I don't have an answer to your question exactly. But I'll just say that
this does make sense. The aspect-corrected axes (after show) is a subset of
what you originally asked for, i.e. the bottom is higher, and the height is
smaller. My guess is that this is not calculated until the final rendering
on save on some computational effort. Otherwise, these values might need to
be recalculated every time you add e.g. a colorbar. There is certainly a
way to "trick" the plot into rendering, but I wonder if you could post a
small (maybe two axes) version that demonstrates the effect your trying to
accomplish. Perhaps someone might have a simpler/more robust solution.
Ryan
On Wed, Feb 18, 2015 at 4:27 AM, gdm <jgabor.as...@gmail.com> wrote:
> New matplotlib user here. Sometimes I like to make figures with multiple
> axes, and have lines that cross multiple axes. I've run in to problems
> with
> coordinates when doing this. One such problem is that axes.get_position()
> seems to return incorrect coordinates for an axes with a fixed aspect
> ratio.
> However, after calling pyplot.show() (or fig.savefig()), it returns the
> correct coordinates.
>
> Here is some example code:
> #########################
> import numpy
> import matplotlib.pyplot as plt
>
> # make up some data
> x = numpy.arange(10)
> y = numpy.sin(x)
> y2 = numpy.cos(x)
>
> # generate the figure
> fig = plt.figure()
>
> # setup the first axes
> ax1 = fig.add_subplot(121)
> plt.plot(x,y)
>
> # setup the second axes with axis ratio
> ax2 = fig.add_subplot(122, aspect=6)
> plt.plot(x, y2)
>
> # Print out the axes position after various operations
> print "aaa", ax2.get_position()
>
> plt.draw()
> print "bbb", ax2.get_position()
>
> fig.canvas.draw()
> print "ccc", ax2.get_position()
>
> plt.show(block=False)
> print "yyy", ax2.get_position()
> ##########################
>
> Running this code produces the following output:
> aaa Bbox('array([[ 0.54772727, 0.1 ],\n [ 0.9 , 0.9
> ]])')
> bbb Bbox('array([[ 0.54772727, 0.1 ],\n [ 0.9 , 0.9
> ]])')
> ccc Bbox('array([[ 0.54772727, 0.1 ],\n [ 0.9 , 0.9
> ]])')
> yyy Bbox('array([[ 0.54772727, 0.18686869],\n [ 0.9 ,
> 0.81313131]])')
>
> P.S.: I think this might be related to an issue noted here:
>
> http://stackoverflow.com/questions/11900654/get-position-does-strange-things-when-using-a-colorbar
>
>
>
>
>
> --
> View this message in context:
> http://matplotlib.1069221.n5.nabble.com/axes-get-position-inaccurate-until-after-savefig-tp44954.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
>
>
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