.. 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_widgets_buttons.py: ======= Buttons ======= Constructing a simple button GUI to modify a sine wave. The ``next`` and ``previous`` button widget helps visualize the wave with new frequencies. .. image:: /gallery/widgets/images/sphx_glr_buttons_001.png :class: sphx-glr-single-img .. code-block:: python import numpy as np import matplotlib.pyplot as plt from matplotlib.widgets import Button freqs = np.arange(2, 20, 3) fig, ax = plt.subplots() plt.subplots_adjust(bottom=0.2) t = np.arange(0.0, 1.0, 0.001) s = np.sin(2*np.pi*freqs[0]*t) l, = plt.plot(t, s, lw=2) class Index(object): ind = 0 def next(self, event): self.ind += 1 i = self.ind % len(freqs) ydata = np.sin(2*np.pi*freqs[i]*t) l.set_ydata(ydata) plt.draw() def prev(self, event): self.ind -= 1 i = self.ind % len(freqs) ydata = np.sin(2*np.pi*freqs[i]*t) l.set_ydata(ydata) plt.draw() callback = Index() axprev = plt.axes([0.7, 0.05, 0.1, 0.075]) axnext = plt.axes([0.81, 0.05, 0.1, 0.075]) bnext = Button(axnext, 'Next') bnext.on_clicked(callback.next) bprev = Button(axprev, 'Previous') bprev.on_clicked(callback.prev) plt.show() .. _sphx_glr_download_gallery_widgets_buttons.py: .. only :: html .. container:: sphx-glr-footer :class: sphx-glr-footer-example .. container:: sphx-glr-download :download:`Download Python source code: buttons.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: buttons.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature Keywords: matplotlib code example, codex, python plot, pyplot `Gallery generated by Sphinx-Gallery `_