch.Coords = coords_face1;
patches.Add(patch);

patch = mpb.MakePatch(PatchType.Triangles);
patch.Coords = coords_face2;
patches.Add(patch);

patch = mpb.MakePatch(PatchType.Triangles);
patch.Coords = coords_face3;
patches.Add(patch);

patch = mpb.MakePatch(PatchType.Triangles);
patch.Coords = coords_face4;
patches.Add(patch);

patch = mpb.MakePatch(PatchType.Triangles);
patch.Coords = coords_face5;
patches.Add(patch);

patch = mpb.MakePatch(PatchType.Triangles);
patch.Coords = coords_face6;
patches.Add(patch);

patches[0].Material = materialRed;
patches[1].Material = materialTransparent;
patches[2].Material = materialRed;
patches[3].Material = materialRed;
patches[4].Material = materialRed;
patches[5].Material = blueTransparent;

// assign the patches to the multipatchBuilder
mpb.Patches = patches;

// check which patches currently contain the material
var red = mpb.QueryPatchIndicesWithMaterial(materialRed);
//   red should be [0, 2, 3, 4]


// call ToGeometry to get the multipatch
multipatch = mpb.ToGeometry() as Multipatch;

Construct Multipatch from another Multipatch

// create the multipatchBuilderEx object
var builder = new ArcGIS.Core.Geometry.MultipatchBuilderEx(multipatch);

// check some properties
bool hasM = builder.HasM;
bool hasZ = builder.HasZ;
bool hasID = builder.HasID;
bool isEmpty = builder.IsEmpty;
bool hasNormals = builder.HasNormals;

var patches = builder.Patches;
int patchCount = patches.Count;

// if there's some patches
if (patchCount > 0)
{
  int pointCount = builder.GetPatchPointCount(0);

  // replace the first point in the first patch
  if (pointCount > 0)
  {
    // get the first point
    var pt = builder.GetPoint(0, 0);
    builder.SetPoint(0, 0, newPoint);
  }

  // check which patches currently contain the texture
  var texture = builder.QueryPatchIndicesWithTexture(brickTextureResource);

  // assign a texture material
  patches[0].Material = brickMaterialTexture;
}

// update the builder for M awareness
builder.HasM = true;
// synchronize the patch attributes to match the builder attributes
//   in this instance because we just set HasM to true on the builder, each patch will now get a default M value for it's set of coordinates
builder.SynchronizeAttributeAwareness();

// call ToGeometry to get the multipatch
multipatch = builder.ToGeometry() as Multipatch;

// multipatch.HasM will be true

Construct Multipatch from a 3D model file

try
{
  var model = ArcGIS.Core.Geometry.MultipatchBuilderEx.From3DModelFile(@"c:\Temp\My3dModelFile.dae");
  bool modelIsEmpty = model.IsEmpty;
}
catch (FileNotFoundException)
{
  // file not found
}
catch (ArgumentException)
{
  // File extension is unsupported or cannot read the file
}

Construct 3D special Multipatch shapes

var sr = MapView.Active.Map.SpatialReference;

var extent = MapView.Active.Extent;
var center = extent.Center;
var centerZ = MapPointBuilderEx.CreateMapPoint(center.X, center.Y, 500, sr);

// cube
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Cube, centerZ, 200, sr);
// tetrahedron
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Tetrahedron, centerZ, 200, sr);
// diamond
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Diamond, centerZ, 200, sr);
// hexagon
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Hexagon, centerZ, 200, sr);

// sphere frame
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.SphereFrame, centerZ, 200, 0.8, sr);
// sphere
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Sphere, centerZ, 200, 0.8, sr);
// cylinder
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Cylinder, centerZ, 200, 0.8, sr);
// cone
multipatch = ArcGIS.Core.Geometry.MultipatchBuilderEx.CreateMultipatch(MultipatchConstructType.Cone, centerZ, 200, 0.8, sr);


// use the builder to add materials or textures
//   - create a cone with a material
builder = new MultipatchBuilderEx(MultipatchConstructType.Cone, centerZ, 200, 0.8, sr);

BasicMaterial faceMaterial = new BasicMaterial();
faceMaterial.Color = System.Windows.Media.Color.FromRgb(255, 0, 0);
faceMaterial.Shininess = 150;
faceMaterial.TransparencyPercent = 50;
faceMaterial.EdgeWidth = 20;

foreach (var patch in builder.Patches)
  patch.Material = faceMaterial;

multipatch = builder.ToGeometry() as Multipatch;

Create BasicMaterial

// Create BasicMaterial with default values
BasicMaterial material = new BasicMaterial();
System.Windows.Media.Color color = material.Color;         // color = Colors.Black
System.Windows.Media.Color edgeColor = material.EdgeColor; // edgeColor = Colors.Black
int edgeWidth = material.EdgeWidth;                        // edgeWidth = 0
int transparency = material.TransparencyPercent;           // transparency = 0
int shininess = material.Shininess;                        // shininess = 0
bool cullBackFace = material.IsCullBackFace;               // cullBackFace = false

// Modify the properties
material.Color = System.Windows.Media.Colors.Red;
material.EdgeColor = System.Windows.Media.Colors.Blue;
material.EdgeWidth = 10;
material.TransparencyPercent = 50;
material.Shininess = 25;
material.IsCullBackFace = true;

Create BasicMaterial with JPEG texture

// read the jpeg into a buffer
//At 3.0 you need https://www.nuget.org/packages/Microsoft.Windows.Compatibility
//System.Drawing
System.Drawing.Image image = System.Drawing.Image.FromFile(@"C:\temp\myImageFile.jpg");
MemoryStream memoryStream = new MemoryStream();

System.Drawing.Imaging.ImageFormat format = System.Drawing.Imaging.ImageFormat.Jpeg;
image.Save(memoryStream, format);
byte[] imageBuffer = memoryStream.ToArray();

var jpgTexture = new JPEGTexture(imageBuffer);

// texture properties
int bpp = jpgTexture.BytesPerPixel;
int columnCount = jpgTexture.ColumnCount;
int rowCount = jpgTexture.RowCount;

// build the textureResource and the material
BasicMaterial material = new BasicMaterial();
material.TextureResource = new TextureResource(jpgTexture);

