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48 lines
1.8 KiB
48 lines
1.8 KiB
module Datatypes.Cell (Cell(..), rotateClockwise, rotateCounterclockwise ) where
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type Cell = (Int, Int)
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rotateClockwise :: Cell -> Cell -> Cell
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rotateClockwise pivot cell = let cubeCell = toCube cell
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cubePivot = toCube pivot
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cubeZero = cubeCell `cubeDiff` cubePivot
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rotatedZero = rotateCubeClockwise cubeZero
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rotatedCube = rotatedZero `cubeSum` cubePivot
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resultCell = fromCube rotatedCube
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in resultCell
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rotateCounterclockwise :: Cell -> Cell -> Cell
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rotateCounterclockwise pivot cell = let cubeCell = toCube cell
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cubePivot = toCube pivot
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cubeZero = cubeCell `cubeDiff` cubePivot
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rotatedZero = rotateCubeCounterclockwise cubeZero
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rotatedCube = rotatedZero `cubeSum` cubePivot
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resultCell = fromCube rotatedCube
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in resultCell
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-- PRIVATE
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type CubeCell = (Int, Int, Int)
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toCube :: Cell -> CubeCell
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toCube (x, y) = (xx, yy, zz) where
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xx = x - (y - (y `mod` 2)) `div` 2
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zz = y
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yy = -(xx + zz)
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rotateCubeClockwise :: CubeCell -> CubeCell
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rotateCubeClockwise (xx, yy, zz) = (-zz, -xx, -yy)
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rotateCubeCounterclockwise :: CubeCell -> CubeCell
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rotateCubeCounterclockwise (xx, yy, zz) = (-yy, -zz, -xx)
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fromCube :: CubeCell -> Cell
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fromCube (xx, yy, zz) = (x, y) where
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x = xx + (zz - (zz `mod` 2)) `div` 2
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y = zz
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cubeDiff :: CubeCell -> CubeCell -> CubeCell
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cubeDiff (x1, y1, z1) (x2, y2, z2) = (x1 - x2, y1 - y2, z1 - z2)
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cubeSum :: CubeCell -> CubeCell -> CubeCell
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cubeSum (x1, y1, z1) (x2, y2, z2) = (x1 + x2, y1 + y2, z1 + z2)
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