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# ViewBox with Clipping Methods

Demonstrate ViewBox using various clipping methods.

    SubScene [NullTransform]
      +--Widget [STTransform]
      |  +--Grid [STTransform]
      |     +--ViewBox: "vb1" [STTransform]
      |        +--SubScene: "vb1_Scene" [MatrixTransform]
      |           +--BaseCamera [NullTransform]
      |           +--PanZoomCamera [STTransform]
      |           +--Line: "line1" [NullTransform]
      |           +--Line: "unit box" [NullTransform]
      |           +--Line: "nd box" [NullTransform]
      +--ViewBox: "vb2" [STTransform]
         +--SubScene: "vb2_Scene" [ChainTransform]
            +--BaseCamera [NullTransform]
            +--TurntableCamera [MatrixTransform]
            +--Line: "line1" [NullTransform]
            +--Line: "unit box" [NullTransform]
            +--Line: "nd box" [NullTransform]
            +--Line: "unit box" [NullTransform]
            +--Line: "nd box" [NullTransform]

    import sys
    import numpy as np

    from vispy import app
    from vispy import scene

    # Create canvas
    canvas = scene.SceneCanvas(size=(800, 600), show=True, keys='interactive')
    grid = canvas.central_widget.add_grid()

    # Create two ViewBoxes, place side-by-side
    vb1 = grid.add_view(name='vb1', border_color='yellow')
    # First ViewBox uses a 2D pan/zoom camera
    vb1.camera = 'panzoom'

    # Second ViewBox uses a 3D perspective camera
    vb2 = grid.add_view(name='vb2', border_color='yellow')
    vb2.parent = canvas.scene
    vb2.camera = scene.TurntableCamera(elevation=30, azimuth=30, up='+y')

    #
    # Now add visuals to the viewboxes.
    #

    # First a plot line:
    N = 1000
    color = np.ones((N, 4), dtype=np.float32)
    color[:, 0] = np.linspace(0, 1, N)
    color[:, 1] = color[::-1, 0]

    pos = np.empty((N, 2), np.float32)
    pos[:, 0] = np.linspace(-1., 1., N)
    pos[:, 1] = np.random.normal(0.0, 0.5, size=N)
    pos[:20, 1] = -0.5  # So we can see which side is down

    # make a single plot line and display in both viewboxes
    line1 = scene.visuals.Line(pos=pos.copy(), color=color, method='gl',
                               antialias=False, name='line1', parent=vb1.scene)
    line2 = scene.visuals.Line(pos=pos.copy(), color=color, method='gl',
                               antialias=False, name='line1', parent=vb2.scene)

    # And some squares:
    box = np.array([[0, 0, 0],
                    [0, 1, 0],
                    [1, 1, 0],
                    [1, 0, 0],
                    [0, 0, 0]], dtype=np.float32)
    z = np.array([[0, 0, 1]], dtype=np.float32)

    # First two boxes are added to both views
    box1 = scene.visuals.Line(pos=box, color=(0.7, 0, 0, 1), method='gl',
                              name='unit box', parent=vb1.scene)
    box2 = scene.visuals.Line(pos=box, color=(0.7, 0, 0, 1), method='gl',
                              name='unit box', parent=vb2.scene)

    box2 = scene.visuals.Line(pos=(box * 2 - 1), color=(0, 0.7, 0, 1),
                              method='gl', name='nd box', parent=vb1.scene)
    box3 = scene.visuals.Line(pos=(box * 2 - 1), color=(0, 0.7, 0, 1),
                              method='gl', name='nd box', parent=vb2.scene)

    # These boxes are only added to the 3D view.
    box3 = scene.visuals.Line(pos=box + z, color=(1, 0, 0, 1),
                              method='gl', name='unit box', parent=vb2.scene)
    box5 = scene.visuals.Line(pos=((box + z) * 2 - 1), color=(0, 1, 0, 1),
                              method='gl', name='nd box', parent=vb2.scene)

    if __name__ == '__main__' and sys.flags.interactive == 0:
        print(canvas.scene.describe_tree(with_transform=True))
        app.run()

Total running time of the script: (0 minutes 0.734 seconds)

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