A slowly rotating random shape. Green flag to generate a new shape; click with your mouse to add points to the polygon.
Part of my Generative-Art-a-Day project (https://scratch.mit.edu/studios/1307094) More info about conversion of r/theta coordinates to x/y screen coordinates here: https://en.wikipedia.org/wiki/Polar_coordinate_system#Converting_between_polar_and_Cartesian_coordinates
