FancyArrowPatch behaves quite differently from normal patches.
Most importantly, the path must be reevaluated during the drawing time, so
a normal PatchCollection, which evaluate the paths during the instance
creation, won't work. i.e., you need a new Collection class.
Below is a very incomplete implementation of FancyArrowPatchCollection,
just for a demonstration purpose. And I recommend you to open a wishlist
ticket at the issue tracker (https://github.com/matplotlib/matplotlib/issues
).
Regards,
-JJ
class FancyArrowPatchCollection(PatchCollection):
def set_paths(self, patches):
self._patches = patches
def get_paths(self):
paths = []
for p in self._patches:
p.set_transform(self.get_transform())
_path, fillable = p.get_path_in_displaycoord()
paths.extend(_path)
return paths
def _prepare_points(self):
import matplotlib.transforms as mtransforms
transform, transOffset, offsets, paths =
PatchCollection._prepare_points(self)
return mtransforms.IdentityTransform(), transOffset, offsets, paths
On Thu, Jan 31, 2013 at 6:33 AM, Skipper Seabold jsseab...@gmail.comwrote:
Hi,
Trying to figure out why these two do not create the same plot. Bug or
user error?
import matplotlib.pyplot as plt
from matplotlib.patches import FancyArrowPatch
from matplotlib.collections import PatchCollection
def correct_patch(pos):
fig, ax = plt.subplots()
for src, dst in pos:
arrow = FancyArrowPatch(posA=src, posB=dst,
color='k', arrowstyle='-|',
mutation_scale=30, connectionstyle=arc3)
ax.add_patch(arrow)
return fig
def patch_collection_problem(pos):
fig, ax = plt.subplots()
pos = [[(.5, .5), (.25, .25)],
[(.1, .5), (.2, .75)]]
arrows = []
for src, dst in pos:
arrows.append(FancyArrowPatch(posA=src, posB=dst,
color='k', arrowstyle='-|',
mutation_scale=30, connectionstyle=arc3))
collection = PatchCollection(arrows, match_original=True)
ax.add_collection(collection, autolim=False)
return fig
pos = [[(.5, .5), (.25, .25)],
[(.1, .5), (.2, .75)]]
correct_patch(pos)
patch_collection_problem(pos)
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