.. _api-scatter_piecharts:

api example code: scatter_piecharts.py
======================================



.. plot:: /media/TOSHI/temp/numpy_scipy_matplotlib/matplotlib/matplotlib-1.1.1~rc2/doc/mpl_examples/api/scatter_piecharts.py

::

    """
    This example makes custom 'pie charts' as the markers for a scatter plotqu
    
    Thanks to Manuel Metz for the example
    """
    import math
    import numpy as np
    import matplotlib.pyplot as plt
    
    # first define the ratios
    r1 = 0.2      # 20%
    r2 = r1 + 0.4 # 40%
    
    # define some sizes of the scatter marker
    sizes = [60,80,120]
    
    # calculate the points of the first pie marker
    #
    # these are just the origin (0,0) +
    # some points on a circle cos,sin
    x = [0] + np.cos(np.linspace(0, 2*math.pi*r1, 10)).tolist()
    y = [0] + np.sin(np.linspace(0, 2*math.pi*r1, 10)).tolist()
    xy1 = zip(x,y)
    
    # ...
    x = [0] + np.cos(np.linspace(2*math.pi*r1, 2*math.pi*r2, 10)).tolist()
    y = [0] + np.sin(np.linspace(2*math.pi*r1, 2*math.pi*r2, 10)).tolist()
    xy2 = zip(x,y)
    
    x = [0] + np.cos(np.linspace(2*math.pi*r2, 2*math.pi, 10)).tolist()
    y = [0] + np.sin(np.linspace(2*math.pi*r2, 2*math.pi, 10)).tolist()
    xy3 = zip(x,y)
    
    
    fig = plt.figure()
    ax = fig.add_subplot(111)
    ax.scatter( np.arange(3), np.arange(3), marker=(xy1,0), s=sizes, facecolor='blue' )
    ax.scatter( np.arange(3), np.arange(3), marker=(xy2,0), s=sizes, facecolor='green' )
    ax.scatter( np.arange(3), np.arange(3), marker=(xy3,0), s=sizes, facecolor='red' )
    plt.show()
    

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