Re: [Matplotlib-users] embedding figures inside another (coordinates)

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

This thread might be helpful.

http://thread.gmane.org/gmane.comp.python.matplotlib.general/16373

Take a look at the above thread and see if it fits your need.

However, it became tricky if your axes adjust its position (e.g.,
aspect=1) during the drawing time.
The example below will be helpful in those case (you need recent
version of matplotlib for this, see if your axes has
"set_axes_locator" method), but this requires some knowledge on how
mpl works.


import matplotlib.transforms

class InsetPosition(object):
    def __init__(self, parent, lbwh):
        self.parent = parent
        self.lbwh = lbwh # position of the inset axes in the
normalized coordinate of the parent axes

    def __call__(self, ax, renderer):
        bbox_parent = self.parent.get_position(original=False)
        trans = matplotlib.transforms.BboxTransformTo(bbox_parent)
        bbox_inset = matplotlib.transforms.Bbox.from_bounds(*self.lbwh)
        bb = matplotlib.transforms.TransformedBbox(bbox_inset, trans)
        return bb

ax = gca()
ax.set_aspect(1.)
axins = axes([0, 0, 1, 1])
ip = InsetPosition(ax, [0.5, 0.1, 0.4, 0.2])
axins.set_axes_locator(ip)


IHTH,

-JJ




On Wed, Apr 1, 2009 at 8:22 AM, oyarsa the old <oya...@gm...> wrote:
> Hello,
>
> I am new to matplotlib and pylab.
> I have an image plotted with imshow/contour, or even just a coordinate
> system plotted with axis.
>
> I need to plot smaller contours/images on them at selected pixels. The only
> way I can figure how to do that is using axes. However, axes is defined on
> normalised coordinates which cover the entire window, whereas the axis of
> the main figure is drawn within it, with some margin.
>
> My problem is how to get the correct coordinates for plotting each of the
> smaller figures ? The easiest way to do so would be to get the normalised
> coordinates of the rectangle which is drawn by axis. Is there a way to get
> that?
>
> Thanks
> Mohan.
>
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