# [name]

A class containing utility functions for shapes.

Note that these are all linear functions so it is neccessary to calculate separately for
x, y (and z, w if present) components of a vector.

## Methods

### [method:Number area]( contour )

contour -- 2D polygon. An array of THREE.Vector2()

Calculate area of a ( 2D ) contour polygon.

### [method:Boolean isClockWise]( pts )

pts -- points defining a 2D polygon

Note that this is a linear function so it is neccessary to calculate separately for
x, y components of a polygon.

Used internally by [page:Path Path],
[page:ExtrudeGeometry ExtrudeGeometry] and [page:ShapeGeometry ShapeGeometry].

### [method:Array triangulateShape]( contour, holes )

contour -- 2D polygon.

holes -- array of holes

Used internally by [page:ExtrudeGeometry ExtrudeGeometry] and [page:ShapeGeometry ShapeGeometry] to calculate faces in shapes with holes.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]