# [name]

A class containing utility functions for shapes.
Note that these are all linear functions so it is necessary 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 necessary 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. An array of [page:Vector2].
holes -- An array that holds arrays of [page:Vector2]s. Each array represents a single hole definition.
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]