ScalarBarWidget
VTKExamples/Python/Widgets/ScalarBarWidget
Description¶
Display a movable and resizable scalar bar.
An example input file is uGridEx.vtk (folder Data at VTKData).
Code¶
ScalarBarWidget.py
#!/usr/bin/env python # -*- coding: utf-8 -*- # # by Panos Mavrogiorgos, email : pmav99 >a< gmail import vtk # The source file file_name = "uGridEx.vtk" # Create a custom lut. The lut is used both at the mapper and at the # scalar_bar lut = vtk.vtkLookupTable() lut.Build() # Read the source file. reader = vtk.vtkUnstructuredGridReader() reader.SetFileName(file_name) reader.Update() # Needed because of GetScalarRange output = reader.GetOutput() scalar_range = output.GetScalarRange() mapper = vtk.vtkDataSetMapper() if vtk.VTK_MAJOR_VERSION <= 5: mapper.SetInput(output) else: mapper.SetInputData(output) mapper.SetScalarRange(scalar_range) mapper.SetLookupTable(lut) actor = vtk.vtkActor() actor.SetMapper(mapper) renderer = vtk.vtkRenderer() renderer.AddActor(actor) renderer.SetBackground(0.1, 0.2, 0.4) render_window = vtk.vtkRenderWindow() render_window.AddRenderer(renderer) render_window.SetSize(300, 300) interactor = vtk.vtkRenderWindowInteractor() interactor.SetRenderWindow(render_window) # create the scalar_bar scalar_bar = vtk.vtkScalarBarActor() scalar_bar.SetOrientationToHorizontal() scalar_bar.SetLookupTable(lut) # create the scalar_bar_widget scalar_bar_widget = vtk.vtkScalarBarWidget() scalar_bar_widget.SetInteractor(interactor) scalar_bar_widget.SetScalarBarActor(scalar_bar) scalar_bar_widget.On() interactor.Initialize() render_window.Render() interactor.Start()