Make a simple gif movie
-----------------------

.. plot::
    :include-source:
    :context: reset
    :nofigs:

    import numpy as np
    import matplotlib.pyplot as plt
    from matplotlib import animation

    import deltametrics as dm

    def update_field(i):
        im.set_data(golf['eta'][i, :, :])

    golf = dm.sample_data.golf()

    time_idxs = np.arange(0, golf.shape[0]-1)

    cmap, norm = dm.plot.cartographic_colormap(H_SL=0.0, h=4.5, n=1.0)

    fig, ax = plt.subplots()
    im = ax.imshow(
        golf['eta'][0, :, :],
        extent=golf.extent,
        cmap=cmap, norm=norm
        )

Then, make the animation with matplotlib's `FuncAnimation`.

.. plot::
    :context:
    :nofigs:

    anim = animation.FuncAnimation(
        fig, update_field,
        frames=golf.shape[0]-1,
        interval=20,
        blit=False)
    anim.save('../../../../build/plot_directive/guides/examples/plot/simple_movie.gif', fps=30)

    plt.show()

.. code::
    
    anim = animation.FuncAnimation(
        fig, update_field,
        frames=golf.shape[0]-1,
        interval=20)
    anim.save('simple_movie.gif', fps=30)

    plt.show()

An view the gif:

.. image:: ../../../../build/plot_directive/guides/examples/plot/simple_movie.gif