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Unfortunately, this is something that I haven't considered when
implementing the FancyArrowPatch.
As you may know, FancyArrowPatch is a single patch object (at least
viewed from outside), so you cannot have multiple linestyles that can
be set by users.

So, one option is to change the implementation to use a hard-coded
line style for arrow heads, but this is not straight forward in fact.

Another option is to use custom path effects. Attached is a modified
version of your script with this approach.
Although this makes your code more complicated, this could be the most
straight forward way.

Regards,

-JJ




On Fri, Apr 13, 2012 at 10:30 AM, Jason Grout
<jas...@cr...> wrote:
> When the -|> style was added to FancyArrowPatch, the purpose was to add
> an arrow style with a certain style shaft, but a solid head [1].
> However, since the given linestyle is used for the outline of the head,
> we can have arrowheads that look very odd.  Here is the example input
> and output:
>
> http://aleph.sagemath.org/?q=0b7e7b41-e6cc-4cfe-b176-e42ece3565c9
>
> from matplotlib.pyplot import figure, show
> from matplotlib.patches import FancyArrowPatch
>
> fig = figure()
> ax = fig.add_subplot(111,autoscale_on=False,)
> p = FancyArrowPatch((0,0), (1,1),
> arrowstyle='-|>,head_width=8,head_length=16',lw=3,fc='k',ec='k',linestyle='dashed')
> ax.add_patch(p)
> show()
>
> Is there an easy fix to make the arrowhead have a solid linestyle, even
> if the shaft is dashed?  Is this desirable to anyone else besides me?
>
> Thanks,
>
> Jason
>
> [1] http://sourceforge.net/mailarchive/message.php?msg_id=21133511
>
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Hi Michiel,

> OK, that is good to know.
> The Apple-supplied python is not installed as a framework; I don't know for the Enthought distribution.

Are you sure about this? The Python libraries reside in /System/Library/Frameworks/Python.framework (at least on Lion, but also on earlier versions IIRC) and the installed pyconfig.h contains the following lines:

/* Define if you want to produce an OpenStep/Rhapsody framework (shared
   library plus accessory files). */
#define WITH_NEXT_FRAMEWORK 1


I have been using the MacOSX and TkAgg backends for 4 years with Apple Python (since Leopard) and have never seen a non-framework warning.

For the record, using the MacOSX backend on the released matplotlib 1.1.0 and Apple Python 2.7.1 on 10.7.3 Lion, I don't see the three specific focus-related problems first mentioned by Chris.

Regards,
Ludwig