Values.hs

   1 {-# LANGUAGE FlexibleInstances #-}
   2
   3 module Values
   4 where
   5
   6 import Data.Array.Repa (
   7   Array,
   8   Z(..),
   9   (:.)(..),
  10   DIM1,
  11   DIM2,
  12   DIM3,
  13   extent,
  14   fromList,
  15   index,
  16   reshape,
  17   size
  18   )
  19
  20 import Data.Array.Repa.IO.Vector (readVectorFromTextFile,
  21                                   writeVectorToTextFile)
  22 import System.FilePath ()
  23 import Test.QuickCheck (Arbitrary(..), Gen, choose, vectorOf)
  24
  25
  26 import ScaleFactor
  27
  28
  29 type Values1D = Array DIM1 Double
  30 type Values2D = Array DIM2 Double
  31 type Values3D = Array DIM3 Double
  32
  33
  34 instance Arbitrary Values3D where
  35     arbitrary = do
  36       -- I declare not to care about empty lists.
  37       x_dim <- choose (1, 27)
  38       y_dim <- choose (1, 27)
  39       z_dim <- choose (1, 27)
  40       elements <- vectorOf (x_dim * y_dim * z_dim) (arbitrary :: Gen Double)
  41       let new_shape = (Z :. x_dim :. y_dim :. z_dim)
  42       let three_d = Data.Array.Repa.fromList new_shape elements
  43       return three_d
  44
  45
  46 read_values_1d :: FilePath -> IO Values1D
  47 read_values_1d = readVectorFromTextFile
  48
  49
  50 read_values_3d :: DIM3 -> FilePath -> IO Values3D
  51 read_values_3d sh path = do
  52   one_d <- read_values_1d path
  53   return $ reshape sh one_d
  54
  55 write_values_1d :: Values3D -> FilePath -> IO ()
  56 write_values_1d v3d path = do
  57   let size3d = size $ extent v3d
  58   let shape1d = (Z :. size3d)
  59   let v1d = reshape shape1d v3d
  60   writeVectorToTextFile v1d path
  61
  62 empty3d :: Values3D
  63 empty3d = Data.Array.Repa.fromList (Z :. 0 :. 0 :. 0) []
  64
  65
  66 dims :: Values3D -> (Int, Int, Int)
  67 dims v3d =
  68     let (Z :. x :. y :. z) = extent v3d
  69     in
  70       (x,y,z)
  71
  72
  73 idx :: Values3D -> Int -> Int -> Int -> Double
  74 idx v3d i j k =
  75     index v3d shape
  76     where
  77       shape :: DIM3
  78       shape = (Z :. i :. j :. k)
  79
  80
  81 zoom_shape :: ScaleFactor -> DIM3 -> DIM3
  82 zoom_shape (sfx, sfy, sfz) sh =
  83     let (Z :. x :. y :. z) = sh
  84         x' = x * sfx
  85         y' = y * sfy
  86         z' = z * sfz
  87     in
  88       (Z :. x' :. y' :. z')