I wanted to fill a circular area on a tile grid: https://www.redblobgames.com/grids/circle-fill/ … I picked slower but simpler code than bresenham's circle algorithmpic.twitter.com/FAwhITSC01
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0.25 makes sense, since as the circle passes through a pixel, the pixel's contribution to the error goes from 0 to 0.5 back to 0. On average, 0.25.
My boring theory, btw, is that the regular oscillations with period 1 come from just the four cardinal-direction pixels sticking out. Boooring.
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