00001 """ This example shows how to use a path patch to draw a bunch of rectangles. The technique of using lots of Rectangle instances, or the faster method of using PolyCollections, were implemented before we had proper paths with moveto/lineto, closepoly etc in mpl. Now that we have them, we can draw collections of regularly shaped objects with homogeous properties more efficiently with a PathCollection. This example makes a histogram -- its more work to set up the vertex arrays at the outset, but it should be much faster for large numbers of objects """ import numpy as np import matplotlib.pyplot as plt import matplotlib.patches as patches import matplotlib.path as path fig = plt.figure() ax = fig.add_subplot(111) # histogram our data with numpy data = np.random.randn(1000) n, bins = np.histogram(data, 50) # get the corners of the rectangles for the histogram left = np.array(bins[:-1]) right = np.array(bins[1:]) bottom = np.zeros(len(left)) top = bottom + n # we need a (numrects x numsides x 2) numpy array for the path helper # function to build a compound path XY = np.array([[left,left,right,right], [bottom,top,top,bottom]]).T # get the Path object barpath = path.Path.make_compound_path_from_polys(XY) # make a patch out of it patch = patches.PathPatch(barpath, facecolor='blue', edgecolor='gray', alpha=0.8) ax.add_patch(patch) # update the view limits ax.set_xlim(left[0], right[-1]) ax.set_ylim(bottom.min(), top.max()) plt.show()

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