# CompassWidget

VTKExamples/Python/Widgets/CompassWidget

### Description

Draws an interactive compass.

- Contributed by Jothy

### Code

CompassWidget.py

    #!/usr/bin/env python

    import vtk

    def main():
        colors = vtk.vtkNamedColors()

        colors.SetColor('bkg', [0.2, 0.3, 0.7, 1.0])

        # sphere
        sphereSource = vtk.vtkSphereSource()
        sphereSource.SetCenter(0.0, 0.0, 0.0)
        sphereSource.SetRadius(4.0)

        mapper = vtk.vtkPolyDataMapper()
        mapper.SetInputConnection(sphereSource.GetOutputPort())

        actor = vtk.vtkActor()
        actor.SetMapper(mapper)

        # a renderer and render window
        renderer = vtk.vtkRenderer()
        renderWindow = vtk.vtkRenderWindow()
        renderWindow.AddRenderer(renderer)

        # an interactor
        renderWindowInteractor = vtk.vtkRenderWindowInteractor()
        renderWindowInteractor.SetRenderWindow(renderWindow)

        # Create the widget and its representation
        compassRepresentation = vtk.vtkCompassRepresentation()

        compassWidget = vtk.vtkCompassWidget()
        compassWidget.SetInteractor(renderWindowInteractor)
        compassWidget.SetRepresentation(compassRepresentation)

        # add the actors to the scene
        renderer.AddActor(actor)
        renderer.SetBackground(colors.GetColor3d('bkg'))
        renderWindow.Render()
        compassWidget.EnabledOn()

        style = vtk.vtkInteractorStyleTrackballCamera()
        renderWindowInteractor.SetInteractorStyle(style)

        # begin interaction
        renderWindowInteractor.Start()
        renderWindow.Render()
        renderWindowInteractor.Initialize()

    if __name__ == '__main__':
        main()