{
  "cells": [
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      "cell_type": "markdown",
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      "source": [
        "\n# Buttons\n\nConstructing a simple button GUI to modify a sine wave.\n\nThe ``next`` and ``previous`` button widget helps visualize the wave with\nnew frequencies.\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "import matplotlib.pyplot as plt\nimport numpy as np\n\nfrom matplotlib.widgets import Button\n\nfreqs = np.arange(2, 20, 3)\n\nfig, ax = plt.subplots()\nfig.subplots_adjust(bottom=0.2)\nt = np.arange(0.0, 1.0, 0.001)\ns = np.sin(2*np.pi*freqs[0]*t)\nl, = ax.plot(t, s, lw=2)\n\n\nclass Index:\n    ind = 0\n\n    def next(self, event):\n        self.ind += 1\n        i = self.ind % len(freqs)\n        ydata = np.sin(2*np.pi*freqs[i]*t)\n        l.set_ydata(ydata)\n        plt.draw()\n\n    def prev(self, event):\n        self.ind -= 1\n        i = self.ind % len(freqs)\n        ydata = np.sin(2*np.pi*freqs[i]*t)\n        l.set_ydata(ydata)\n        plt.draw()\n\ncallback = Index()\naxprev = fig.add_axes((0.7, 0.05, 0.1, 0.075))\naxnext = fig.add_axes((0.81, 0.05, 0.1, 0.075))\nbnext = Button(axnext, 'Next')\nbnext.on_clicked(callback.next)\nbprev = Button(axprev, 'Previous')\nbprev.on_clicked(callback.prev)\n\nplt.show()"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        ".. admonition:: References\n\n   The use of the following functions, methods, classes and modules is shown\n   in this example:\n\n   - `matplotlib.widgets.Button`\n\n"
      ]
    }
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