Difference between revisions of "VTK/Examples/Python/Interaction/MouseEventsObserver"

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m (Minor code cleanup)
Line 4: Line 4:
 
==MouseEventsObserver.py==
 
==MouseEventsObserver.py==
 
<source lang="python">
 
<source lang="python">
 +
#!/usr/bin/env python
 +
 
import vtk
 
import vtk
 
+
 
source = vtk.vtkSphereSource()
 
source = vtk.vtkSphereSource()
source.SetCenter(0,0,0)
+
source.SetCenter(0, 0, 0)
 
source.SetRadius(1)
 
source.SetRadius(1)
 
source.Update()
 
source.Update()
 
+
 
mapper = vtk.vtkPolyDataMapper()
 
mapper = vtk.vtkPolyDataMapper()
 
mapper.SetInputConnection(source.GetOutputPort())
 
mapper.SetInputConnection(source.GetOutputPort())
 
+
 
actor = vtk.vtkActor()
 
actor = vtk.vtkActor()
 
actor.SetMapper(mapper)
 
actor.SetMapper(mapper)
 
+
 
renderer = vtk.vtkRenderer()
 
renderer = vtk.vtkRenderer()
renderer.SetBackground(1,1,1)
+
renderer.SetBackground(1, 1, 1)
 
renderer.AddActor(actor)
 
renderer.AddActor(actor)
 
+
 
renwin = vtk.vtkRenderWindow()
 
renwin = vtk.vtkRenderWindow()
 
renwin.AddRenderer(renderer)
 
renwin.AddRenderer(renderer)
 
+
 
interactor = vtk.vtkRenderWindowInteractor()
 
interactor = vtk.vtkRenderWindowInteractor()
 
interactor.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
 
interactor.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
 
interactor.SetRenderWindow(renwin)
 
interactor.SetRenderWindow(renwin)
 
+
 
def DummyFunc1(obj, ev):
 
def DummyFunc1(obj, ev):
        print "Before Event"
+
    print "Before Event"
 +
   
 
def DummyFunc2(obj, ev):
 
def DummyFunc2(obj, ev):
        print "After Event"
+
    print "After Event"
 
+
## Print interator gives you a list of registered observers of the current interactor style
+
# Print interator gives you a list of registered observers of the current  
 +
# interactor style
 
#print interactor
 
#print interactor
 
+
 
+
 
## adding priorities allow to control the order of observer execution  
 
## adding priorities allow to control the order of observer execution  
 
## (highest value first! if equal the first added observer is called first)
 
## (highest value first! if equal the first added observer is called first)
Line 44: Line 48:
 
interactor.Initialize()
 
interactor.Initialize()
 
interactor.Start()
 
interactor.Start()
 +
 
</source>
 
</source>

Revision as of 03:24, 31 October 2013

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

#!/usr/bin/env python

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()