Weizhen Huang
6166dac3ee
Zero-sized gizmos were not shown because GPU does not draw filled triangles with zero area. This problem is resolved by drawing lines or points in these degenerated cases. Scaling is supported via computing the original and the new size, then treat the case with zero original size separately, instead of only computing the scale itself. Actually applies to all `cage2d` gizmos, but not compatible when translate flag is set.