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58 lines
1.3 KiB
58 lines
1.3 KiB
#!/usr/bin/env python
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#
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#
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# This example shows how to add an observer to a Python program. It extends
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# the Step1/Python/Cone.py Python example (see that example for information on
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# the basic setup).
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#
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# VTK uses a command/observer design pattern. That is, observers watch for
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# particular events that any vtkObject (or subclass) may invoke on
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# itself. For example, the vtkRenderer invokes a "StartEvent" as it begins
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# to render. Here we add an observer that invokes a command when this event
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# is observed.
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#
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import vtk
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import time
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#
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# define the callback
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#
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def myCallback(obj,string):
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print "Starting a render"
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#
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# create the basic pipeline as in Step1
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#
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cone = vtk.vtkConeSource()
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cone.SetHeight( 3.0 )
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cone.SetRadius( 1.0 )
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cone.SetResolution( 10 )
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coneMapper = vtk.vtkPolyDataMapper()
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coneMapper.SetInputConnection( cone.GetOutputPort() )
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coneActor = vtk.vtkActor()
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coneActor.SetMapper( coneMapper )
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ren1= vtk.vtkRenderer()
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ren1.AddActor( coneActor )
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ren1.SetBackground( 0.1, 0.2, 0.4 )
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#
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# Add the observer here
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#
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ren1.AddObserver("StartEvent", myCallback)
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer( ren1 )
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renWin.SetSize( 300, 300 )
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#
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# now we loop over 360 degreeees and render the cone each time
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#
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for i in range(0,360):
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time.sleep(0.03)
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renWin.Render()
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ren1.GetActiveCamera().Azimuth( 1 )
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