.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/scene/line_update.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_scene_line_update.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_scene_line_update.py:


Animated Line Visual
====================

Demonstration of animated Line visual.

.. GENERATED FROM PYTHON SOURCE LINES 12-64



.. image-sg:: /gallery/scene/images/sphx_glr_line_update_001.gif
   :alt: line update
   :srcset: /gallery/scene/images/sphx_glr_line_update_001.gif
   :class: sphx-glr-single-img





.. code-block:: Python


    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()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.648 seconds)


.. _sphx_glr_download_gallery_scene_line_update.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: line_update.ipynb <line_update.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: line_update.py <line_update.py>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_