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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<h1>api example code: donut_demo.py<a class="headerlink" href="#api-example-code-donut-demo-py" title="Permalink to this headline">¶</a></h1>

(<a class="reference external" href="../../mpl_examples/api/donut_demo.py">Source code</a>, <a class="reference external" href="../../mpl_examples/api/donut_demo.png">png</a>, <a class="reference external" href="../../mpl_examples/api/donut_demo.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/api/donut_demo.pdf">pdf</a>)

</div>

<div class="highlight-python"><div class="highlight"><pre>import numpy as np

import matplotlib.path as mpath

import matplotlib.patches as mpatches

import matplotlib.pyplot as plt

def wise(v):

if v == 1:

return "CCW"

else:

return "CW"

def make_circle(r):

t = np.arange(0, np.pi * 2.0, 0.01)

t = t.reshape((len(t), 1))

x = r * np.cos(t)

y = r * np.sin(t)

return np.hstack((x, y))

Path = mpath.Path

fig, ax = plt.subplots()

inside_vertices = make_circle(0.5)

outside_vertices = make_circle(1.0)

codes = np.ones(

len(inside_vertices), dtype=mpath.Path.code_type) * mpath.Path.LINETO

codes[0] = mpath.Path.MOVETO

for i, (inside, outside) in enumerate(((1, 1), (1, -1), (-1, 1), (-1, -1))):

# Concatenate the inside and outside subpaths together, changing their

# order as needed

vertices = np.concatenate((outside_vertices[::outside],

inside_vertices[::inside]))

# Shift the path

vertices[:, 0] += i * 2.5

# The codes will be all "LINETO" commands, except for "MOVETO"s at the

# beginning of each subpath

all_codes = np.concatenate((codes, codes))

# Create the Path object

path = mpath.Path(vertices, all_codes)

# Add plot it

patch = mpatches.PathPatch(path, facecolor='#885500', edgecolor='black')

ax.add_patch(patch)

ax.annotate("Outside %s,\nInside %s" % (wise(outside), wise(inside)),

(i * 2.5, -1.5), va="top", ha="center")

ax.set_xlim(-2, 10)

ax.set_ylim(-3, 2)

ax.set_title('Mmm, donuts!')

ax.set_aspect(1.0)

plt.show()

</pre></div>

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Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples">Search examples</a>)

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