{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "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"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.13.2"
    }
  },
  "nbformat": 4,
  "nbformat_minor": 0
}