Applies an homothecy to a figure. Given a point C, called the center, and a real number different from zero r, called the ratio, a homothecy is the map P rightwards arrow from bar C plus r times stack C P with rightwards arrow on top.

homothecy(Point, Real, Figure)

Given a point C, a real r and a figure, applies the homothecy described by C and r to every point of the figure.