.. _animation-moviewriter:

animation example code: moviewriter.py
======================================

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

::

    """
    ===========
    MovieWriter
    ===========
    
    This example uses a MovieWriter directly to grab individual frames and write
    them to a file. This avoids any event loop integration, but has the advantage
    of working with even the Agg backend. This is not recommended for use in an
    interactive setting.
    
    """
    # -*- noplot -*-
    
    import numpy as np
    import matplotlib
    matplotlib.use("Agg")
    import matplotlib.pyplot as plt
    import matplotlib.animation as manimation
    
    FFMpegWriter = manimation.writers['ffmpeg']
    metadata = dict(title='Movie Test', artist='Matplotlib',
                    comment='Movie support!')
    writer = FFMpegWriter(fps=15, metadata=metadata)
    
    fig = plt.figure()
    l, = plt.plot([], [], 'k-o')
    
    plt.xlim(-5, 5)
    plt.ylim(-5, 5)
    
    x0, y0 = 0, 0
    
    with writer.saving(fig, "writer_test.mp4", 100):
        for i in range(100):
            x0 += 0.1 * np.random.randn()
            y0 += 0.1 * np.random.randn()
            l.set_data(x0, y0)
            writer.grab_frame()
    

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