@technobuddha > library > Geometry > Rectangle

Function: isInPolygon()

function isInPolygon(object: Cartesian | Rect | Polygon, polygon: Polygon): boolean;

Defined in: is-in-polygon.ts:31

Determines whether a given point or rectangle is inside or on the edge of a polygon.

Parameters

Parameter	Type	Description
object	Cartesian | Rect | Polygon	The point or rectangle to test.
polygon	Polygon	The polygon to test against, represented as an array of Cartesian coordinates.

Returns

boolean

true if the object is inside the polygon or on its edge, otherwise false.

Example

isInPolygon(
  { x: 5, y: 5 },
  [{ x: 0, y: 0 }, { x: 10, y: 0}, { x: 10, y: 10 }, { x: 0, y: 10 }]
); // true

Remarks

• The polygon is assumed to be a simple, non-self-intersecting polygon.
• Points on the edge of the polygon return true.
• For rectangles, all corners must be inside the polygon.
• Uses ray-casting algorithm with explicit edge detection.