def GetSample(obj, ev):
# Get the observed plane and bind it
planeX = GetSample.planeX
imageActor2.SetInputData(planeX.GetResliceOutput())
ren2.AddActor(imageActor2)
renWin.AddRenderer(ren2)
# Set the number of scalar components to 3,
# otherwise vtkImageAccumulate can't process it.
# planeX.GetResliceOutput().AllocateScalars(vtk.VTK_INT, 3)
# Set the input data for histogram
histogram.SetInputData(planeX.GetResliceOutput())
histogram.Update()
# Construct an array to store the histogram
red = [1, 0, 0]
frequencies = vtk.vtkIntArray()
frequencies.SetNumberOfComponents(1)
frequencies.SetNumberOfTuples(256)
o = histogram.GetOutput()
output = o.GetPointData().GetScalars()
j = 0
while j < 256:
frequencies.SetTuple1(j, output.GetValue(j))
j = j + 1
# Convert the array to vtkDataObject
dataObject = vtk.vtkDataObject()
dataObject.GetFieldData().AddArray(frequencies)
# Create a barChart to display the histogram
barChart = vtk.vtkBarChartActor()
barChart.SetInput(dataObject)
barChart.SetTitle("Histogram")
barChart.GetPositionCoordinate().SetValue(0.05, 0.05, 0.0)
barChart.GetPosition2Coordinate().SetValue(0.95, 0.85, 0.0)
barChart.GetProperty().SetColor(1, 1, 1)
barChart.GetLegendActor().SetNumberOfEntries(
dataObject.GetFieldData().GetArray(0).GetNumberOfTuples())
barChart.LegendVisibilityOff()
barChart.LabelVisibilityOff()
count = 0
while count < 256:
barChart.SetBarColor(count, red)
count += 1
# Visualize the histogram
ren3 = vtk.vtkRenderer()
ren3.SetViewport(0.5, 0, 1.0, 0.5)
ren3.AddActor(barChart)
renWin.AddRenderer(ren3)
def plotHistogram(self, renderer):
barChart = vtk.vtkBarChartActor()
dataObject = vtk.vtkDataObject()
dataObject.GetFieldData().AddArray(self.FreqArray)
for i in range(0, self.BinsCount):
barChart.SetBarLabel(i, "{0:.2f}".format(self.getBinCenter(i)))
barChart.SetInput(dataObject)
barChart.GetLegendActor().SetNumberOfEntries(dataObject.GetFieldData().GetArray(0).GetNumberOfTuples())
barChart.LegendVisibilityOff()
barChart.LabelVisibilityOn()
barChart.GetProperty().SetColor(1, 1, 1)
renderer.AddActor(barChart)
bitter = numpy_to_vtk(colors_numpy_array, deep=True, array_type=vtk.VTK_FLOAT)
#print vtk_data_array
#bitter = vtk.vtkFloatArray
#bitter.SetNumberOfTuples(numTuples);
#for i in range(0, numTuples):#(int i=0; i<numTuples; i++)
# bitter.SetTuple1(i, vtk.vtkMath::Random(7,100))
dobj = vtk.vtkDataObject()
dobj.GetFieldData().AddArray(bitter)
actor = vtk.vtkBarChartActor()
actor.SetInput(dobj);
actor.SetTitle("Bar Chart");
actor.GetPositionCoordinate().SetValue(0.05,0.05,0.0);
actor.GetPosition2Coordinate().SetValue(0.95,0.85,0.0);
actor.GetProperty().SetColor(1,1,1);
actor.GetLegendActor().SetNumberOfEntries(numTuples);
'''
for (int i=0; i<numTuples; i++)
{
double red=vtkMath::Random(0,1);
double green=vtkMath::Random(0,1);
double blue=vtkMath::Random(0,1);
actor.SetBarColor(i,red,green,blue);
}