Create BasicMaterial with Uncompressed texture

UncompressedTexture uncompressedTexture1 = new UncompressedTexture(new byte[10 * 12 * 3], 10, 12, 3);

// texture properties
int bpp = uncompressedTexture1.BytesPerPixel;
int columnCount = uncompressedTexture1.ColumnCount;
int rowCount = uncompressedTexture1.RowCount;

// build the textureResource and the material
TextureResource tr = new TextureResource(uncompressedTexture1);
BasicMaterial material = new BasicMaterial();
material.TextureResource = tr;

Get the texture image of a multipatch

// <summary>
// This method gets the material texture image of a multipatch.
// </summary>
// <param name="multipatch">The input multipatch.</param>
// <param name="patchIndex">The index of the patch (part) for which to get the material texture.</param>
public void GetMultipatchTextureImage(Multipatch multipatch, int patchIndex)
{
  int materialIndex = multipatch.GetPatchMaterialIndex(patchIndex);
  if (!multipatch.IsMaterialTextured(materialIndex))
    return;

  TextureCompressionType compressionType = 
    multipatch.GetMaterialTextureCompressionType(materialIndex);

  string ext = compressionType == TextureCompressionType.CompressionJPEG ? ".jpg" : ".dat";
  byte[] textureBuffer = multipatch.GetMaterialTexture(materialIndex);

  Stream imageStream = new MemoryStream(textureBuffer);
  System.Drawing.Image image = System.Drawing.Image.FromStream(imageStream);
  image.Save(@"C:\temp\myImage" + ext);
}

Get the normal coordinate of a multipatch

// <summary>
// This method gets the normal coordinate of a multipatch and does something with it.
// </summary>
// <param name="multipatch">The input multipatch.</param>
// <param name="patchIndex">The index of the patch (part) for which to get the normal.</param>
public void DoSomethingWithNormalCoordinate(Multipatch multipatch, int patchIndex)
{
  if (multipatch.HasNormals)
  {
    // If the multipatch has normals, then the number of normals is equal to the number of points.
    int numNormals = multipatch.GetPatchPointCount(patchIndex);

    for (int pointIndex = 0; pointIndex < numNormals; pointIndex++)
    {
      Coordinate3D normal = multipatch.GetPatchNormal(patchIndex, pointIndex);

      // Do something with the normal coordinate.
    }
  }
}

Get the normals of a multipatch

// <summary>
// This method gets the normal coordinate of a multipatch and does something with it.
// </summary>
// <param name="multipatch">The input multipatch.</param>
public void DoSomethingWithNormalCoordinates(Multipatch multipatch)
{
  if (multipatch.HasNormals)
  {
    // Allocate the list only once
    int numPoints = multipatch.PointCount;
    ICollection<Coordinate3D> normals = new List<Coordinate3D>(numPoints);

    // The parts of a multipatch are also called patches
    int numPatches = multipatch.PartCount;

    for (int patchIndex = 0; patchIndex < numPatches; patchIndex++)
    {
      multipatch.GetPatchNormals(patchIndex, ref normals);

      // Do something with the normals for this patch.
    }
  }
}

Get the material properties of a multipatch

public void GetMaterialProperties(Multipatch multipatch, int patchIndex)
{
  if (multipatch.HasMaterials)
  {
    // Get the material index for the specified patch.
    int materialIndex = multipatch.GetPatchMaterialIndex(patchIndex);

    System.Windows.Media.Color color = multipatch.GetMaterialColor(materialIndex);
    int tranparencyPercent = multipatch.GetMaterialTransparencyPercent(materialIndex);
    bool isBackCulled = multipatch.IsMaterialCullBackFace(materialIndex);

    if (multipatch.IsMaterialTextured(materialIndex))
    {
      int bpp = multipatch.GetMaterialTextureBytesPerPixel(materialIndex);
      int columnCount = multipatch.GetMaterialTextureColumnCount(materialIndex);
      int rowCount = multipatch.GetMaterialTextureRowCount(materialIndex);
    }
  }
}

Multiparts

Get the individual parts of a multipart feature

public IEnumerable<Geometry> MultipartToSinglePart(Geometry inputGeometry)
{
  // list holding the part(s) of the input geometry
  List<Geometry> singleParts = new List<Geometry>();

  // check if the input is a null pointer or if the geometry is empty
  if (inputGeometry == null || inputGeometry.IsEmpty)
    return singleParts;

  // based on the type of geometry, take the parts/points and add them individually into a list
  switch (inputGeometry.GeometryType)
  {
    case GeometryType.Envelope:
      singleParts.Add(inputGeometry.Clone() as Envelope);
      break;
    case GeometryType.Multipatch:
      singleParts.Add(inputGeometry.Clone() as Multipatch);
      break;
    case GeometryType.Multipoint:
      var multiPoint = inputGeometry as Multipoint;

      foreach (var point in multiPoint.Points)
      {
        // add each point of collection as a standalone point into the list
        singleParts.Add(point);
      }
      break;
    case GeometryType.Point:
      singleParts.Add(inputGeometry.Clone() as MapPoint);
      break;
    case GeometryType.Polygon:
      var polygon = inputGeometry as Polygon;

      foreach (var polygonPart in polygon.Parts)
      {
        // use the PolygonBuilderEx turning the segments into a standalone 
        // polygon instance
        singleParts.Add(PolygonBuilderEx.CreatePolygon(polygonPart));
      }
      break;
    case GeometryType.Polyline:
      var polyline = inputGeometry as Polyline;

      foreach (var polylinePart in polyline.Parts)
      {
        // use the PolylineBuilderEx turning the segments into a standalone
        // polyline instance
        singleParts.Add(PolylineBuilderEx.CreatePolyline(polylinePart));
      }
      break;
    case GeometryType.Unknown:
      break;
    default:
      break;
  }

  return singleParts;
}

Get the outermost rings of a polygon

public Polygon GetOutermostRings(Polygon inputPolygon)
{
  if (inputPolygon == null || inputPolygon.IsEmpty)
    return null;

  List<Polygon> internalRings = new List<Polygon>();

  // explode the parts of the polygon into a list of individual geometries
  // see the "Get the individual parts of a multipart feature"
  // snippet for MultipartToSinglePart
  var parts = MultipartToSinglePart(inputPolygon);

