Re: [Matplotlib-users] saving an axes to draw in a different figure

[Jae-Joon L. <lee...@gm...>]

I don't think your approach will work in general.
When you move an axes from one figure to the other, you have to update
the transform attributes of all the artists, which, I think, could be
tricky to do for general cases.



On Thu, Sep 17, 2009 at 1:59 PM,  <jas...@cr...> wrote:
> I'm trying to draw the axes from one figure directly over the axes for
> another figure, in a sense, combining the two axes as two layers on one
> figure.
>
> So, first I get an axes instance, "ax".
>
> import matplotlib.pyplot as plt
> fig=plt.figure()
> fig.add_subplot(111)
> plt.plot(range(10), [i^2 for i in range(10)])
> ax=fig.axes[0]
> plt.savefig('test.png')
>
>
> Okay, now I have the axes "ax".  I want to draw ax directly on top of
> the following figure, and get a result that would be the same as if I
> had called the plot command above directly in the following code.  All
> I'm passed in my real code is the newax variable below, which is why I
> use newax.get_figure()).
>
> fig=plt.figure()
> newax=fig.add_subplot(111)
> ax.set_figure(newax.get_figure())
> newax.get_figure().add_axes(ax,label="newax")
> plt.savefig('test2.png')

For this particular case, set the figure attribute directly instead of
calling the set_figure methods, which does more extra stuff. For
example,


fig=plt.figure()
ax.figure = fig
fig.add_axes(ax,label="newax")
plt.savefig('test2.png')

At least you will have your ticks right.

Again, this approach won't work well unless you update the transform
of all the artists as well.

>
> However, the result of test2.png is not very pretty and definitely not
> what I want.  The tick labels for the y-axis are all scrunched up, for
> example.
>
> Can anyone help?
>
> For those curious, what I'm doing is working on getting the Sage
> graphics code to be able to wrap and intelligently display matplotlib
> axes objects, so that a person could easily create a matplotlib axes,
> wrap it in the Sage graphics class, and then be able to manipulate it in
> Sage.  In order for this to work, it seems like I need to save the axes
> object I care about, and then when Sage composes it's final figure
> (using matplotlib), it passes me an AxesSubplot object.  I need to
> somehow take that subplot object and draw my saved axes on it in the
> most intelligent way possible.  In the code above, I try taking the
> given AxesSubplot object, getting the figure from that, and then just
> adding my saved axes to that figure.  Is there a better way to do this?
>

Having never used Sage before, I have little idea what you want to do
here (for example, what do you mean by "Sage composes it's final
figure"?). Anyhow, I think it would be best if you can figure out some
way that does not involves axes moving around.

Regards,

-JJ


> Thanks,
>
> Jason
>
> --
> Jason Grout
>
>
>
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