Kestrel Lua API / Math

Point

The Point structure encompasses information about a given point in a coordinate system, and can be used to perform various operations and calculations regarding distances between two points in space.

Making a Point

Constructing a new point is a trivial operation. All you need to do is simply:

local p = Point(50, 100)

The first value specified is the X-coordinate, and the second is the Y-coordinate.

Instance Properties

The following properties are exposed on Point instances.

Property Name	Type	Access	Lua API Version
x	Double	Set, Get	v0.0.1
y	Double	Set, Get	v0.0.1

---

Point.x

Returns or sets the X-coordinate value for the point.

---

Point.y

Returns or sets the Y-coordinate value for the point.

Instance Methods

The following methods are exposed on Point instances.

Method Name	Return Type	Lua API Version
distanceTo(Point)	Double	v0.0.1
subtract(Point)	Point	v0.0.1
add(Point)	Point	v0.0.1
multiply(Double)	Point	v0.0.1
divide(Double)	Point	v0.0.1

---

Point.distanceTo(Point)

Calculates the distance between the receiver and the specified point and returns the value as a Double.

Example

Point(1, 1):distanceto(Point(5, 1)) -- returns 4.0

---

Point.subtract(Point)

Subtracts the specified point from the receiver, resulting in a new point.

Example

Point(5, 5):subtract(Point(5, 1)) -- returns Point(0, 4)

---

Point.add(Point)

Add the specified point to the receiver, resulting in a new point.

Example

Point(5, 5):add(Point(5, 1)) -- returns Point(10, 6)

---

Point.multiply(Double)

Multiplies/Scales the receiver by the specified value, resulting in a new point.

Example

Point(1, 0.5):multiply(10) -- returns Point(10, 5)

---

Point.divide(Double)

Divides/Scales the receiver by the specified value, resulting in a new point.

Example

Point(10, 5):divide(2) -- returns Point(1, 0.5)