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.com>wrote:
> 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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