Various
Here we have demos that don't easily fit into the other categories.
Minkowski difference
Visualization of the Minkowski difference of two polygons. This can be used to check for collisions. If the two shapes overlap, the Minkowski difference will contain the origin.
The code can be seen here in the function demoMinkowskiDifference.
Clipping
This shows the clipping of polygons.
The code can be seen here in the function demoClip.