landswellsong
commented
7 years ago - Only allow several redraws of a preview shape per second or something so that rapid mouse movement doesn't result in sluggish execution
- For polygonal selection we don't need to redraw the polygon each time. Suppose we added A, B, ... N points and are adding a new point P. We can then draw the A, B, ... N polygon once and only redraw the preview of a A, N, P triangle. I.e.:
