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17 lines
396 B
Lua
17 lines
396 B
Lua
local thickness = 72 -- change this to change the spiral thickness.
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local inv_pi = 1 / math.pi
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local thickness2 = thickness * 2
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return function(x, y)
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local d = math.sqrt(x * x + y * y)
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if d < 128 then
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return true
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end
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local angle = 1 + inv_pi * math.atan2(x, y)
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local offset = d + (angle * thickness)
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return offset % thickness2 >= thickness
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end
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