ZOO.Geometry.Polygon

Polygon is a collection of ZOO.Geometry.LinearRing.

Inherits from

• ZOO.Geometry.Collection

Functions

NAME	DESCRIPTION
ZOO.Geometry.Polygon	Constructor for a Polygon geometry.
getArea	Calculated by subtracting the areas of the internal holes from the area of the outer hole.
containsPoint	Test if a point is inside a polygon.
createRegularPolygon	Create a regular polygon around a radius.

ZOO.Geometry.Polygon

Constructor for a Polygon geometry. The first ring (this.component[0]) is the outer bounds of the polygon and all subsequent rings (this.component[1-n]) are internal holes.

Parameters

components {Array(ZOO.Geometry.LinearRing)}

getArea

getArea: function()

Calculated by subtracting the areas of the internal holes from the area of the outer hole.

Returns

{float} The area of the geometry

containsPoint

containsPoint: function(point)

Test if a point is inside a polygon. Points on a polygon edge are considered inside.

Parameters

point {ZOO.Geometry.Point}

Returns

{Boolean | Number} The point is inside the polygon. Returns 1 if the point is on an edge. Returns boolean otherwise.

createRegularPolygon

ZOO.Geometry.Polygon.createRegularPolygon = function( origin,
                                                      radius,
                                                      sides,
                                                      rotation      )

Create a regular polygon around a radius. Useful for creating circles and the like.

Parameters

origin {ZOO.Geometry.Point} center of polygon.

radius {Float} distance to vertex, in map units.

sides {Integer} Number of sides. 20 approximates a circle.

rotation {Float} original angle of rotation, in degrees.