Python: position text box fixed in corner and correctly aligned -

i'm trying mimic legend method in matplotlib.pyplot 1 can use loc='lower right' position legend box fixed , aligned no matter axis , content of box.

using text out since requires manual input of coordinates , i'm after automatic.

i've tried using annotate , gets me half way there, still won't work right.

this have far:

import matplotlib.pyplot plt  # define names , variables go in text box. xn, yn, cod = 'r', 'p', 'abc' prec = 2 ccl = [546.35642, 6785.35416] ect = [12.5235, 13.643241]  fig = plt.figure() ax = fig.add_subplot(111) plt.xlim(-1., 10.) plt.ylim(-1., 1.)  # generate text write. text1 = "${}_{{t}} = {:.{p}f} \pm {:.{p}f}\; {c}$".format(xn, ccl[0],     ect[0], c=cod, p=prec) text2 = "${}_{{t}} = {:.{p}f} \pm {:.{p}f}\; {c}$".format(yn, ccl[1],     ect[1], c=cod, p=prec) text = text1 + '\n' + text2  ax.annotate(text, xy=(0.75, 0.9), xycoords='axes fraction', fontsize=10,     bbox=dict(facecolor='white', alpha=0.8),     horizontalalignment='left', verticalalignment='bottom')  plt.savefig('annotate_test.png', dpi=150) 

which results in:

this correctly scale changing axis limits, problem that: 1- fail if axis set ax.set_aspect('equal'):

and 2- fail if text long (here set prec=5 in mwe above):

how can tell matplotlib position text box always in top right corner , align properly doesn't fall outside of image (ie: loc in legend)?

the quick-and-dirty way use right , top aligned text , place @ fixed offset in points axes corner:

import matplotlib.pyplot plt  # define names , variables go in text box. xn, yn, cod = 'r', 'p', 'abc' prec = 2 ccl = [546.35642, 6785.35416] ect = [12.5235, 13.643241]  fig = plt.figure() ax = fig.add_subplot(111) ax.axis([-1, 10, -1, 1])  # generate text write. text1 = "${}_{{t}} = {:.{p}f} \pm {:.{p}f}\; {c}$".format(xn, ccl[0],     ect[0], c=cod, p=prec) text2 = "${}_{{t}} = {:.{p}f} \pm {:.{p}f}\; {c}$".format(yn, ccl[1],     ect[1], c=cod, p=prec) text = text1 + '\n' + text2  ax.annotate(text, xy=(1, 1), xytext=(-15, -15), fontsize=10,     xycoords='axes fraction', textcoords='offset points',     bbox=dict(facecolor='white', alpha=0.8),     horizontalalignment='right', verticalalignment='top')  plt.show() 

because we've specified top , right alignment, works 2 edge cases:

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the downside of text right-aligned. ideally, you'd want text alignment separate box alignment. matplotlib.offsetbox module has number of methods handle things this.

if want mimic legend box (down location codes), have @ matplotlib.offsetbox.anchoredtext. (note can adjust padding, etc though pad , borderpad kwargs: http://matplotlib.org/api/offsetbox_api.html#matplotlib.offsetbox.anchoredoffsetbox )

import matplotlib.pyplot plt import matplotlib.offsetbox offsetbox  # define names , variables go in text box. xn, yn, cod = 'r', 'p', 'abc' prec = 5 ccl = [546.35642, 6785.35416] ect = [12.5235, 13.643241]  fig = plt.figure() ax = fig.add_subplot(111) ax.axis([-1, 10, -1, 1])  # generate text write. text1 = "${}_{{t}} = {:.{p}f} \pm {:.{p}f}\; {c}$".format(xn, ccl[0],     ect[0], c=cod, p=prec) text2 = "${}_{{t}} = {:.{p}f} \pm {:.{p}f}\; {c}$".format(yn, ccl[1],     ect[1], c=cod, p=prec) text = text1 + '\n' + text2  ob = offsetbox.anchoredtext(text, loc=1) ax.add_artist(ob)  plt.show() 

one downside adjusting font , box parameters result bit counter-intuitive. anchoredtext accepts dictionary of font parameters prop kwarg. box can adjusted after initialization through patch attribute. quick example:

ob = offsetbox.anchoredtext(text, loc=1,                     prop=dict(color='white', size=20)) ob.patch.set(boxstyle='round', color='blue', alpha=0.5) ax.add_artist(ob)