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# Contourf Hatching

    import matplotlib.pyplot as plt
    import numpy as np

    # invent some numbers, turning the x and y arrays into simple
    # 2d arrays, which make combining them together easier.
    x = np.linspace(-3, 5, 150).reshape(1, -1)
    y = np.linspace(-3, 5, 120).reshape(-1, 1)
    z = np.cos(x) + np.sin(y)

    # we no longer need x and y to be 2 dimensional, so flatten them.
    x, y = x.flatten(), y.flatten()

    # ---------------------------------------------
    # |                 Plot #1                   |
    # ---------------------------------------------
    # the simplest hatched plot with a colorbar
    fig = plt.figure()
    cs = plt.contourf(x, y, z, hatches=['-', '/', '\\', '//'],
                      cmap=plt.get_cmap('gray'),
                      extend='both', alpha=0.5
                      )
    plt.colorbar()

    # ---------------------------------------------
    # |                 Plot #2                   |
    # ---------------------------------------------
    # a plot of hatches without color with a legend
    plt.figure()
    n_levels = 6
    plt.contour(x, y, z, n_levels, colors='black', linestyles='-')
    cs = plt.contourf(x, y, z, n_levels, colors='none',
                      hatches=['.', '/', '\\', None, '\\\\', '*'],
                      extend='lower'
                      )

    # create a legend for the contour set
    artists, labels = cs.legend_elements()
    plt.legend(artists, labels, handleheight=2)

    plt.show()

Total running time of the script: ( 0 minutes 0.239 seconds)

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