VTK/Examples/Python/Interaction/MouseEventsObserver

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VTK Examples Baseline Interaction TestMouseEvents.png

This example directly changes the observers of the vtkInteractor, which is an easy way to disable events or to add some simple callback functions. For a more general framework using vtkInteractorStyle see VTK/Examples/Python/Interaction/MouseEvents. This specific example just disables the left mouse button of the vtkInteractorStyleTrackballCamera and prints a simple message instead.

MouseEventsObserver.py

import vtk
 
source = vtk.vtkSphereSource()
source.SetCenter(0,0,0)
source.SetRadius(1)
source.Update()
 
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(source.GetOutputPort())
 
actor = vtk.vtkActor()
actor.SetMapper(mapper)
 
renderer = vtk.vtkRenderer()
renderer.SetBackground(1,1,1)
renderer.AddActor(actor)
 
renwin = vtk.vtkRenderWindow()
renwin.AddRenderer(renderer)
 
interactor = vtk.vtkRenderWindowInteractor()
interactor.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
interactor.SetRenderWindow(renwin)
 
def DummyFunc1(obj, ev):
        print "Before Event"
def DummyFunc2(obj, ev):
        print "After Event"
 
## Print interator gives you a list of registered observers of the current interactor style
#print interactor
 
 
## adding priorities allow to control the order of observer execution 
## (highest value first! if equal the first added observer is called first)
interactor.RemoveObservers('LeftButtonPressEvent')
interactor.AddObserver('LeftButtonPressEvent', DummyFunc1, 1.0)
interactor.AddObserver('LeftButtonPressEvent', DummyFunc2, -1.0)
interactor.Initialize()
interactor.Start()
Retrieved from "http://www.vtk.org/Wiki/VTK/Examples/Python/Interaction/MouseEventsObserver"
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