Eric Firing wrote:
> Maybe I am misunderstanding, but the EllipseCollection in the example is 
> panning and zooming as I expect.  The shapes and orientations are 
> staying the same while the scale expands and contracts with the x-axis.
> 
> The problem is that the option you are looking for does not exist yet.   
> I am not sure yet whether what you need is identical to an option I 
> added to quiver (from which I partially derived EllipseCollection).  I 
> suspect it is.

Thanks, I now understand better what is the main goal of EllipseCollection: in 
a quiver-like use, you don't want indeed the plotted ellipses to change size 
and/or orientation with scaling and zooming.

> Do you want width to scale with x and height to scale with y?  And the 
> angle to scale such that a 45-degree angle always corresponds to equal 
> increments in x and in y, all in data units?

Yes, in the context of error-ellipses, I would like to see my ellipses scale 
with x and y, as they do when I plot them individually as Ellipse patches (see 
example scripts, the blue ellipses are what I would like to obtain using an 
EllipseCollection), something like "units='data'" in EllipseCollection...

Cheers,
-- 
    .~.   Yannick COPIN  (o:>*  Doctus cum libro
    /V\   Institut de physique nucleaire de Lyon (IN2P3 - France)
   // \\  Tel: (33/0) 472 431 968     AIM: YnCopin ICQ: 236931013
  /(   )\ http://snovae.in2p3.fr/ycopin/
   ^`~'^

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