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Last active March 24, 2020 17:04
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Sandpile Cellular Automaton
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prog.k
/ Sandpiles
/ see: https://www.youtube.com/watch?v=hBdJB-BzudU&t=0s
r: {y(#y)!x+!#y} / rotate y by x places
n: {+/(-1 1r\:x),(-1 1r/:\:x)} / orthogonal neighbor counts
t: {x+(-4*u)+1_+1_n@+0,+0,u:3<x} / toroidal sand collapsing
once: 100 100# 5 / initial board
tick: t / update: just collapse one iteration
draw: {,(;solarized;x)} / draw board as paletted pixels
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