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145 lines
4.1 KiB
145 lines
4.1 KiB
package require vtk
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package require vtkinteraction
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package require vtktesting
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# This example demonstrates how to use the vtkLineWidget to seed
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# and manipulate streamlines. Two line widgets are created. One is
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# invoked by pressing 'W', the other by pressing 'L'. Both can exist
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# together.
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# Start by loading some data.
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#
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vtkPLOT3DReader pl3d
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pl3d SetXYZFileName "$VTK_DATA_ROOT/Data/combxyz.bin"
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pl3d SetQFileName "$VTK_DATA_ROOT/Data/combq.bin"
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pl3d SetScalarFunctionNumber 100
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pl3d SetVectorFunctionNumber 202
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pl3d Update
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# The line widget is used seed the streamlines.
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#
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vtkLineWidget lineWidget
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vtkPolyData seeds
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lineWidget SetInput [pl3d GetOutput]
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lineWidget SetAlignToYAxis
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lineWidget PlaceWidget
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lineWidget GetPolyData seeds
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lineWidget ClampToBoundsOn
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vtkRungeKutta4 rk4
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vtkStreamLine streamer
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streamer SetInputConnection [pl3d GetOutputPort]
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streamer SetSource seeds
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streamer SetMaximumPropagationTime 100
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streamer SetIntegrationStepLength .2
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streamer SetStepLength .001
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streamer SetNumberOfThreads 1
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streamer SetIntegrationDirectionToForward
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streamer VorticityOn
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streamer SetIntegrator rk4
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vtkRibbonFilter rf
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rf SetInputConnection [streamer GetOutputPort]
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rf SetWidth 0.1
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rf SetWidthFactor 5
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vtkPolyDataMapper streamMapper
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streamMapper SetInputConnection [rf GetOutputPort]
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eval streamMapper SetScalarRange [[pl3d GetOutput] GetScalarRange]
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vtkActor streamline
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streamline SetMapper streamMapper
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streamline VisibilityOff
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# The second line widget is used seed more streamlines.
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#
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vtkLineWidget lineWidget2
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vtkPolyData seeds2
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lineWidget2 SetInput [pl3d GetOutput]
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lineWidget2 PlaceWidget
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lineWidget2 GetPolyData seeds2
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lineWidget2 SetKeyPressActivationValue L
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vtkStreamLine streamer2
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streamer2 SetInputConnection [pl3d GetOutputPort]
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streamer2 SetSource seeds2
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streamer2 SetMaximumPropagationTime 100
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streamer2 SetIntegrationStepLength .2
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streamer2 SetStepLength .001
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streamer2 SetNumberOfThreads 1
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streamer2 SetIntegrationDirectionToForward
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streamer2 VorticityOn
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streamer2 SetIntegrator rk4
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vtkRibbonFilter rf2
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rf2 SetInputConnection [streamer2 GetOutputPort]
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rf2 SetWidth 0.1
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rf2 SetWidthFactor 5
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vtkPolyDataMapper streamMapper2
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streamMapper2 SetInputConnection [rf2 GetOutputPort]
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eval streamMapper2 SetScalarRange [[pl3d GetOutput] GetScalarRange]
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vtkActor streamline2
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streamline2 SetMapper streamMapper2
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streamline2 VisibilityOff
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vtkStructuredGridOutlineFilter outline
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outline SetInputConnection [pl3d GetOutputPort]
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vtkPolyDataMapper outlineMapper
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outlineMapper SetInputConnection [outline GetOutputPort]
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vtkActor outlineActor
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outlineActor SetMapper outlineMapper
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# Create the RenderWindow, Renderer and both Actors
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#
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vtkRenderer ren1
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vtkRenderWindow renWin
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renWin AddRenderer ren1
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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# Associate the line widget with the interactor
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lineWidget SetInteractor iren
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lineWidget AddObserver StartInteractionEvent BeginInteraction
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lineWidget AddObserver InteractionEvent GenerateStreamlines
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lineWidget2 SetInteractor iren
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lineWidget2 AddObserver StartInteractionEvent BeginInteraction2
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lineWidget2 AddObserver EndInteractionEvent GenerateStreamlines2
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# Add the actors to the renderer, set the background and size
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#
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ren1 AddActor outlineActor
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ren1 AddActor streamline
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ren1 AddActor streamline2
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ren1 SetBackground 1 1 1
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renWin SetSize 300 300
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ren1 SetBackground 0.1 0.2 0.4
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set cam1 [ren1 GetActiveCamera]
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$cam1 SetClippingRange 3.95297 50
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$cam1 SetFocalPoint 9.71821 0.458166 29.3999
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$cam1 SetPosition 2.7439 -37.3196 38.7167
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$cam1 SetViewUp -0.16123 0.264271 0.950876
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# render the image
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#
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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renWin Render
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# Prevent the tk window from showing up then start the event loop.
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wm withdraw .
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# Actually generate streamlines.
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proc BeginInteraction {} {
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streamline VisibilityOn
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}
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proc GenerateStreamlines {} {
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lineWidget GetPolyData seeds
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}
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proc BeginInteraction2 {} {
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streamline2 VisibilityOn
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}
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proc GenerateStreamlines2 {} {
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lineWidget2 GetPolyData seeds2
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}
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