  // get an enumeration of clockwise geometries (area > 0) ordered by the area
  var clockwiseParts = parts.Where(geom => ((Polygon)geom).Area > 0)
                        .OrderByDescending(geom => ((Polygon)geom).Area);

  // for each of the exterior rings
  foreach (var part in clockwiseParts)
  {
    // add the first (the largest) ring into the internal collection
    if (internalRings.Count == 0)
      internalRings.Add(part as Polygon);

    // use flag to indicate if current part is within the already selection polygons
    bool isWithin = false;

    foreach (var item in internalRings)
    {
      if (GeometryEngine.Instance.Within(part, item))
        isWithin = true;
    }

    // if the current polygon is not within any polygon of the internal collection
    // then it is disjoint and needs to be added to 
    if (isWithin == false)
      internalRings.Add(part as Polygon);
  }

  PolygonBuilderEx outerRings = new PolygonBuilderEx();
  // now assemble a new polygon geometry based on the internal polygon collection
  foreach (var ring in internalRings)
  {
    outerRings.AddParts(ring.Parts);
  }

  // return the final geometry of the outer rings
  return outerRings.ToGeometry();
}

Retrieve Geometry from Geodatabase

Retrieve Geometry from Geodatabase

// methods need to run on the MCT
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  try
  {
    // open a gdb
    using (ArcGIS.Core.Data.Geodatabase gdb = 
              new ArcGIS.Core.Data.Geodatabase(
                  new FileGeodatabaseConnectionPath(new Uri(@"c:\Temp\MyDatabase.gdb"))))
    {
      //Open a featureClass 
      using (ArcGIS.Core.Data.FeatureClass featureClass = 
                     gdb.OpenDataset<ArcGIS.Core.Data.FeatureClass>("Polygon"))
      {
        
        ArcGIS.Core.Data.QueryFilter filter = 
                   new ArcGIS.Core.Data.QueryFilter()
                    {
                      WhereClause = "OBJECTID = 6"
                    };

        // get the row
        using (ArcGIS.Core.Data.RowCursor rowCursor = 
                               featureClass.Search(filter, false))
        {
          while (rowCursor.MoveNext())
          {
            using (var row = rowCursor.Current)
            {
              long oid = row.GetObjectID();

              // get the shape from the row
              ArcGIS.Core.Data.Feature feature = row as ArcGIS.Core.Data.Feature;
              Polygon polygon = feature.GetShape() as Polygon;

              // do something here
            }
          }
        }
      }
    }
  }
  catch (Exception ex)
  {
    // error - handle appropriately
  }
});

Import, Export Geometries

Import and Export Geometries to well-known Text

// create a point with z, m
MapPoint point = MapPointBuilderEx.CreateMapPoint(
         100, 200, 300, 400, SpatialReferences.WebMercator);

// set the flags
WktExportFlags wktExportFlags = WktExportFlags.WktExportDefaults;
WktImportFlags wktImportFlags = WktImportFlags.WktImportDefaults;

// export and import
string wktString = GeometryEngine.Instance.ExportToWKT(wktExportFlags, point);
MapPoint importPoint = GeometryEngine.Instance.ImportFromWKT(
      wktImportFlags, wktString, SpatialReferences.WebMercator) as MapPoint;

double x = importPoint.X;       // x = 100
double y = importPoint.Y;       // y = 200
bool hasZ = importPoint.HasZ;   // hasZ = true
double z = importPoint.Z;       // z = 300
bool hasM = importPoint.HasM;   // hasM = true
double m = importPoint.M;       // m = 400

// export without z
WktExportFlags exportFlagsNoZ = WktExportFlags.WktExportStripZs;
wktString = GeometryEngine.Instance.ExportToWKT(exportFlagsNoZ, point);
importPoint = GeometryEngine.Instance.ImportFromWKT(
  wktImportFlags, wktString, SpatialReferences.WebMercator) as MapPoint;

x = importPoint.X;        // x = 100
y = importPoint.Y;        // y = 200
hasZ = importPoint.HasZ;  // hasZ = false
z = importPoint.Z;        // z = 0
hasM = importPoint.HasM;  // hasM = true
m = importPoint.M;        // m = 400

// export without m
WktExportFlags exportFlagsNoM = WktExportFlags.WktExportStripMs;
wktString = GeometryEngine.Instance.ExportToWKT(exportFlagsNoM, point);
importPoint = GeometryEngine.Instance.ImportFromWKT(
  wktImportFlags, wktString, SpatialReferences.WebMercator) as MapPoint;

x = importPoint.X;        // x = 100
y = importPoint.Y;        // y = 200
hasZ = importPoint.HasZ;  // hasZ = true
z = importPoint.Z;        // z = 300
hasM = importPoint.HasM;  // hasM = false
m = importPoint.M;        // m = Nan

// export without z, m
wktString = GeometryEngine.Instance.ExportToWKT(
  exportFlagsNoZ | exportFlagsNoM, point);
importPoint = GeometryEngine.Instance.ImportFromWKT(
  wktImportFlags, wktString, SpatialReferences.WebMercator) as MapPoint;

x = importPoint.X;        // x = 100
y = importPoint.Y;        // y = 200
hasZ = importPoint.HasZ;  // hasZ = false
z = importPoint.Z;        // z = 0
hasM = importPoint.HasM;  // hasM = false
m = importPoint.M;        // m = Nan

Import and Export Geometries to well-known Binary

// create a polyline
List<Coordinate2D> coords = new List<Coordinate2D>
{
  new Coordinate2D(0, 0),
  new Coordinate2D(0, 1),
  new Coordinate2D(1, 1),
  new Coordinate2D(1, 0)
};

Polyline polyline = PolylineBuilderEx.CreatePolyline(
            coords, SpatialReferences.WGS84);

WkbExportFlags wkbExportFlags = WkbExportFlags.WkbExportDefaults;
WkbImportFlags wkbImportFlags = WkbImportFlags.WkbImportDefaults;

// export and import
byte[] buffer = GeometryEngine.Instance.ExportToWKB(wkbExportFlags, polyline);
Geometry geometry = GeometryEngine.Instance.ImportFromWKB(
               wkbImportFlags, buffer, SpatialReferences.WGS84);
Polyline importPolyline = geometry as Polyline;


