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140 lines
4.2 KiB
140 lines
4.2 KiB
2 years ago
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#!/usr/bin/env python
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# This example demonstrates how to use the vtkLineWidget to seed and
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# manipulate streamlines. Two line widgets are created. One is invoked
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# by pressing 'i', the other by pressing 'L' (capital). Both can exist
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# together.
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import vtk
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from vtk.util.misc import vtkGetDataRoot
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VTK_DATA_ROOT = vtkGetDataRoot()
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# Start by loading some data.
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pl3d = vtk.vtkPLOT3DReader()
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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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lineWidget = vtk.vtkLineWidget()
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seeds = vtk.vtkPolyData()
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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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rk4 = vtk.vtkRungeKutta4()
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streamer = vtk.vtkStreamLine()
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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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rf = vtk.vtkRibbonFilter()
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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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streamMapper = vtk.vtkPolyDataMapper()
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streamMapper.SetInputConnection(rf.GetOutputPort())
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streamMapper.SetScalarRange(pl3d.GetOutput().GetScalarRange())
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streamline = vtk.vtkActor()
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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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lineWidget2 = vtk.vtkLineWidget()
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seeds2 = vtk.vtkPolyData()
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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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streamer2 = vtk.vtkStreamLine()
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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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rf2 = vtk.vtkRibbonFilter()
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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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streamMapper2 = vtk.vtkPolyDataMapper()
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streamMapper2.SetInputConnection(rf2.GetOutputPort())
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streamMapper2.SetScalarRange(pl3d.GetOutput().GetScalarRange())
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streamline2 = vtk.vtkActor()
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streamline2.SetMapper(streamMapper2)
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streamline2.VisibilityOff()
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outline = vtk.vtkStructuredGridOutlineFilter()
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outline.SetInputConnection(pl3d.GetOutputPort())
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outlineMapper = vtk.vtkPolyDataMapper()
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outlineMapper.SetInputConnection(outline.GetOutputPort())
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outlineActor = vtk.vtkActor()
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outlineActor.SetMapper(outlineMapper)
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# Create the RenderWindow, Renderer and both Actors
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ren = vtk.vtkRenderer()
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer(ren)
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iren = vtk.vtkRenderWindowInteractor()
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iren.SetRenderWindow(renWin)
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# Callback functions that actually generate streamlines.
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def BeginInteraction(obj, event):
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global streamline
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streamline.VisibilityOn()
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def GenerateStreamlines(obj, event):
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global seeds, renWin
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obj.GetPolyData(seeds)
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renWin.Render()
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def BeginInteraction2(obj, event):
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global streamline2
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streamline2.VisibilityOn()
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def GenerateStreamlines2(obj, event):
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global seeds2, renWin
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obj.GetPolyData(seeds2)
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renWin.Render()
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# Associate the line widget with the interactor and setup callbacks.
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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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ren.AddActor(outlineActor)
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ren.AddActor(streamline)
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ren.AddActor(streamline2)
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ren.SetBackground(1, 1, 1)
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renWin.SetSize(300, 300)
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ren.SetBackground(0.1, 0.2, 0.4)
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cam1 = ren.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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iren.Initialize()
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renWin.Render()
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iren.Start()
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