kball←{                     ⍝ Relationship between point and k-ball.
    ⍺←1 ⋄ r←⊃⍺ ⋄ p←1/⍵      ⍝ Default is ball w/radius 1 at origin.
    c(p)↑1↓⍺              ⍝ Remaining coordinates are center.
    ×↑-/(p-[⎕IO]c)r+.*¨2   ⍝ Perform signum difference.
}
code_colours

test script

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