// alternatively, determine the size for the buffer
int bufferSize = GeometryEngine.Instance.GetWKBSize(wkbExportFlags, polyline);
buffer = new byte[bufferSize];
// export
bufferSize = GeometryEngine.Instance.ExportToWKB(
                wkbExportFlags, polyline, ref buffer);
// import
importPolyline = GeometryEngine.Instance.ImportFromWKB(
         wkbImportFlags, buffer, SpatialReferences.WGS84) as Polyline;

Import and Export Geometries to EsriShape

// create an envelope
List<MapPoint> coordsZM = new List<MapPoint>
{
  MapPointBuilderEx.CreateMapPoint(1001, 1002, 1003, 1004),
  MapPointBuilderEx.CreateMapPoint(2001, 2002, Double.NaN, 2004),
  MapPointBuilderEx.CreateMapPoint(3001, -3002, 3003, 3004),
  MapPointBuilderEx.CreateMapPoint(1001, -4002, 4003, 4004)
};

Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(
           coordsZM[0], coordsZM[2], SpatialReferences.WGS84);

// export and import
EsriShapeExportFlags exportFlags = EsriShapeExportFlags.EsriShapeExportDefaults;
EsriShapeImportFlags importFlags = EsriShapeImportFlags.EsriShapeImportDefaults;
byte[] buffer = GeometryEngine.Instance.ExportToEsriShape(exportFlags, envelope);
Polygon importedPolygon = GeometryEngine.Instance.ImportFromEsriShape(
               importFlags, buffer, envelope.SpatialReference) as Polygon;
Envelope importedEnvelope = importedPolygon.Extent;

// export without z,m
buffer = GeometryEngine.Instance.ExportToEsriShape(
        EsriShapeExportFlags.EsriShapeExportStripZs | 
        EsriShapeExportFlags.EsriShapeExportStripMs, envelope);
importedPolygon = GeometryEngine.Instance.ImportFromEsriShape(
        importFlags, buffer, SpatialReferences.WGS84) as Polygon;
importedEnvelope = importedPolygon.Extent;

bool hasZ = importedEnvelope.HasZ;      // hasZ = false
bool hasM = importedEnvelope.HasM;      // hasM = false

// export with shapeSize
int bufferSize = GeometryEngine.Instance.GetEsriShapeSize(
                                       exportFlags, envelope);
buffer = new byte[bufferSize];

bufferSize = GeometryEngine.Instance.ExportToEsriShape(
                             exportFlags, envelope, ref buffer);
importedPolygon = GeometryEngine.Instance.ImportFromEsriShape(
                    importFlags, buffer, envelope.SpatialReference) as Polygon;
importedEnvelope = importedPolygon.Extent;


// or use the envelope and envelopeBuilderEx classes
buffer = envelope.ToEsriShape();
// buffer represents a polygon as there is not an envelope Esri shape buffer
// EnvelopeBuilderEx.FromEsriShape takes a polygon Esri shape buffer and returns the extent of the polygon.
importedEnvelope = EnvelopeBuilderEx.FromEsriShape(buffer);

Import and Export Geometries to JSON

// MapPoint
string inputString = 
  "{\"x\":1,\"y\":2,\"spatialReference\":{\"wkid\":4326,\"latestWkid\":4326}}";
Geometry geometry = GeometryEngine.Instance.ImportFromJson(
  JsonImportFlags.JsonImportDefaults, inputString);

MapPoint importPoint = geometry as MapPoint;
// importPoint = 1, 2
// importPoint.SpatialReference.WKid = 4326

// use the MapPointBuilderEx convenience method
MapPoint importPoint2 = MapPointBuilderEx.FromJson(inputString);
// importPoint2 = 1, 2
// impointPoint2.SpatialReference.Wkid = 4326

string outputString = GeometryEngine.Instance.ExportToJson(
  JsonExportFlags.JsonExportDefaults, importPoint);
// outputString =
//   "{\"x\":1,\"y\":2,\"spatialReference\":{\"wkid\":4326,\"latestWkid\":4326}}"

string outputString2 = importPoint.ToJson();

inputString = 
  "{\"spatialReference\":{\"wkid\":4326},\"z\":3,\"m\":4,\"x\":1,\"y\":2}";
importPoint = GeometryEngine.Instance.ImportFromJson(
  JsonImportFlags.JsonImportDefaults, inputString) as MapPoint;
// importPoint.HasM = true
// importPoint.HasZ = true
// importPoint.X = 1
// importPoint.Y = 2
// importPoint.M = 4
// importPoint.Z = 3

importPoint2 = MapPointBuilderEx.FromJson(inputString);

// export to json - skip spatial reference
outputString = GeometryEngine.Instance.ExportToJson(
              JsonExportFlags.JsonExportSkipCRS, importPoint);
// outputString = "{\"x\":1,\"y\":2,\"z\":3,\"m\":4}"

// export from mappoint, skipping the sr - same as GeometryEngine.Instance.ExportToJson w JsonExportFlags.JsonExportSkipCRS
outputString2 = importPoint.ToJson(true);

//
// Multipoint
//
List<Coordinate2D> coords = new List<Coordinate2D>()
{
  new Coordinate2D(100, 200),
  new Coordinate2D(201, 300),
  new Coordinate2D(301, 400),
  new Coordinate2D(401, 500)
};

Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(
  coords, SpatialReferences.WebMercator);

inputString = 
  "{\"points\":[[100,200],[201,300],[301,400],[401,500]],\"spatialReference\":{\"wkid\":3857}}";
Multipoint importMultipoint = 
  GeometryEngine.Instance.ImportFromJson(
         JsonImportFlags.JsonImportDefaults, inputString) as Multipoint;
// importMultipoint.IsEqual(multipoint) = true

ReadOnlyPointCollection points = importMultipoint.Points;
// points.Count = 4
// points[0] = 100, 200
// points[1] = 201, 300
// points[2] = 301, 400
// points[3] = 401, 500

// use the MultipointbuilderEx convenience method
Multipoint importMultipoint2 = MultipointBuilderEx.FromJson(inputString);
// importMultipoint2.IsEqual(multipoint) = true

