"imshow" sets aspect=1 unless you changed your rcparams.
Unless aspect="auto", the axes position changes during the drawing time.

call imshow with aspect="auto"

or use set_aspect method.

http://matplotlib.sourceforge.net/api/axes_api.html?highlight=aspect#matplotlib.axes.Axes.set_aspect

Regards,

-JJ


On Thu, Jul 16, 2009 at 10:20 AM, Andrei Kopats<andrei.kop...@gmail.com> wrote:
> Hello
>
> I have a little problem.
>
> On figure I have 2 Axes created by
>        fig = plt.figure(figsize = (16, 10), facecolor='w')
>       ax1 = fig.add_axes([0, 0, 1, 0.1])
>       ax2 = fig.add_axes([0.1, 0.19, 0.8, 0.72], autoscale_on=True)
> There are some text and images on it:
>       ...
>       drawing  on ax1 and ax2
>       ...
>       ax1.imshow(arr, extent=[0.01, 0.29, 0.1, 0.95])
>       ax1.imshow(arr, extent=[0.75, 0.96, 0.5, 0.8])
>       ...
>
> My problem - when I plot the figure - ax1 changes it's geometry.
> Code:
>        print 'ax1:', ax1
>        print 'ax2:', ax2
>
>        plt.show()
>
>
>        print 'ax1:', ax1
>        print 'ax2:', ax2
>        print 'ax1 position changed during plt.show(). Why???'
>
> Output:
>
>        ax1: Axes(0,0;1x0.1)
>        ax2: Axes(0.1,0.19;0.8x0.72)
>        ax1: Axes(0.470649,0;0.0587025x0.1)
>        ax2: Axes(0.1,0.19;0.8x0.72)
>        ax1 position changed during plt.show(). Why???
>
> On resulting plot ax1 has position (0.470649,0;0.0587025x0.1), but
> desired are (0,0;1x0.1).
>
> Could anyone help me, or give an idea, why axes is moved, or give an
> advice, how to resolve this situation.
>
> Thank you
>
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