.. _widgets-slider_demo:

widgets example code: slider_demo.py
====================================

[`source code <slider_demo.py>`_]

::

    import numpy as np
    import matplotlib.pyplot as plt
    from matplotlib.widgets import Slider, Button, RadioButtons
    
    fig, ax = plt.subplots()
    plt.subplots_adjust(left=0.25, bottom=0.25)
    t = np.arange(0.0, 1.0, 0.001)
    a0 = 5
    f0 = 3
    s = a0*np.sin(2*np.pi*f0*t)
    l, = plt.plot(t, s, lw=2, color='red')
    plt.axis([0, 1, -10, 10])
    
    axcolor = 'lightgoldenrodyellow'
    axfreq = plt.axes([0.25, 0.1, 0.65, 0.03], axisbg=axcolor)
    axamp = plt.axes([0.25, 0.15, 0.65, 0.03], axisbg=axcolor)
    
    sfreq = Slider(axfreq, 'Freq', 0.1, 30.0, valinit=f0)
    samp = Slider(axamp, 'Amp', 0.1, 10.0, valinit=a0)
    
    
    def update(val):
        amp = samp.val
        freq = sfreq.val
        l.set_ydata(amp*np.sin(2*np.pi*freq*t))
        fig.canvas.draw_idle()
    sfreq.on_changed(update)
    samp.on_changed(update)
    
    resetax = plt.axes([0.8, 0.025, 0.1, 0.04])
    button = Button(resetax, 'Reset', color=axcolor, hovercolor='0.975')
    
    
    def reset(event):
        sfreq.reset()
        samp.reset()
    button.on_clicked(reset)
    
    rax = plt.axes([0.025, 0.5, 0.15, 0.15], axisbg=axcolor)
    radio = RadioButtons(rax, ('red', 'blue', 'green'), active=0)
    
    
    def colorfunc(label):
        l.set_color(label)
        fig.canvas.draw_idle()
    radio.on_clicked(colorfunc)
    
    plt.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)