[Matplotlib-users] Fwd: Plotting Arrows

[Jae-Joon L. <lee...@gm...>]

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


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


On Sun, Sep 26, 2010 at 3:11 PM, Gus Ishere <gus...@gm...> 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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