+
+
+transpose_zx :: Elt a => Array DIM3 a -> Array DIM3 a
+transpose_zx arr =
+ traverse arr
+ (\(Z :. zdim :. ydim :. xdim) -> (Z :. xdim :. ydim :. zdim))
+ (\_ -> (\(Z :. z :. y :. x) -> arr ! (Z :. x :. y :. z)))
+
+
+z_slice3 :: Elt a => Int -> Array DIM3 a -> Array DIM3 a
+z_slice3 n arr
+ | n == 0 = transpose_zx $ current R.++ next
+ | n == zdim-1 = transpose_zx $ previous R.++ current
+ | otherwise = transpose_zx $ previous R.++ current R.++ next
+ where
+ (Z :. zdim :. _ :. _) = extent arr
+ previous = transpose_zx $ reshape mri_slice3d (z_slice (n-1) arr)
+ current = transpose_zx $ reshape mri_slice3d (z_slice n arr)
+ next = transpose_zx $ reshape mri_slice3d (z_slice (n+1) arr)
+
+
+write_values_slice_to_bitmap :: Values2D -> FilePath -> IO ()
+write_values_slice_to_bitmap v3d path =
+ R.writeComponentsToBMP path routput goutput boutput
+ where
+ arr_bracketed = bracket_array v3d
+ colors = values_to_colors $ R.map fromIntegral arr_bracketed
+ routput = R.map (\(red, _, _) -> red) colors
+ goutput = R.map (\(_, green, _) -> green) colors
+ boutput = R.map (\(_, _, blue) -> blue) colors
+
+
+write_values_chunk_to_bitmap :: Values3D -> FilePath -> IO ()
+write_values_chunk_to_bitmap v3d path
+ | zdim /= 3 = error "not a 3xMxN chunk"
+ | otherwise = write_values_slice_to_bitmap target_slice path
+ where
+ (Z :. zdim :. _ :. _) = extent v3d
+ target_slice = z_slice 1 v3d
+