// export to json
outputString = GeometryEngine.Instance.ExportToJson(
                JsonExportFlags.JsonExportDefaults, multipoint);
// outputString = inputString

// or use the multipoint itself
outputString2 = multipoint.ToJson();

//
// Polyline
//
Polyline polyline = PolylineBuilderEx.CreatePolyline(
                         coords, SpatialReferences.WebMercator);

// export without the spatial reference
outputString = GeometryEngine.Instance.ExportToJson(
                        JsonExportFlags.JsonExportSkipCRS, polyline);
// import
geometry = GeometryEngine.Instance.ImportFromJson(
             JsonImportFlags.JsonImportDefaults, outputString);
Polyline importPolyline = geometry as Polyline;
// importPolyline.SpatialReference = null


points = importPolyline.Points;
// points.Count = 4
// points[0] = 100, 200
// points[1] = 201, 300
// points[2] = 301, 400
// points[3] = 401, 500

// use the polylineBuilderEx convenience method 
Polyline importPolyline2 = PolylineBuilderEx.FromJson(outputString);
// importPolyline2 = importPolyline

outputString2 = importPolyline2.ToJson();
// outputString2 = outputString

//
// Polygon
//
Polygon polygon = PolygonBuilderEx.CreatePolygon(
                              coords, SpatialReferences.WebMercator);

// export without the spatial reference
outputString = GeometryEngine.Instance.ExportToJson(
                          JsonExportFlags.JsonExportSkipCRS, polygon);
// import
geometry = GeometryEngine.Instance.ImportFromJson(
                     JsonImportFlags.JsonImportDefaults, outputString);

Polygon importPolygon = geometry as Polygon;
// importPolygon.SpatialReference = null
points = importPolygon.Points;
// points.Count = 5

// polygonBuilderEx convenience method
Polygon importPolyon2 = PolygonBuilderEx.FromJson(outputString);
// importPolygon2 = importPolygon

// export from the polygon
outputString2 = importPolyon2.ToJson(true);

// Empty polygon
polygon = PolygonBuilderEx.CreatePolygon(SpatialReferences.WebMercator);
outputString = GeometryEngine.Instance.ExportToJson(
                               JsonExportFlags.JsonExportDefaults, polygon);
importPolygon = GeometryEngine.Instance.ImportFromJson(
                    JsonImportFlags.JsonImportDefaults, outputString) as Polygon;

// importPolygon.IsEmpty = true
// importPolygon.SpatialReference.Wkid = 3857

Import and Export Geometries to XML

MapPoint minPoint = MapPointBuilderEx.CreateMapPoint(1, 1, 1, 1, 3);
MapPoint maxPoint = MapPointBuilderEx.CreateMapPoint(5, 5, 5);

// 
//  MapPoint
// 
string xml = minPoint.ToXml();
MapPoint minPointImport = MapPointBuilderEx.FromXml(xml);
// minPointImport = minPoint

//
// Envelope
//
Envelope envelopeWithID = EnvelopeBuilderEx.CreateEnvelope(minPoint, maxPoint);

// Envelopes don't have IDs
// envelopeWithID.HasID = false
// envelopeWithID.HasM = true
// envelopeWithID.HasZ = true

xml = envelopeWithID.ToXml();
Envelope envelopeImport = EnvelopeBuilderEx.FromXml(xml);

//
// Multipoint
//
List<MapPoint> list = new List<MapPoint>();
list.Add(minPoint);
list.Add(maxPoint);

Multipoint multiPoint = MultipointBuilderEx.CreateMultipoint(list);

xml = multiPoint.ToXml();
Multipoint multipointImport = MultipointBuilderEx.FromXml(xml);
// multipointImport.PointCount == 2
// multipointImport.HasID = true
// multipointImport.HasM = true
// multipointImport.HasZ= true

Transformations

Create Geographic Transformation

// create from wkid
GeographicTransformation gt1478 = 
  ArcGIS.Core.Geometry.GeographicTransformation.Create(1478);
string name = gt1478.Name;
string wkt = gt1478.Wkt;
int wkid = gt1478.Wkid;

// create from wkt
GeographicTransformation another_gt1478 = 
     ArcGIS.Core.Geometry.GeographicTransformation.Create(wkt);

// inverse
GeographicTransformation inverse_gt148 = 
               another_gt1478.GetInverse() as GeographicTransformation;
bool isForward = inverse_gt148.IsForward;

Create Composite Geographic Transformation

// Create singleton from wkid
CompositeGeographicTransformation cgt = 
    ArcGIS.Core.Geometry.CompositeGeographicTransformation.Create(108272);
int count = cgt.Count;    // count = 1

IList<GeographicTransformation> gts = cgt.Transformations 
                                as IList<GeographicTransformation>;
gts.Add(ArcGIS.Core.Geometry.GeographicTransformation.Create(1437, false));
count = cgt.Count;        // count = 2

// create from an enumeration
CompositeGeographicTransformation another_cgt = 
              ArcGIS.Core.Geometry.CompositeGeographicTransformation.Create(gts);
GeographicTransformation gt0 = another_cgt[0];
GeographicTransformation gt1 = another_cgt[1];

// get the inverse
CompositeGeographicTransformation inversed_cgt = another_cgt.GetInverse() as CompositeGeographicTransformation;
// inversed_cgt[0] is same as gt1
// inversed_cgt[1] is same as gt0

var wkt = gt0.Wkt;
// create from string 
CompositeGeographicTransformation third_cgt = 
   ArcGIS.Core.Geometry.CompositeGeographicTransformation.Create(wkt, gt0.IsForward);
count = third_cgt.Count;        // count = 1

// create from josn
string json = cgt.ToJson();
CompositeGeographicTransformation joson_cgt = 
  DatumTransformation.CreateFromJson(json) as CompositeGeographicTransformation;

Create Projection Transformation

// methods need to be on the MCT
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  SpatialReference sr4267 = SpatialReferenceBuilder.CreateSpatialReference(4267);
  SpatialReference sr4326 = SpatialReferences.WGS84;
  SpatialReference sr3857 = SpatialReferences.WebMercator;

  // Create transformation from  4267 -> 3857
  ProjectionTransformation projTransFromSRs = 
       ArcGIS.Core.Geometry.ProjectionTransformation.Create(sr4267, sr3857);

