Plotting Arrows

This turns out to be a bug.
And I think fixed it with r8720 and r8721.

Meanwhile, try to use other arrowstyles (e.g., "->") or other arrow commands.

Also, the recommend way is to use "annotate" command. For example,

ax.annotate("", (0, 0), (3,2), arrowprops=dict(arrowstyle="->"))

Regards,

-JJ

···

---------- Forwarded message ----------
From: Jae-Joon Lee <lee.j.joon@...287...>
Date: Mon, Sep 27, 2010 at 11:41 AM
Subject: Re: [Matplotlib-users] Plotting Arrows
To: Gus Ishere <gus.is.here@...287...>

On Sun, Sep 26, 2010 at 3:11 PM, Gus Ishere <gus.is.here@...287...> wrote:

I'd like to plot some arrows. I can use the pyplot.arrow function but it
does not give an arrow head. I am trying to use FancyArrow in the following
way:
import matplotlib as mpl
import matplotlib.pyplot as plt
plt.figure(None)
ax = plt.gca()
arr = mpl.patches.FancyArrowPatch((0,0),(3,2),arrowstyle='simple')
ax.add_patch(arr)
plt.show()
but I get "ValueError: Given lines do not intersect" in the bezier.py file.
(Full traceback below)
Thanks for any hints!
Gus

Traceback (most recent call last):
File "M:\mypy\minimum.py", line 8, in <module>
ax.add_patch(arr)
File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 1453, in
add_patch
self._update_patch_limits(p)
File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 1469, in
_update_patch_limits
vertices = patch.get_path().vertices
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line 3792, in
get_path
_path, fillable = self.get_path_in_displaycoord()
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line 3822, in
get_path_in_displaycoord
self.get_mutation_aspect()
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line 2845, in
__call__
return self.transmute(path, mutation_size, linewidth)
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line 3384, in
transmute
tail_left, tail_right = get_parallels(arrow_out, tail_width/2.)
File "C:\Python26\lib\site-packages\matplotlib\bezier.py", line 359, in
get_parallels
c2x_left, c2y_left, cos_t2, sin_t2)
File "C:\Python26\lib\site-packages\matplotlib\bezier.py", line 34, in
get_intersection
raise ValueError("Given lines do not intersect")
ValueError: Given lines do not intersect
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