matplotlib.pyplot, preserve aspect ratio of the plot
Does it help to use:
plt.axis('equal')
'scaled' using plt
The best thing is to use:
plt.axis('scaled')
As Saullo Castro said. Because with equal you can't change one axis limit without changing the other so if you want to fit all non-squared figures you will have a lot of white space.
Equal
Scaled
'equal' using ax
Alternatively, you can use the axes class.
fig = plt.figure()
ax = figure.add_subplot(111)
ax.imshow(image)
ax.axes.set_aspect('equal')
There is, I'm sure, a way to set this directly as part of your plot command, but I don't remember the trick. To do it after the fact you can use the current axis and set it's aspect ratio with "set_aspect('equal')". In your example:
import matplotlib.pyplot as plt
plt.fill(*zip(*polygon))
plt.axes().set_aspect('equal', 'datalim')
plt.show()
I use this all the time and it's from the examples on the matplotlib website.