Polygon Geom

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# 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.