#!/usr/bin/env python
import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()

# Use the painter to draw using colors.
# This is not a pipeline object.  It will support pipeline objects.
# Please do not use this object directly.
imageCanvas = vtk.vtkImageCanvasSource2D()
imageCanvas.SetNumberOfScalarComponents(3)
imageCanvas.SetScalarTypeToUnsignedChar()
imageCanvas.SetExtent(0,320,0,320,0,0)
imageCanvas.SetDrawColor(0,0,0)
imageCanvas.FillBox(0,511,0,511)
# r, g, b
imageCanvas.SetDrawColor(255,0,0)
imageCanvas.FillBox(0,50,0,100)
imageCanvas.SetDrawColor(128,128,0)
imageCanvas.FillBox(50,100,0,100)
imageCanvas.SetDrawColor(0,255,0)
imageCanvas.FillBox(100,150,0,100)
imageCanvas.SetDrawColor(0,128,128)
imageCanvas.FillBox(150,200,0,100)
imageCanvas.SetDrawColor(0,0,255)
imageCanvas.FillBox(200,250,0,100)
imageCanvas.SetDrawColor(128,0,128)
imageCanvas.FillBox(250,300,0,100)
# intensity scale
imageCanvas.SetDrawColor(5,5,5)
imageCanvas.FillBox(0,50,110,210)
imageCanvas.SetDrawColor(55,55,55)
imageCanvas.FillBox(50,100,110,210)
imageCanvas.SetDrawColor(105,105,105)
imageCanvas.FillBox(100,150,110,210)
imageCanvas.SetDrawColor(155,155,155)
imageCanvas.FillBox(150,200,110,210)
imageCanvas.SetDrawColor(205,205,205)
imageCanvas.FillBox(200,250,110,210)
imageCanvas.SetDrawColor(255,255,255)
imageCanvas.FillBox(250,300,110,210)
# saturation scale
imageCanvas.SetDrawColor(245,0,0)
imageCanvas.FillBox(0,50,220,320)
imageCanvas.SetDrawColor(213,16,16)
imageCanvas.FillBox(50,100,220,320)
imageCanvas.SetDrawColor(181,32,32)
imageCanvas.FillBox(100,150,220,320)
imageCanvas.SetDrawColor(149,48,48)
imageCanvas.FillBox(150,200,220,320)
imageCanvas.SetDrawColor(117,64,64)
imageCanvas.FillBox(200,250,220,320)
imageCanvas.SetDrawColor(85,80,80)
imageCanvas.FillBox(250,300,220,320)
convert = vtk.vtkImageRGBToHSV()
convert.SetInputConnection(imageCanvas.GetOutputPort())
convertBack = vtk.vtkImageHSVToRGB()
convertBack.SetInputConnection(convert.GetOutputPort())
cast = vtk.vtkImageCast()
cast.SetInputConnection(convertBack.GetOutputPort())
cast.SetOutputScalarTypeToFloat()
cast.ReleaseDataFlagOff()
viewer = vtk.vtkImageViewer()
viewer.SetInputConnection(convertBack.GetOutputPort())
#viewer SetInputConnection [imageCanvas GetOutputPort]
viewer.SetColorWindow(256)
viewer.SetColorLevel(127.5)
viewer.Render()
# --- end of script --
