Function vtkRegressionTestImage

Wrapping/Python/vtkmodules/util/misc.py:91–133

vtkRegressionTestImage(renWin) -- produce regression image for window This function writes out a regression .png file for a vtkWindow. Does anyone involved in testing care to elaborate?

(renWin)

    return tempDir

def vtkRegressionTestImage(renWin):
    """vtkRegressionTestImage(renWin) -- produce regression image for window

    This function writes out a regression .png file for a vtkWindow.
    Does anyone involved in testing care to elaborate?
    """
    from vtkmodules.vtkRenderingCore import vtkWindowToImageFilter
    from vtkmodules.vtkIOImage import vtkPNGReader
    from vtkmodules.vtkImagingCore import vtkImageDifference

    fname = None
    for i, argv in enumerate(sys.argv):
        if argv == '-V' and i+1 < len(sys.argv):
            fname = os.path.join(vtkGetDataRoot(), sys.argv[i+1])

    if fname is None:
        return 2

    else:
        rt_w2if = vtkWindowToImageFilter()
        rt_w2if.SetInput(renWin)

        if not os.path.isfile(fname):
            rt_pngw = vtkPNGWriter()
            rt_pngw.SetFileName(fname)
            rt_pngw.SetInputConnection(rt_w2if.GetOutputPort())
            rt_pngw.Write()
            rt_pngw = None

        rt_png = vtkPNGReader()
        rt_png.SetFileName(fname)

        rt_id = vtkImageDifference()
        rt_id.SetInputConnection(rt_w2if.GetOutputPort())
        rt_id.SetImageConnection(rt_png.GetOutputPort())
        rt_id.Update()

        if rt_id.GetThresholdedError() <= 10:
            return 1
        else:
            sys.stderr.write('Failed image test: %f\n'
                             % rt_id.GetThresholdedError())
            return 0