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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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<title>Buttons — Matplotlib 2.2.4 documentation</title>

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<div id="unreleased-message"> You are reading an old version of the documentation (v2.2.4). For the latest version see <a href="https://matplotlib.org/stable/gallery/widgets/buttons.html">https://matplotlib.org/stable/gallery/widgets/buttons.html</a></div>

<div style="float: left; position: absolute; width: 496px; bottom: 0; padding-bottom: 24px">Version 2.2.4</div>

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Note

Click <a class="reference internal" href="#sphx-glr-download-gallery-widgets-buttons-py">here</a> to download the full example code

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<h1>Buttons<a class="headerlink" href="#buttons" title="Permalink to this headline">¶</a></h1>

Constructing a simple button GUI to modify a sine wave.

The <code class="docutils literal notranslate">next</code> and <code class="docutils literal notranslate">previous</code> button widget helps visualize the wave with

new frequencies.

<div class="highlight-python notranslate"><div class="highlight"><pre>import numpy as np

import matplotlib.pyplot as plt

from matplotlib.widgets import <a href="../../api/widgets_api.html#matplotlib.widgets.Button" title="View documentation for matplotlib.widgets.Button">Button</a>

freqs = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html#numpy.arange" title="View documentation for numpy.arange">np.arange</a>(2, 20, 3)

fig, ax = <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots">plt.subplots</a>()

<a href="../../api/_as_gen/matplotlib.pyplot.subplots_adjust.html#matplotlib.pyplot.subplots_adjust" title="View documentation for matplotlib.pyplot.subplots_adjust">plt.subplots_adjust</a>(bottom=0.2)

t = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html#numpy.arange" title="View documentation for numpy.arange">np.arange</a>(0.0, 1.0, 0.001)

s = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.sin.html#numpy.sin" title="View documentation for numpy.sin">np.sin</a>(2*<a href="https://docs.scipy.org/doc/numpy/reference/constants.html#numpy.pi" title="View documentation for numpy.pi">np.pi</a>*freqs[0]*t)

l, = <a href="../../api/_as_gen/matplotlib.pyplot.plot.html#matplotlib.pyplot.plot" title="View documentation for matplotlib.pyplot.plot">plt.plot</a>(t, s, lw=2)

class Index(object):

ind = 0

def next(self, event):

self.ind += 1

i = self.ind % len(freqs)

ydata = <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.sin.html#numpy.sin" title="View documentation for numpy.sin">np.sin</a>(2*<a href="https://docs.scipy.org/doc/numpy/reference/constants.html#numpy.pi" title="View documentation for numpy.pi">np.pi</a>*freqs[i]*t)

l.set_ydata(ydata)

<a href="../../api/_as_gen/matplotlib.pyplot.draw.html#matplotlib.pyplot.draw" title="View documentation for matplotlib.pyplot.draw">plt.draw</a>()

def prev(self, event):

self.ind -= 1

l.set_ydata(ydata)

callback = Index()

axprev = <a href="../../api/_as_gen/matplotlib.pyplot.axes.html#matplotlib.pyplot.axes" title="View documentation for matplotlib.pyplot.axes">plt.axes</a>([0.7, 0.05, 0.1, 0.075])

axnext = <a href="../../api/_as_gen/matplotlib.pyplot.axes.html#matplotlib.pyplot.axes" title="View documentation for matplotlib.pyplot.axes">plt.axes</a>([0.81, 0.05, 0.1, 0.075])

bnext = <a href="../../api/widgets_api.html#matplotlib.widgets.Button" title="View documentation for matplotlib.widgets.Button">Button</a>(axnext, 'Next')

bnext.on_clicked(callback.next)

bprev = <a href="../../api/widgets_api.html#matplotlib.widgets.Button" title="View documentation for matplotlib.widgets.Button">Button</a>(axprev, 'Previous')

bprev.on_clicked(callback.prev)

<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show">plt.show</a>()

</pre></div>

</div>

<a class="reference download internal" download="" href="../../_downloads/2ed5f548cdb449505f1509de60e03a27/buttons.py"><code class="xref download docutils literal notranslate">Download Python source code: buttons.py</code></a></div>

<a class="reference download internal" download="" href="../../_downloads/3d6bba3b9ec27336f8b3d42f8d095bef/buttons.ipynb"><code class="xref download docutils literal notranslate">Download Jupyter notebook: buttons.ipynb</code></a></div>

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Keywords: matplotlib code example, codex, python plot, pyplot

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matplotlib.github.com/2.2.4/gallery/widgets/buttons.html at main · matplotlib/matplotlib.github.com · GitHub

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