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

.. only:: html

    .. meta::
        :keywords: codex

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

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

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

.. _sphx_glr_gallery_animation_strip_chart.py:


============
Oscilloscope
============

Emulates an oscilloscope.

Output generated via `matplotlib.animation.Animation.to_jshtml`.

.. GENERATED FROM PYTHON SOURCE LINES 10-72



.. image-sg:: /gallery/animation/images/sphx_glr_strip_chart_001.png
   :alt: strip chart
   :srcset: /gallery/animation/images/sphx_glr_strip_chart_001.png, /gallery/animation/images/sphx_glr_strip_chart_001_2_00x.png 2.00x
   :class: sphx-glr-single-img





.. code-block:: Python


    import matplotlib.pyplot as plt
    import numpy as np

    import matplotlib.animation as animation
    from matplotlib.lines import Line2D


    class Scope:
        def __init__(self, ax, maxt=2, dt=0.02):
            self.ax = ax
            self.dt = dt
            self.maxt = maxt
            self.tdata = [0]
            self.ydata = [0]
            self.line = Line2D(self.tdata, self.ydata)
            self.ax.add_line(self.line)
            self.ax.set_ylim(-.1, 1.1)
            self.ax.set_xlim(0, self.maxt)

        def update(self, y):
            lastt = self.tdata[-1]
            if lastt >= self.tdata[0] + self.maxt:  # reset the arrays
                self.tdata = [self.tdata[-1]]
                self.ydata = [self.ydata[-1]]
                self.ax.set_xlim(self.tdata[0], self.tdata[0] + self.maxt)
                self.ax.figure.canvas.draw()

            # This slightly more complex calculation avoids floating-point issues
            # from just repeatedly adding `self.dt` to the previous value.
            t = self.tdata[0] + len(self.tdata) * self.dt

            self.tdata.append(t)
            self.ydata.append(y)
            self.line.set_data(self.tdata, self.ydata)
            return self.line,


    def emitter(p=0.1):
        """Return a random value in [0, 1) with probability p, else 0."""
        while True:
            v = np.random.rand()
            if v > p:
                yield 0.
            else:
                yield np.random.rand()


    # Fixing random state for reproducibility
    np.random.seed(19680801 // 10)


    fig, ax = plt.subplots()
    scope = Scope(ax)

    # pass a generator in "emitter" to produce data for the update func
    ani = animation.FuncAnimation(fig, scope.update, emitter, interval=50,
                                  blit=True, save_count=100)

    plt.show()

    # ..tags:: animation, plot-type: line


.. _sphx_glr_download_gallery_animation_strip_chart.py:

.. only:: html

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

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

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

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

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: strip_chart.zip <strip_chart.zip>`


.. only:: html

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

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