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72 lines
1.5 KiB
72 lines
1.5 KiB
#
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# This example shows how to add an observer to a Tcl program. It extends
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# the Step1/Tcl/Cone.tcl Tcl 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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#
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# First we include the VTK Tcl packages which will make available
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# all of the vtk commands to Tcl
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#
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package require vtk
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#
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# Here we define our callback
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#
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proc myCallback {} {
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puts "Starting to render"
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}
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#
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# Next we create the pipelinne
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#
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vtkConeSource cone
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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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vtkPolyDataMapper coneMapper
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coneMapper SetInputConnection [cone GetOutputPort]
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vtkActor coneActor
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coneActor SetMapper coneMapper
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vtkRenderer ren1
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ren1 AddActor coneActor
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ren1 SetBackground 0.1 0.2 0.4
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# here we setup the callback
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ren1 AddObserver StartEvent myCallback
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vtkRenderWindow renWin
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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 {set i 0} {$i < 360} {incr i} {
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after 10
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# render the image
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renWin Render
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# rotate the active camera by one degree
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[ren1 GetActiveCamera] Azimuth 1
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}
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#
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# Free up any objects we created
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#
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vtkCommand DeleteAllObjects
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#
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# exit the application
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#
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exit
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