To define a polygon, pass a variable number of Position2D structs representing the points of the polygon.
var polygon = new Polygon( new Position2D(-2, 0), new Position2D(0, 2), new Position2D(2, 0), );
This polygon, for example, is a triangle.
Be careful not to define a concave Polygon, as this will cause the results of collision detection to be incorrect. Support for concave polygons is planned for a future release.
Polygons are considered equal if they define the same vertices, regardless of order. They can even be equivalent to Rectangles:
var a = new Polygon( new Position2D(1, 1), new Position2D(1, -1), new Position2D(-1, -1), new Position2D(-1, 1) ); var b = new Rectangle(-1, -1, 1, 1); a == b; // true!