Ipolygon - ObjectVision/GeoDMS GitHub Wiki

Conversion functions ipolygon

• ipolygon(a)

ipolygon(a) converts the coordinates of a point item a with a sequence of points (arc or polygon) to the ipoint (int32 coordinates) value type.

Since GeoDms 20.15.1 the result keeps the composition type of its argument: polygon stays polygon, arc stays arc, multipoint stays multipoint (as convert does since 20.3.0, issue 1038). In earlier versions the result was always treated as arc, so casting a polygon data item made polygon-consuming operators such as bp_union_polygon warn about arc geometry.

• data item with Point value type and composition type arc or polygon

attribute<ipoint> ipolygonA (SDomain, polygon) := ipolygon(A);