Re: [Matplotlib-users] URLs embedded in PNG or JPEG

[Julius L. <jul...@gm...>]

On 2/15/06, John Hunter <jdh...@ac...> wrote:
> >>>>> "Charlie" =3D=3D Charlie Moad <cw...@gm...> writes:
>
>     Charlie>      You could use html image maps to accomplish this.
>     Charlie> Obviously this would be in the context of a web page.  I
>     Charlie> think frontpage or dreamweaver has some nice tools for
>     Charlie> creating these.  Just google "html image maps" for more
>     Charlie> info.
>
> Andrew Dalke has a tutorial on creating html image maps with
> matplotlib
>
> http://www.dalkescientific.com/writings/diary/archive/2005/04/24/interact=
ive_html.html
>
> JDH
>

This tutorial was a start.  I want to do a similar thing, but use
rectangle objects for the image map, whose coordinates are derived
from matplotlib polygon objects.  I was wondering if anyone knew how
to do this, or could point me to some documentation.

Basically I have a simple figure:

>
from pylab import *

clf()
fig =3D figure(1,(4,4))
ax =3D axis()
pl =3D plot(range(0,10),range(0,10),'b-')
box =3D axvspan(3,5,fc=3D'm',alpha=3D0.5)

#get vertices [(ul.x,ul.y),(lr.x,lr.y)]
#ul =3D upper left
#lr =3D lower right
#have to multiply ul.y by the upper ylim since for axvspan, ul.y=3D1
spans the range
b_verts =3D box.get_verts()
verts =3D [(b_verts[1][0],b_verts[1][1]*ax.get_ylim()[1]),(b_verts[3][0],b_=
verts[3][1])]
>


my question is what transform do I use to convert verts to pixel coordinate=
s?
ax.get_transform() does not work.  Should I use pl.get_transform?

Thanks for your help!

Cheers,

Julius