Re: [Matplotlib-users] plotting an arrow outside of the plot does not work any more

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

I just remembered that there has been a bug in old version of
matplotlib that annotation_clip parameter is not correctly set when
given as a keyword parameter of "annotate" function. The bug has been
fixed.

http://www.mail-archive.com/mat...@li.../msg15068.html

As a workaround, use

ann = pylab.annotate('',(-1,3.1),(0,3.1),va='center',ha='center',
              arrowprops=dict(arrowstyle='<->'))
ann.set_annotation_clip(False)

Regards,

-JJ



On Sun, Aug 29, 2010 at 5:59 AM, Stan Schymanski <ss...@bg...> wrote:
> Hi JJ,
>
> Thanks for the advice. However, the annotation_clip=False addition does not
> make a difference to me. I am using Matplotlib from within Sage, though; not
> sure if this makes it behave differently.
>
> Cheers
> Stan
>
> On 8/28/10 5:09 PM, Jae-Joon Lee wrote:
>>
>> I think this change has been there for a while.
>> For recent versions of matplotlib, the default behavior of annotate is
>> that, when xycoords=="data", the arrow is drawn only when the
>> annotated point is inside the axes.
>> To override this behavior, use annotation_clip keyword parameter.
>>
>>
>> pylab.annotate('',(-1,3.1),(0,3.1),va='center',ha='center',
>>                arrowprops=dict(arrowstyle='<->'), annotation_clip=False)
>>
>> Regards,
>>
>> -JJ
>>
>>
>> On Fri, Aug 27, 2010 at 9:21 PM, Stan Schymanski<ss...@bg...>
>>  wrote:
>>
>>>
>>> Dear all,
>>>
>>> I don't know which update it was that broke it, but this used to work:
>>>
>>> import numpy
>>> import pylab
>>> pylab.clf()
>>> fig = pylab.figure(1,figsize=(8,5))
>>> ax = fig.add_subplot(111, autoscale_on=False, xlim=(-1,5),
>>> ylim=(-4,3))
>>>
>>> t = numpy.arange(0.0, 5.0, 0.01)
>>> s = numpy.cos(2*numpy.pi*t)
>>> line, = ax.plot(t, s, lw=3, color='purple')
>>> pylab.text(-0.5,3.2,'no data',ha='center')
>>>
>>> pylab.annotate('',(-1,3.1),(0,3.1),va='center',ha='center',arrowprops=dict(arrowstyle='<->'))
>>> pylab.savefig('blah.png')
>>>
>>> This used to plot an arrow under the text 'no data' but above the main
>>> plot. Now this arrow does not appear unless at least part of it is within
>>> the plotting area. Change one of the '3.1' in the code above to, say, 3.0
>>> and the whole arrow is displayed. Is this a bug or is there a new way of
>>> achieving what I want?
>>>
>>> Thanks for your help already!
>>>
>>> Cheers
>>> Stan
>>>
>>>
>>>
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>
> --
> ________________________________________
>
> Stan Schymanski
> Scientist
> Max Planck Institute for Biogeochemistry
> PO Box 10 01 64
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>
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