[Matplotlib-users] annotation arrow shrink

[vincent.adrien at gmail.com]

Hi Ilya,

Using a null-value for `shrinkA` or `shrinkB` does not achieve what you 
want?

FWIW, I think that the method used under the hood by `FancyArrowPatch` 
is located 
[here](https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/patches.py#L2706), 
while the percentage-to-points machinery in `Axes.annotate` (when 
*arrowstyle* is `None` and using the *shrink* parameter) seems to start 
[there](https://github.com/matplotlib/matplotlib/blob/master/lib/matplotlib/text.py#L2128).

Attached is a small snippet demonstrating both the percentage-based and 
the point-based shrinking possibilities, in case this might help.

Best,
Adrien

On 05/29/2018 11:20 AM, Ilya Flyamer wrote:
> Hi all,
> 
> I am trying to figure out how shrinkA works for arrows in annotations, 
> and it seems very confusing from experimenting with it - is there an 
> explanation somewhere online?
> I simply wanted to ensure that the arrow starts at the edge of the 
> bounding box, but it's not so easy, it seems... Is this not the right 
> way to do this, maybe?
> 
> Thanks!
> 
> Cheers,
> Ilya
> 
> 
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