/usr/share/vtk/GUI/Python/StreamlinesWithLineWidget.py is in vtk-examples 5.8.0-17.5.
This file is owned by root:root, with mode 0o755.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | #!/usr/bin/env python
# This example demonstrates how to use the vtkLineWidget to seed and
# manipulate streamlines. Two line widgets are created. One is invoked
# by pressing 'i', the other by pressing 'L' (capital). Both can exist
# together.
import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Start by loading some data.
pl3d = vtk.vtkPLOT3DReader()
pl3d.SetXYZFileName(VTK_DATA_ROOT + "/Data/combxyz.bin")
pl3d.SetQFileName(VTK_DATA_ROOT + "/Data/combq.bin")
pl3d.SetScalarFunctionNumber(100)
pl3d.SetVectorFunctionNumber(202)
pl3d.Update()
# The line widget is used seed the streamlines.
lineWidget = vtk.vtkLineWidget()
seeds = vtk.vtkPolyData()
lineWidget.SetInput(pl3d.GetOutput())
lineWidget.SetAlignToYAxis()
lineWidget.PlaceWidget()
lineWidget.GetPolyData(seeds)
lineWidget.ClampToBoundsOn()
rk4 = vtk.vtkRungeKutta4()
streamer = vtk.vtkStreamLine()
streamer.SetInputConnection(pl3d.GetOutputPort())
streamer.SetSource(seeds)
streamer.SetMaximumPropagationTime(100)
streamer.SetIntegrationStepLength(.2)
streamer.SetStepLength(.001)
streamer.SetNumberOfThreads(1)
streamer.SetIntegrationDirectionToForward()
streamer.VorticityOn()
streamer.SetIntegrator(rk4)
rf = vtk.vtkRibbonFilter()
rf.SetInputConnection(streamer.GetOutputPort())
rf.SetWidth(0.1)
rf.SetWidthFactor(5)
streamMapper = vtk.vtkPolyDataMapper()
streamMapper.SetInputConnection(rf.GetOutputPort())
streamMapper.SetScalarRange(pl3d.GetOutput().GetScalarRange())
streamline = vtk.vtkActor()
streamline.SetMapper(streamMapper)
streamline.VisibilityOff()
# The second line widget is used seed more streamlines.
lineWidget2 = vtk.vtkLineWidget()
seeds2 = vtk.vtkPolyData()
lineWidget2.SetInput(pl3d.GetOutput())
lineWidget2.PlaceWidget()
lineWidget2.GetPolyData(seeds2)
lineWidget2.SetKeyPressActivationValue('L')
streamer2 = vtk.vtkStreamLine()
streamer2.SetInputConnection(pl3d.GetOutputPort())
streamer2.SetSource(seeds2)
streamer2.SetMaximumPropagationTime(100)
streamer2.SetIntegrationStepLength(.2)
streamer2.SetStepLength(.001)
streamer2.SetNumberOfThreads(1)
streamer2.SetIntegrationDirectionToForward()
streamer2.VorticityOn()
streamer2.SetIntegrator(rk4)
rf2 = vtk.vtkRibbonFilter()
rf2.SetInputConnection(streamer2.GetOutputPort())
rf2.SetWidth(0.1)
rf2.SetWidthFactor(5)
streamMapper2 = vtk.vtkPolyDataMapper()
streamMapper2.SetInputConnection(rf2.GetOutputPort())
streamMapper2.SetScalarRange(pl3d.GetOutput().GetScalarRange())
streamline2 = vtk.vtkActor()
streamline2.SetMapper(streamMapper2)
streamline2.VisibilityOff()
outline = vtk.vtkStructuredGridOutlineFilter()
outline.SetInputConnection(pl3d.GetOutputPort())
outlineMapper = vtk.vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())
outlineActor = vtk.vtkActor()
outlineActor.SetMapper(outlineMapper)
# Create the RenderWindow, Renderer and both Actors
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Callback functions that actually generate streamlines.
def BeginInteraction(obj, event):
global streamline
streamline.VisibilityOn()
def GenerateStreamlines(obj, event):
global seeds, renWin
obj.GetPolyData(seeds)
renWin.Render()
def BeginInteraction2(obj, event):
global streamline2
streamline2.VisibilityOn()
def GenerateStreamlines2(obj, event):
global seeds2, renWin
obj.GetPolyData(seeds2)
renWin.Render()
# Associate the line widget with the interactor and setup callbacks.
lineWidget.SetInteractor(iren)
lineWidget.AddObserver("StartInteractionEvent", BeginInteraction)
lineWidget.AddObserver("InteractionEvent", GenerateStreamlines)
lineWidget2.SetInteractor(iren)
lineWidget2.AddObserver("StartInteractionEvent", BeginInteraction2)
lineWidget2.AddObserver("EndInteractionEvent", GenerateStreamlines2)
# Add the actors to the renderer, set the background and size
ren.AddActor(outlineActor)
ren.AddActor(streamline)
ren.AddActor(streamline2)
ren.SetBackground(1, 1, 1)
renWin.SetSize(300, 300)
ren.SetBackground(0.1, 0.2, 0.4)
cam1 = ren.GetActiveCamera()
cam1.SetClippingRange(3.95297, 50)
cam1.SetFocalPoint(9.71821, 0.458166, 29.3999)
cam1.SetPosition(2.7439, -37.3196, 38.7167)
cam1.SetViewUp(-0.16123, 0.264271, 0.950876)
iren.Initialize()
renWin.Render()
iren.Start()
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