Gradient fill with error diffusion.
See also en.wikipedia.org/wik…3steinberg_dithering
This implementation zig-zags to reduce some artifact patterns.
I couldn't solid-fill the drawing area. Even at 0.1 step size there were gaps.
#dither #pixel #gradient
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// Floyd-Steinberg dithering. Implemented by @imakerobots// https://turtletoy.net/turtle/d47e2bad0c