I'm always glad to see that old chestnut resurface, but it doesn't
really address the need for a hole in the middle. (I'm sure the
dolphins are very happy about that...)
matplotlib paths use the "non-zero" filling rule, so the directionality
of the path affects filling. The best concise description I know of is
here:
http://www.w3.org/TR/SVG/painting.html#FillProperties
So the direction of the inside and outside paths must be different in
order to create donut-like shapes.
I've added donut_demo.py to the examples (add attached it here).
Hope that helps.
Cheers,
Mike
Alan G Isaac wrote:
Paul Novak wrote:
Are there any more examples of matplotlib's new path functionality, in
addition to the one in examples/api/path_patch_demo.py?
http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg07706.html
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Space Telescope Science Institute
Operated by AURA for NASA
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 = plt.figure()
ax = fig.add_subplot(111)
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()
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