# BoxWidget

VTKExamples/Python/Widgets/BoxWidget

### Description

An example that shows how to use the BoxWidget to interactively scale and rotate and object.

### Code

BoxWidget.py

    import vtk

    # Call back function to resize the cone

    def boxCallback(obj, event):
        t = vtk.vtkTransform()
        obj.GetTransform(t)
        obj.GetProp3D().SetUserTransform(t)

    # Create a Cone
    cone = vtk.vtkConeSource()
    cone.SetResolution(20)
    coneMapper = vtk.vtkPolyDataMapper()
    coneMapper.SetInputConnection(cone.GetOutputPort())
    coneActor = vtk.vtkActor()
    coneActor.SetMapper(coneMapper)

    # A renderer and render window
    renderer = vtk.vtkRenderer()
    renderer.SetBackground(0, 0, 1)
    renderer.AddActor(coneActor)

    renwin = vtk.vtkRenderWindow()
    renwin.AddRenderer(renderer)

    # An interactor
    interactor = vtk.vtkRenderWindowInteractor()
    interactor.SetRenderWindow(renwin)

    # A Box widget
    boxWidget = vtk.vtkBoxWidget()
    boxWidget.SetInteractor(interactor)
    boxWidget.SetProp3D(coneActor)
    boxWidget.SetPlaceFactor(1.25)  # Make the box 1.25x larger than the actor
    boxWidget.PlaceWidget()
    boxWidget.On()

    # Connect the event to a function
    boxWidget.AddObserver("InteractionEvent", boxCallback)

    # Start
    interactor.Initialize()
    interactor.Start()