56 lines
1.3 KiB
Lua
56 lines
1.3 KiB
Lua
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local Wire = {
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NORTH = 1,
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EAST = 2,
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SOUTH = 4,
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WEST = 8,
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}
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Wire.directions = {
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{bit = Wire.NORTH, opposite = Wire.SOUTH, x = 0, y = -1},
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{bit = Wire.EAST, opposite = Wire.WEST, x = 1, y = 0},
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{bit = Wire.SOUTH, opposite = Wire.NORTH, x = 0, y = 1},
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{bit = Wire.WEST, opposite = Wire.EAST, x = -1, y = 0},
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}
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function Wire.has(mask, bit)
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return math.floor((mask or 0) / bit) % 2 == 1
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end
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function Wire.add(mask, bit)
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mask = mask or 0
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return Wire.has(mask, bit) and mask or mask + bit
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end
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function Wire.remove(mask, bit)
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mask = mask or 0
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return Wire.has(mask, bit) and mask - bit or mask
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end
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function Wire.directionBetween(a, b)
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local dx, dy = b.x - a.x, b.y - a.y
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for _, direction in ipairs(Wire.directions) do
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if direction.x == dx and direction.y == dy then return direction end
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end
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end
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-- Circuit colours are deliberately independent from the RGB gameplay layers.
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-- A stable hash makes a route keep the same editor colour after save/load.
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local palette = {
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{1.00, 0.78, 0.20},
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{0.20, 0.92, 0.92},
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{1.00, 0.42, 0.72},
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{0.62, 1.00, 0.32},
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{0.72, 0.55, 1.00},
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{1.00, 0.55, 0.22},
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}
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function Wire.color(circuitId)
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local hash = 0
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for index = 1, #(circuitId or "") do
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hash = (hash * 33 + circuitId:byte(index)) % 65521
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end
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return palette[hash % #palette + 1]
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end
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return Wire
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