Use faster version: https://scratch.mit.edu/projects/693422656/ - It runs about 2.1x faster with hue only mode. - Hue only: 25k /sec , full RGB: 11k /sec - I need to experiment with different sizes of costume to see what's best. As 8x8 px may not be optimal. Created in response to Rex saying stamping is slow. Spoilers it's really not ;)
How it works: 1. Stamp a square on either side of the rect fully filling the size. 2. Draw a line between the centers of the square, if rectangle has greater than 1:2 proportions. Done :)