[FIXED] Horizontal alignment of multi-line text in a matplotlib text box

Issue

I would like to have multi-line text left-aligned inside a box that is right-aligned, or rather whose position is defined in terms of its right edge.

That is, I'd like the text "the other." in the following to be left-aligned:

import matplotlib.pyplot as plt
def lowerrighttext(ax,text, size=12, alpha = 0.5, color='k', dx=1.0/20, dy=1.0/20):
    return  ax.annotate(text, xy=(1-dx, dy), xycoords = 'axes fraction', 
                        ha='right',va='bottom', color=color, 
                        size=size, bbox=dict(boxstyle="round", fc="w", 
                        ec="0.5", alpha=alpha) )

fig,ax=plt.subplots(1)
ax.plot([0,1],[0,1])
lowerrighttext(ax,'One line is longer than\nthe other.')
plt.show()

If I were to specify ha='left' it would apply to the text box, not just the text:

Solution

It looks like the trick is the multialignment or ma named argument:

import matplotlib.pyplot as plt

def lowerrighttext(ax,text, size=12, alpha = 0.5, color='k', dx=1.0/20, dy=1.0/20):
    return ax.annotate(text, xy=(1-dx, dy), xycoords = 'axes fraction',
                        ha='right',va='bottom',ma='left',color=color,           # Here
                        size=size, bbox=dict(boxstyle="round", fc="w",
                        ec="0.5", alpha=alpha))

fig,ax=plt.subplots(1)
ax.plot([0,1],[0,1])
lowerrighttext(ax,'One line is longer than\nthe other.')
plt.show()

Produces:

(Although it still seems a little off, not equidistant from the bottom and right sides, but maybe that's an effect of the figure being wider than it is tall.)

Answered By - jedwards