.. _pylab_examples-contourf_hatching:

pylab_examples example code: contourf_hatching.py
=================================================



.. plot:: /home/mdboom/Work/builds/matplotlib/doc/mpl_examples/pylab_examples/contourf_hatching.py

::

    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()
    

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