src/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, Positive(..), 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       (Positive x_dim) <- arbitrary :: Gen (Positive Int)
  37       (Positive y_dim) <- arbitrary :: Gen (Positive Int)
  38       (Positive z_dim) <- arbitrary :: Gen (Positive Int)
  39       elements <- vectorOf (x_dim * y_dim * z_dim) (arbitrary :: Gen Double)
  40       let new_shape = (Z :. x_dim :. y_dim :. z_dim)
  41       let three_d = Data.Array.Repa.fromList new_shape elements
  42       return three_d
  43
  44
  45 read_values_1d :: FilePath -> IO Values1D
  46 read_values_1d = readVectorFromTextFile
  47
  48
  49 read_values_3d :: DIM3 -> FilePath -> IO Values3D
  50 read_values_3d sh path = do
  51   one_d <- read_values_1d path
  52   return $ reshape sh one_d
  53
  54 write_values_1d :: Values3D -> FilePath -> IO ()
  55 write_values_1d v3d path = do
  56   let size3d = size $ extent v3d
  57   let shape1d = (Z :. size3d)
  58   let v1d = reshape shape1d v3d
  59   writeVectorToTextFile v1d path
  60
  61 empty3d :: Values3D
  62 empty3d = Data.Array.Repa.fromList (Z :. 0 :. 0 :. 0) []
  63
  64
  65 dims :: Values3D -> (Int, Int, Int)
  66 dims v3d =
  67     let (Z :. x :. y :. z) = extent v3d
  68     in
  69       (x,y,z)
  70
  71
  72 idx :: Values3D -> Int -> Int -> Int -> Double
  73 idx v3d i j k =
  74     index v3d shape
  75     where
  76       shape :: DIM3
  77       shape = (Z :. i :. j :. k)
  78
  79
  80 zoom_shape :: ScaleFactor -> DIM3 -> DIM3
  81 zoom_shape (sfx, sfy, sfz) sh =
  82     let (Z :. x :. y :. z) = sh
  83         x' = x * sfx
  84         y' = y * sfy
  85         z' = z * sfz
  86     in
  87       (Z :. x' :. y' :. z')