.. note:: :class: sphx-glr-download-link-note Click :ref:`here ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_animation_strip_chart.py: ============ Oscilloscope ============ Emulates an oscilloscope. .. image:: /gallery/animation/images/sphx_glr_strip_chart_001.png :class: sphx-glr-single-img .. code-block:: python import numpy as np from matplotlib.lines import Line2D import matplotlib.pyplot as plt import matplotlib.animation as animation class Scope(object): 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() t = self.tdata[-1] + self.dt self.tdata.append(t) self.ydata.append(y) self.line.set_data(self.tdata, self.ydata) return self.line, def emitter(p=0.03): 'return a random value with probability p, else 0' while True: v = np.random.rand(1) if v > p: yield 0. else: yield np.random.rand(1) # Fixing random state for reproducibility np.random.seed(19680801) 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=10, blit=True) plt.show() .. _sphx_glr_download_gallery_animation_strip_chart.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:`Download Python source code: strip_chart.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: strip_chart.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_