Function contourCase

Filters/Modeling/Testing/Python/TestBandedContourFilter2.py:116–154

Create a renderer, actor, mapper to contour the polydata poly : polydata to contour mode : scalar-mode for BPDCF

(poly,mode)

   return poly

def contourCase(poly,mode):
   """
   Create a renderer, actor, mapper to contour the polydata
   poly : polydata to contour
   mode : scalar-mode for BPDCF
   """
   # Prepare an array of point-data scalars

   # Perform the contouring. Note that we need to set scalar
   # mode to index because line cells do not get contour values
   # even if scalar mode is set to value.
   valueRange=poly.GetPointData().GetScalars().GetRange()
   num=5
   bpdcf = vtkBandedPolyDataContourFilter()
   bpdcf.SetInputData(poly)
   bpdcf.GenerateValues( num, valueRange[0],valueRange[1] )
   bpdcf.GenerateContourEdgesOff()
   if mode == 'index':
     bpdcf.SetScalarModeToIndex()
   elif mode == 'value':
     bpdcf.SetScalarModeToValue()
   bpdcf.Update()

   # Shrink all cells somewhat so the contouring of edges can
   # be seen better
   sf = vtkShrinkFilter()
   sf.SetShrinkFactor(0.90)
   sf.SetInputConnection( bpdcf.GetOutputPort())

   # Mapper shows contour index values
   m = vtkDataSetMapper()
   m.SetInputConnection(sf.GetOutputPort())
   m.SetScalarModeToUseCellData()
   m.SetScalarRange(bpdcf.GetOutput().GetCellData().GetArray('Scalars').GetRange())

   a = vtkActor()
   a.SetMapper(m)

   return a

# four contouring cases to test
cases = [ (True,  'quad',      100.0, [0.0,0.5,0.5,1.0]),   # 1,5 : upper-left