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# Animated Line Visual

Demonstration of animated Line visual.

    import sys
    import numpy as np
    from vispy import app, scene

    # vertex positions of data to draw
    N = 200
    pos = np.zeros((N, 2), dtype=np.float32)
    x_lim = [50., 750.]
    y_lim = [-2., 2.]
    pos[:, 0] = np.linspace(x_lim[0], x_lim[1], N)
    pos[:, 1] = np.random.normal(size=N)

    # color array
    color = np.ones((N, 4), dtype=np.float32)
    color[:, 0] = np.linspace(0, 1, N)
    color[:, 1] = color[::-1, 0]

    canvas = scene.SceneCanvas(keys='interactive', show=True)
    grid = canvas.central_widget.add_grid(spacing=0)

    viewbox = grid.add_view(row=0, col=1, camera='panzoom')

    # add some axes
    x_axis = scene.AxisWidget(orientation='bottom')
    x_axis.stretch = (1, 0.1)
    grid.add_widget(x_axis, row=1, col=1)
    x_axis.link_view(viewbox)
    y_axis = scene.AxisWidget(orientation='left')
    y_axis.stretch = (0.1, 1)
    grid.add_widget(y_axis, row=0, col=0)
    y_axis.link_view(viewbox)

    # add a line plot inside the viewbox
    line = scene.Line(pos, color, parent=viewbox.scene)

    # auto-scale to see the whole line.
    viewbox.camera.set_range()

    def update(ev):
        global pos, color, line
        pos[:, 1] = np.random.normal(size=N)
        color = np.roll(color, 1, axis=0)
        line.set_data(pos=pos, color=color)

    timer = app.Timer()
    timer.connect(update)
    timer.start(0)

    if __name__ == '__main__' and sys.flags.interactive == 0:
        app.run()

Total running time of the script: ( 0 minutes 2.525 seconds)

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