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A Picture is Worth a Thousand Words


     

dx←x-Rx←⌊x
dy←y-Ry←⌊y
bg←1≤dx+dy  ⍝ blue/green
b ←bg^dx<dy ⍝ blue
g ←bg^dx≥dy ⍝ green
(Rx+b)j(Ry+g)