55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
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import numpy as np
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import matplotlib.path as mpath
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import matplotlib.patches as mpatches
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import matplotlib.pyplot as plt
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def wise(v):
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if v == 1:
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return "CCW"
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else:
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return "CW"
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def make_circle(r):
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t = np.arange(0, np.pi * 2.0, 0.01)
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t = t.reshape((len(t), 1))
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x = r * np.cos(t)
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y = r * np.sin(t)
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return np.hstack((x, y))
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Path = mpath.Path
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fig = plt.figure()
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ax = fig.add_subplot(111)
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inside_vertices = make_circle(0.5)
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outside_vertices = make_circle(1.0)
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codes = np.ones(len(inside_vertices), dtype=mpath.Path.code_type) * mpath.Path.LINETO
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codes[0] = mpath.Path.MOVETO
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for i, (inside, outside) in enumerate(((1, 1), (1, -1), (-1, 1), (-1, -1))):
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# Concatenate the inside and outside subpaths together, changing their
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# order as needed
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vertices = np.concatenate((outside_vertices[::outside],
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inside_vertices[::inside]))
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# Shift the path
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vertices[:, 0] += i * 2.5
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# The codes will be all "LINETO" commands, except for "MOVETO"s at the
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# beginning of each subpath
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all_codes = np.concatenate((codes, codes))
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# Create the Path object
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path = mpath.Path(vertices, all_codes)
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# Add plot it
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patch = mpatches.PathPatch(path, facecolor='#885500', edgecolor='black')
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ax.add_patch(patch)
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ax.annotate("Outside %s,\nInside %s" % (wise(outside), wise(inside)),
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(i * 2.5, -1.5), va="top", ha="center")
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ax.set_xlim(-2,10)
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ax.set_ylim(-3,2)
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ax.set_title('Mmm, donuts!')
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ax.set_aspect(1.0)
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plt.show()
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