  // create an envelope
  Envelope env = EnvelopeBuilderEx.CreateEnvelope(
             new Coordinate2D(2, 2), new Coordinate2D(3, 3), sr4267);

  // Project with one geo transform 4267 -> 3857
  Envelope projectedEnvEx = GeometryEngine.Instance.ProjectEx(
                                 env, projTransFromSRs) as Envelope;

  // Create inverse transformation, 3857 -> 4267
  ProjectionTransformation projTransFromSRsInverse = 
      ArcGIS.Core.Geometry.ProjectionTransformation.Create(sr3857, sr4267);
  // Project the projected envelope back using the inverse transformation
  Envelope projectedEnvBack = 
         GeometryEngine.Instance.ProjectEx(
           projectedEnvEx, projTransFromSRsInverse) as Envelope;

  bool isEqual = env.IsEqual(projectedEnvBack);
});

Create HV Datum Transformation

// Create from wkid
HVDatumTransformation hv110018 = HVDatumTransformation.Create(110018);
int wkid = hv110018.Wkid;
bool isForward = hv110018.IsForward;    // isForward = true
string name = hv110018.Name;            // Name = WGS_1984_To_WGS_1984_EGM2008_1x1_Height

// Create from wkt
string wkt = hv110018.Wkt;
HVDatumTransformation hv110018FromWkt = HVDatumTransformation.Create(wkt);

// Get the inverse
HVDatumTransformation hv110018Inverse = 
   hv110018.GetInverse() as HVDatumTransformation;
// hv110018Inverse.IsForward = false

Create Composite HV Datum Transformation

HVDatumTransformation hv1 = HVDatumTransformation.Create(108034);
HVDatumTransformation hv2 = HVDatumTransformation.Create(108033, false);
List<HVDatumTransformation> hvs = new List<HVDatumTransformation>() { hv1, hv2 };

// create from enumeration
CompositeHVDatumTransformation compositehv = 
                CompositeHVDatumTransformation.Create(hvs);
int count = compositehv.Count;      // count = 2

List<HVDatumTransformation> transforms = 
               compositehv.Transformations as List<HVDatumTransformation>;
HVDatumTransformation tranform = transforms[0];
// transform.Wkid = 108034

// get inverse
CompositeHVDatumTransformation inverse_compositehv = 
       compositehv.GetInverse() as CompositeHVDatumTransformation;

// create from xml
string xml = compositehv.ToXml();
//At 2.x - CompositeHVDatumTransformation xml_compositehv =
//      CompositeHVDatumTransformation.CreateFromXML(xml);

var xml_compositehv = CompositeHVDatumTransformation.CreateFromXml(xml);

// create from json
string json = compositehv.ToJson();
CompositeHVDatumTransformation json_compositehv = 
    DatumTransformation.CreateFromJson(json) as CompositeHVDatumTransformation;

Determine Transformations

// methods need to run on the MCT
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  //
  // find the first transformation used between spatial references 4267 and 4326
  //
  SpatialReference sr4267 = 
       SpatialReferenceBuilder.CreateSpatialReference(4267);
  SpatialReference sr4326 = SpatialReferences.WGS84;

  List<ProjectionTransformation> transformations = 
         ProjectionTransformation.FindTransformations(sr4267, sr4326);
  // transformations.Count = 1
  ProjectionTransformation projTrans = transformations[0];
  CompositeGeographicTransformation compositeGT = 
       projTrans.Transformation as CompositeGeographicTransformation;
  GeographicTransformation gt = compositeGT[0];
  // gt.Wkid = 15851
  // gt.Name = "NAD_1927_To_WGS_1984_79_CONUS"
  // gt.IsForward = true


  //
  // find the first five transformation used between spatial references 4267 and 4326
  //
  transformations = ProjectionTransformation.FindTransformations(
                                     sr4267, sr4326, numResults: 5);
  // transformations.Count = 5
  projTrans = transformations[0];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 1
  // compositeGT[0].Wkid = 15851
  // compositeGT[0].Name = "NAD_1927_To_WGS_1984_79_CONUS"
  // compositeGT[0].IsForward = true

  projTrans = transformations[1];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 1
  // compositeGT[0].Wkid = 1173
  // compositeGT[0].Name = "NAD_1927_To_WGS_1984_4"
  // compositeGT[0].IsForward = true

  projTrans = transformations[2];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 1
  // compositeGT[0].Wkid = 1172
  // compositeGT[0].Name = "NAD_1927_To_WGS_1984_3"
  // compositeGT[0].IsForward = true

  projTrans = transformations[3];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 2
  // compositeGT[0].Wkid = 1241
  // compositeGT[0].Name = "NAD_1927_To_NAD_1983_NADCON"
  // compositeGT[0].IsForward = true

  // compositeGT[1].Wkid = 108190
  // compositeGT[1].Name = "WGS_1984_(ITRF00)_To_NAD_1983"
  // compositeGT[1].IsForward = false

  projTrans = transformations[4];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 2
  // compositeGT[0].Wkid = 1241
  // compositeGT[0].Name = "NAD_1927_To_NAD_1983_NADCON"
  // compositeGT[0].IsForward = true

  // compositeGT[1].Wkid = 1515
  // compositeGT[1].Name = "NAD_1983_To_WGS_1984_5"
  // compositeGT[1].IsForward = true


  //
  // find the first transformation used between spatial
  // references 4267 and 4326 within Alaska
  //

  // Alaska
  Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(-161, 61, -145, 69);
  transformations = ProjectionTransformation.FindTransformations(
                                              sr4267, sr4326, envelope);
  // transformations.Count = 1
  projTrans = transformations[0];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 2
  // compositeGT[0].Wkid = 1243
  // compositeGT[0].Name = "NAD_1927_To_NAD_1983_Alaska"
  // compositeGT[0].IsForward = true

  // compositeGT[1].Wkid = 108190
  // compositeGT[1].Name = "WGS_1984_(ITRF00)_To_NAD_1983"
  // compositeGT[1].IsForward = false


  //
  // find the first geographic transformation used between two spatial references with VCS  (use vertical = false)
  //
  SpatialReference inSR = 
                  SpatialReferenceBuilder.CreateSpatialReference(4269, 115702);
  SpatialReference outSR = 
                  SpatialReferenceBuilder.CreateSpatialReference(4326, 3855);

