Run this in turbo mode. The method used in this project is based on a square-filling method by @griffpatch_tutor. If any of you know how to make this faster (without sacrificing quality) or know of a faster method of filling rectangles, please tell me. Limitations: - Doesn't work well with pen transparency - The maximum rectangle size is n×255 or 255×n - The X- and Y- values must be sorted - Rectangles with non-integer X- or Y-values can look a little imprecise, although I'm not sure how to fix this - The corners can be semi-transparent