.. _old_animation-animation_blit_gtk:

old_animation example code: animation_blit_gtk.py
=================================================

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

::

    #!/usr/bin/env python
    
    from __future__ import print_function
    
    # For detailed comments on animation and the techniques used here, see
    # the wiki entry
    # http://www.scipy.org/wikis/topical_software/MatplotlibAnimation
    import time
    
    import gtk, gobject
    
    import matplotlib
    matplotlib.use('GTKAgg')
    
    import numpy as np
    import matplotlib.pyplot as plt
    
    
    fig, ax = plt.subplots()
    canvas = fig.canvas
    
    fig.subplots_adjust(left=0.3, bottom=0.3) # check for flipy bugs
    ax.grid() # to ensure proper background restore
    
    # create the initial line
    x = np.arange(0,2*np.pi,0.01)
    line, = ax.plot(x, np.sin(x), animated=True, lw=2)
    canvas.draw()
    
    # for profiling
    tstart = time.time()
    
    def update_line(*args):
        print('you are here', update_line.cnt)
        if update_line.background is None:
            update_line.background = canvas.copy_from_bbox(ax.bbox)
    
        # restore the clean slate background
        canvas.restore_region(update_line.background)
        # update the data
        line.set_ydata(np.sin(x+update_line.cnt/10.0))
        # just draw the animated artist
        ax.draw_artist(line)
    
        # just redraw the axes rectangle
        canvas.blit(ax.bbox)
    
        if update_line.cnt==1000:
            # print the timing info and quit
            print('FPS:' , 1000/(time.time()-tstart))
            gtk.mainquit()
            raise SystemExit
    
        update_line.cnt += 1
        return True
    
    update_line.cnt = 0
    update_line.background = None
    
    
    def start_anim(event):
        gobject.idle_add(update_line)
        canvas.mpl_disconnect(start_anim.cid)
    
    start_anim.cid = canvas.mpl_connect('draw_event', start_anim)
    
    
    
    plt.show()
    

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