  // Even though each spatial reference has a VCS,
  // vertical = false should return geographic transformations.
  transformations = ProjectionTransformation.FindTransformations(inSR, outSR);
  // transformations.Count = 1
  projTrans = transformations[0];
  compositeGT = projTrans.Transformation as CompositeGeographicTransformation;
  // compositeGT.Count = 1
  // compositeGT[0].Wkid = 108190
  // compositeGT[0].Name = ""WGS_1984_(ITRF00)_To_NAD_1983"
  // compositeGT[0].IsForward = false

  //
  // find the first vertical transformation used between two spatial references with VCS  (use vertical = true)
  //

  transformations = 
            ProjectionTransformation.FindTransformations(
                                    inSR, outSR, vertical: true);
  // transformations.Count = 1
  projTrans = transformations[0];

  CompositeHVDatumTransformation compositeHV = 
          projTrans.Transformation as CompositeHVDatumTransformation;
  // compositeHV.Count = 2
  // compositeHV[0].Wkid = 1188
  // compositeHV[0].Name = "NAD_1983_To_WGS_1984_1"
  // compositeHV[0].IsForward = true

  // compositeHV[1].Wkid = 110019
  // compositeHV[1].Name = "WGS_1984_To_WGS_1984_EGM2008_2.5x2.5_Height"
  // compositeHV[1].IsForward = true
});

MapPoint GeoCoordinateString

MapPoint - GeoCoordinateString Conversion

SpatialReference sr = SpatialReferences.WGS84;
SpatialReference sr2 = SpatialReferences.WebMercator;

// create some points
MapPoint point0 = MapPointBuilderEx.CreateMapPoint(0, 0, sr);
MapPoint point1 = MapPointBuilderEx.CreateMapPoint(10, 20, sr);
MapPoint point2 = GeometryEngine.Instance.Project(point1, sr2) as MapPoint;
MapPoint pointEmpty = MapPointBuilderEx.CreateMapPoint(sr);
MapPoint pointwithNoSR = MapPointBuilderEx.CreateMapPoint(1, 1);
MapPoint pointZM = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, sr);

// convert to MGRS
ToGeoCoordinateParameter mgrsParam = 
         new ToGeoCoordinateParameter(GeoCoordinateType.MGRS);
// 31NAA6602100000
string geoCoordString = point0.ToGeoCoordinateString(mgrsParam);

// use the builder to create a new point from the string.
// Coordinates are the same 
// outPoint.x = 0; outPoint.Y = 0
MapPoint outPoint = 
      MapPointBuilderEx.FromGeoCoordinateString(
                geoCoordString, sr, GeoCoordinateType.MGRS);

// 32QPH0460911794
// outPoint.X = 10; outPoint.Y = 20
geoCoordString = point1.ToGeoCoordinateString(mgrsParam);             
outPoint = MapPointBuilderEx.FromGeoCoordinateString(
           geoCoordString, sr, GeoCoordinateType.MGRS);

// z, m are not transformed
// outPoint.X = 1; outPoint.Y = 2; outPoint.Z = Nan; outPoint.M = Nan;
geoCoordString = pointZM.ToGeoCoordinateString(mgrsParam);
outPoint = MapPointBuilderEx.FromGeoCoordinateString(
  geoCoordString, sr, GeoCoordinateType.MGRS);

// set the number of digits to 2 and convert
// 32QPH0512
// outPoint.X = 10; outPoint.Y = 20
mgrsParam.NumDigits = 2;
geoCoordString = point1.ToGeoCoordinateString(mgrsParam);             
outPoint = MapPointBuilderEx.FromGeoCoordinateString(
  geoCoordString, sr, GeoCoordinateType.MGRS);     


// convert to UTM
ToGeoCoordinateParameter utmParam = 
     new ToGeoCoordinateParameter(GeoCoordinateType.UTM);
// 31N 166021 0000000
geoCoordString = point0.ToGeoCoordinateString(utmParam);
// 32Q 604609 2211793
geoCoordString = point1.ToGeoCoordinateString(utmParam);        

// convert to DMS
ToGeoCoordinateParameter dmsParam = 
  new ToGeoCoordinateParameter(GeoCoordinateType.DMS);
// 00 00 00.00N 000 00 00.00E
geoCoordString = point0.ToGeoCoordinateString(dmsParam);
// 20 00 00.00N 010 00 00.00E
geoCoordString = point1.ToGeoCoordinateString(dmsParam);        

// convert to DDM
ToGeoCoordinateParameter ddmParam = 
  new ToGeoCoordinateParameter(GeoCoordinateType.DDM);
// 00 00.0000N 000 00.0000E
geoCoordString = point0.ToGeoCoordinateString(ddmParam);
// 20 00.0000N 010 00.0000E
geoCoordString = point1.ToGeoCoordinateString(ddmParam);        

// convert to DD
ToGeoCoordinateParameter ddParam = 
  new ToGeoCoordinateParameter(GeoCoordinateType.DD);
// 00.000000N 000.000000E
geoCoordString = point0.ToGeoCoordinateString(ddParam);
// 20.000000N 010.000000E
geoCoordString = point1.ToGeoCoordinateString(ddParam);       

AngularUnit

AngularUnit - Convert between degrees and radians

// convert 45 degrees to radians
double radians = AngularUnit.Degrees.ConvertToRadians(45);

// convert PI to degrees
double degrees = AngularUnit.Degrees.ConvertFromRadians(Math.PI);

AngularUnit - Create an AngularUnit with a factory code

try
{
  // create a Grad unit
  var grad = AngularUnit.CreateAngularUnit(9105);
  string unitName = grad.Name;                        // Grad
  double conversionFactor = grad.ConversionFactor;    // 0.015708
  double radiansPerUnit = grad.RadiansPerUnit;
  int factoryCode = grad.FactoryCode;                 // 9105

  // convert 10 grads to degrees
  double val = grad.ConvertTo(10, AngularUnit.Degrees);

