API Reference ▸ Geometry ▸ Polygon Geom
The D3 4.0 API Reference has moved. This page describes the D3 3.x API.
# d3.geom.polygon(vertices)
Returns the input array of vertices with additional methods attached, as described below.
# polygon.area()
Returns the signed area of this polygon. If the vertices are in counterclockwise order, the area is positive, otherwise it is negative.
# polygon.centroid()
Returns a two-element array representing the centroid of this polygon.
# polygon.clip(subject)
Clips the subject polygon against this polygon. In other words, returns a polygon representing the intersection of this polygon and the subject polygon. Assumes the clip polygon is counterclockwise and convex.