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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from vtkmodules.vtkIOImage import (
vtkBMPReader,
vtkTIFFReader,
)
from vtkmodules.vtkImagingCore import (
vtkImageAppendComponents,
vtkImageBlend,
vtkImageShiftScale,
vtkImageShrink3D,
vtkImageThreshold,
)
from vtkmodules.vtkImagingColor import vtkImageLuminance
from vtkmodules.vtkRenderingCore import (
vtkActor2D,
vtkImageMapper,
vtkRenderWindow,
vtkRenderWindowInteractor,
vtkRenderer,
)
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
import vtkmodules.test.Testing
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
class TestAllBlendsFloat(vtkmodules.test.Testing.vtkTest):
def testAllBlendsFloat(self):
# This script blends images that consist of float data
renWin = vtkRenderWindow()
renWin.SetSize(512, 256)
# Image pipeline
inputImage = vtkTIFFReader()
inputImage.SetFileName(VTK_DATA_ROOT + "/Data/beach.tif")
# "beach.tif" image contains ORIENTATION tag which is
# ORIENTATION_TOPLEFT (row 0 top, col 0 lhs) type. The TIFF
# reader parses this tag and sets the internal TIFF image
# orientation accordingly. To overwrite this orientation with a vtk
# convention of ORIENTATION_BOTLEFT (row 0 bottom, col 0 lhs ), invoke
# SetOrientationType method with parameter value of 4.
inputImage.SetOrientationType(4)
inputImage2 = vtkBMPReader()
inputImage2.SetFileName(VTK_DATA_ROOT + "/Data/masonry.bmp")
# shrink the images to a reasonable size
shrink1 = vtkImageShrink3D()
shrink1.SetInputConnection(inputImage.GetOutputPort())
shrink1.SetShrinkFactors(2, 2, 1)
shrink2 = vtkImageShrink3D()
shrink2.SetInputConnection(inputImage2.GetOutputPort())
shrink2.SetShrinkFactors(2, 2, 1)
color = vtkImageShiftScale()
color.SetOutputScalarTypeToFloat()
color.SetShift(0)
color.SetScale(1.0 / 255)
color.SetInputConnection(shrink1.GetOutputPort())
backgroundColor = vtkImageShiftScale()
backgroundColor.SetOutputScalarTypeToFloat()
backgroundColor.SetShift(0)
backgroundColor.SetScale(1.0 / 255)
backgroundColor.SetInputConnection(shrink2.GetOutputPort())
# create a greyscale version
luminance = vtkImageLuminance()
luminance.SetInputConnection(color.GetOutputPort())
backgroundLuminance = vtkImageLuminance()
backgroundLuminance.SetInputConnection(backgroundColor.GetOutputPort())
# create an alpha mask
alpha = vtkImageThreshold()
alpha.SetInputConnection(luminance.GetOutputPort())
alpha.ThresholdByLower(0.9)
alpha.SetInValue(1.0)
alpha.SetOutValue(0.0)
# make luminanceAlpha and colorAlpha versions
luminanceAlpha = vtkImageAppendComponents()
luminanceAlpha.AddInputConnection(luminance.GetOutputPort())
luminanceAlpha.AddInputConnection(alpha.GetOutputPort())
colorAlpha = vtkImageAppendComponents()
colorAlpha.AddInputConnection(color.GetOutputPort())
colorAlpha.AddInputConnection(alpha.GetOutputPort())
foregrounds = ["luminance", "luminanceAlpha", "color", "colorAlpha"]
backgrounds = ["backgroundColor", "backgroundLuminance"]
deltaX = 1.0 / 4.0
deltaY = 1.0 / 2.0
blend = dict()
mapper = dict()
actor = dict()
imager = dict()
for row, bg in enumerate(backgrounds):
for column, fg in enumerate(foregrounds):
blend.update({bg:{fg:vtkImageBlend()}})
blend[bg][fg].AddInputConnection(eval(bg + '.GetOutputPort()'))
if bg == "backgroundColor" or fg == "luminance" or fg == "luminanceAlpha":
blend[bg][fg].AddInputConnection(eval(fg + '.GetOutputPort()'))
blend[bg][fg].SetOpacity(1, 0.8)
mapper.update({bg:{fg:vtkImageMapper()}})
mapper[bg][fg].SetInputConnection(blend[bg][fg].GetOutputPort())
mapper[bg][fg].SetColorWindow(1.0)
mapper[bg][fg].SetColorLevel(0.5)
actor.update({bg:{fg:vtkActor2D()}})
actor[bg][fg].SetMapper(mapper[bg][fg])
imager.update({bg:{fg:vtkRenderer()}})
imager[bg][fg].AddViewProp(actor[bg][fg])
imager[bg][fg].SetViewport(column * deltaX, row * deltaY, (column + 1) * deltaX, (row + 1) * deltaY)
renWin.AddRenderer(imager[bg][fg])
# render and interact with data
iRen = vtkRenderWindowInteractor()
iRen.SetRenderWindow(renWin);
renWin.Render()
img_file = "TestAllBlendsFloat.png"
vtkmodules.test.Testing.compareImage(iRen.GetRenderWindow(), vtkmodules.test.Testing.getAbsImagePath(img_file))
vtkmodules.test.Testing.interact()
if __name__ == "__main__":
vtkmodules.test.Testing.main([(TestAllBlendsFloat, 'test')])
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