display image with maximum width keeping an equal ratio

Question

How to display an image with imshow on all the width of an axe (viewport) but keeping the ratio 'equal' ?

import matplotlib.pyplot as plt
import numpy as np

fig, ax = plt.subplots(nrows=2, figsize=(8,8))
img = ax[0].imshow(np.random.random((10,10)), aspect='equal')
line = ax[1].plot([12,34],[45,78])

I would like that the image width be aligned on the line plot keeping an equal ratio even if that implies having blank around. My application has a zooming feature coded on the image in fact so I would to offer all the width possible for its display.

So in few words, I would like the same width as with aspect='auto' but with square pixels. Is it possible ? Thanks.

I think this is what you're looking for https://stackoverflow.com/a/13390798/18624880 — Pedro Barreto, Mar 31 '22 at 13:47
No, the aspect="auto" expand the horizontal axis. I would like to keep aspect equal with a larger axe width. — PBrockmann, Mar 31 '22 at 14:22

score 1 · Accepted Answer · answered Mar 31 '22 at 14:55

Found with a reading of Axes class - set explicitly size (width/height) of axes in given units and the use of

set_adjustable('datalim')

import matplotlib.pyplot as plt
import numpy as np

fig, ax = plt.subplots(nrows=2, figsize=(8,8))
img = ax[0].imshow(np.random.random((10,10)), aspect='equal')
ax[0].set_adjustable('datalim')
line = ax[1].plot([12,34],[45,78])

display image with maximum width keeping an equal ratio

1 Answers1