Annotation text bbox calculated incorrectly in matplotlib>=1.4.3?

[joferkington]

Prior to matplotlib 1.4.3, text bounding boxes created with annotate did not include the connection arrow. Starting with 1.4.3 and continuing up to the current HEAD, the bbox includes the connection arrow.

As an example:

import matplotlib.pyplot as plt
import matplotlib

fig, ax = plt.subplots()

ax.annotate('Matplotlib {}'.format(matplotlib.__version__),
            xy=(0.1, 0.1), xytext=(50, 50), size=20,
            xycoords='data', textcoords='offset points',
            bbox=dict(alpha=0.5, fc='yellow'),
            arrowprops=dict(arrowstyle='->'))

plt.show()

This may be related to #4012?

[jenshnielsen]

I think this is likely due to #4023 which was merged as 26c7d65

[tacaswell]

I agree with @jenshnielsen's diagnosis. Someplace a call to self.get_window_extent()needs to be changed toText.get_window_extent(self)`.

[cimarronm]

It is related to #4023. The issue is that the Annotation draw method calls the Text draw method to draw the text box portion. Inside that, it calls bbox_artist from the patches modules which then calls get_window_extent of the instance.

[efiring]

There's even more: if boxstyle='square' is added to the bbox dictionary kwarg in the example, so that a FancyBboxPatch is drawn, then the filled region is correct, but the arrow is not clipped correctly.

[tacaswell]

The clipping is related to #4012 I think.