  // convert 10 radians to grads
  val = grad.ConvertFromRadians(10);
}
catch (ArgumentException)
{
  // ArgumentException will be thrown by CreateAngularUnit in
  // the following scenarios:
  // - if the factory code used is a non-angular factory code
  //   (i.e. it corresponds to square meters which is an area unit code)
  // - if the factory code used is invalid
  //   (i.e. it is negative or doesn't correspond to any factory code)
}

AngularUnit - Create a Custom AngularUnit

// custom unit - 3 radians per unit
var myAngularUnit = AngularUnit.CreateAngularUnit("myCustomAngularUnit", 3);
string Name = myAngularUnit.Name;                   // myCustomAngularUnit
double Factor = myAngularUnit.ConversionFactor;     // 3
int Code = myAngularUnit.FactoryCode;               // 0 because it is a custom angular unit
double radiansUnit = myAngularUnit.RadiansPerUnit;  // 3

// convert 10 degrees to my unit
double converted = AngularUnit.Degrees.ConvertTo(10, myAngularUnit);
// convert it back to degrees
converted = myAngularUnit.ConvertTo(converted, AngularUnit.Degrees);

// convert 1 radian into my angular units
converted = myAngularUnit.ConvertFromRadians(1);

// get the wkt
string wkt = myAngularUnit.Wkt;

// create an angular unit from this wkt
var anotherAngularUnit = AngularUnit.CreateAngularUnit(wkt);
// anotherAngularUnit.ConversionFactor = 3
// anotherAngularUnit.FactoryCode = 0    
// anotherAngularUnit.RadiansPerUnit = 3

LinearUnit

LinearUnit - Convert between feet and meters

// convert 10 feet to meters
double metres = LinearUnit.Feet.ConvertToMeters(10);

// convert 20 meters to feet
double feet = LinearUnit.Feet.ConvertFromMeters(20.0);

LinearUnit - Convert between centimeters and millimeters

// convert 11 centimeters to millimeters
double mm = LinearUnit.Centimeters.ConvertTo(11, LinearUnit.Millimeters);

// convert the result back to centimeters
double cm = LinearUnit.Millimeters.ConvertTo(mm, LinearUnit.Centimeters);

// convert the millimeter result back to meters
double meters = LinearUnit.Millimeters.ConvertToMeters(mm);

LinearUnit - Create a LinearUnit with a factory code

try
{
  // create a british 1936 foot
  var britFoot = LinearUnit.CreateLinearUnit(9095);
  string unitName = britFoot.Name;                        //  "Foot_British_1936"
  double conversionFactor = britFoot.ConversionFactor;    // 0.3048007491
  double metersPerUnit = britFoot.MetersPerUnit;
  int factoryCode = britFoot.FactoryCode;                 // 9095

  // convert 10 british 1936 feet to centimeters
  double val = britFoot.ConvertTo(10, LinearUnit.Centimeters);

  // convert 10 m to british 1936 feet
  val = britFoot.ConvertFromMeters(10);
}
catch (ArgumentException)
{
  // ArgumentException will be thrown by CreateLinearUnit
  // in the following scenarios:
  // - if the factory code used is a non-linear factory code
  //   (i.e. it corresponds to square meters which is an area unit code)
  // - if the factory code used is invalid
  //   (i.e. it is negative or doesn't correspond to any factory code)
}

LinearUnit - Create a Custom LinearUnit

// create a custom linear unit - there are 0.33 meters per myLinearUnit
var myLinearUnit = LinearUnit.CreateLinearUnit("myCustomLinearUnit", 0.33);
string name = myLinearUnit.Name;                          // myCustomLinearUnit
double convFactor = myLinearUnit.ConversionFactor;        // 0.33
int code = myLinearUnit.FactoryCode;                      // 0 for custom units
double metersUnit = myLinearUnit.MetersPerUnit;           // 0.33
string toString = myLinearUnit.ToString();                // same as Name - myCustomLinearUnit

// convert 10 centimeters to myLinearUnit 
double convertedVal = LinearUnit.Centimeters.ConvertTo(10, myLinearUnit);


// get the wkt
string lu_wkt = myLinearUnit.Wkt;

// create an angular unit from this wkt
var anotherLinearUnit = LinearUnit.CreateLinearUnit(lu_wkt);
// anotherLinearUnit.ConversionFactor = 0.33
// anotherLinearUnit.FactoryCode = 0    
// anotherLinearUnit.MetersPerUnit = 0.33

AreaUnit

AreaUnit - Convert between square feet and square meters

// convert 700 square meters to square feet
double sqFeet = AreaUnit.SquareFeet.ConvertFromSquareMeters(700);

// convert 1100 square feet to square meters
double sqMeters = AreaUnit.SquareFeet.ConvertToSquareMeters(1000);

AreaUnit - Convert between hectares and acres

// convert 2 hectares to acres
double acres = AreaUnit.Hectares.ConvertTo(2, AreaUnit.Acres);

AreaUnit - Convert between hectares and square miles

// convert 300 hectares to square miles
double sqMiles = AreaUnit.Hectares.ConvertTo(300, AreaUnit.SquareMiles);

AreaUnit - How many Square meters in various units

double sqMetersPerUnit = AreaUnit.Acres.SquareMetersPerUnit;
sqMetersPerUnit = AreaUnit.Ares.SquareMetersPerUnit;
sqMetersPerUnit = AreaUnit.Hectares.SquareMetersPerUnit;
sqMetersPerUnit = AreaUnit.SquareKilometers.SquareMetersPerUnit;
sqMetersPerUnit = AreaUnit.SquareMiles.SquareMetersPerUnit;
sqMetersPerUnit = AreaUnit.SquareYards.SquareMetersPerUnit;

AreaUnit - Create an AreaUnit

try
{
  var myFactoryCodeInit = AreaUnit.CreateAreaUnit(109439);     // 109439 is the factory code for square miles

  var myWktUnit = AreaUnit.CreateAreaUnit("HECTARE_AREAUNIT[\"H\",10000.0]");

  var myCustomUnit = AreaUnit.CreateAreaUnit("myAreaUnit", 12);
}
catch (ArgumentException)
{
  // ArgumentException will be thrown by CreateAreaUnit in the following scenarios
  // - if the factory code used is a non-areal factory code  (i.e. it corresponds to degrees which is an angular unit code)
  // - if the factory code used is invalid (i.e. it is negative or doesn't correspond to any factory code)
}
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