The only case I can think of now is that the two points are too close
(with in a few points). This could happen during the "shrink", or
during the "mutate"
(http://matplotlib.sourceforge.net/users/annotations_guide.html#annotating-with-arrow).
But it would be great if you can pinpoint this down and post a script
that reproduce the problem.
Regards,
-JJ
On Mon, Oct 26, 2009 at 1:57 PM, per freem <perfr...@gmail.com> wrote:
> hi all,
>
> i am trying to plot a series of arrows between points on a scatter
> plot, using the following code:
>
> import matplotlib.pyplot as plt
> from matplotlib.patches import FancyArrowPatch
> from numpy import *
> from scipy import *
>
> def plot_arrows(init_val, all_vals, c='k'):
> plt.figure()
> ax = plt.gca()
> prev_val = init_val
> for x, y in all_vals[1:]:
> ax = plt.gca()
> start_coord = prev_val
> plt.scatter(start_coord[0], start_coord[1], c=c)
> end_coord = (x, y)
> ax.add_patch(FancyArrowPatch(start_coord, end_coord,
> arrowstyle='->', edgecolor=c,
> facecolor=c, mutation_scale=10))
> prev_val = end_coord
> plt.scatter(all_vals[-1][0], all_vals[-1][1], c=c)
>
> points = rand(5,2)
> init = [0, 0]
> plot_arrows(init, points)
> plt.show()
>
> this usually works, but sometimes when i give it a set of points (not
> necessarily ones generated randomly), then it gives me the error:
>
> Library/Python/2.5/site-packages/matplotlib/bezier.pyc in
> split_path_inout(path, inside, tolerence, reorder_inout)
> 265
> 266 if bezier_path is None:
> --> 267 raise ValueError("The path does not seem to intersect
> with the patch")
> 268
> 269 bp = zip(bezier_path[::2], bezier_path[1::2])
>
> ValueError: The path does not seem to intersect with the patch
>
> any idea what could be causing this? it seems like any arbitrary set
> of points should work here, since you can always draw an arrow between
> any two points.... not sure what is the root of this error. any help
> would be really appreciated. thank you.
>
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