Re: [Matplotlib-users] ANN: matplotlib-0.65.1

[Perry G. <pe...@st...>]

On Jan 3, 2005, at 7:36 PM, Stephen Walton wrote:

> Stephen Walton wrote:
>
>> second would be a windowed, scrollable view into an image which is 
>> larger than the physical display.
>
> Actually, imshow seems almost to do this.  I did
>
> imshow(imdata,interpolation='nearest')
>
> where imdata was a 1024 square image.  Zooming and panning _seems_ to 
> show the full resolution image with individual pixels visible at high 
> zooms.  Is this right?
>
Since John is away, if I interpret your question correctly, yes. Both 
implot and figimage save a reference to the original image so that when 
redisplayed, it is possible to do things like that (like expanding the 
size of a figimage window will show all pixels previously falling 
outside the bounds).

Your previous request regarding adding scrollable plot regions raises 
an interesting issue. I think this is tricky (John may prove me wrong 
on this). It was this sort of functionality that made chaco 
comparatively complex so I'm hesitant about adding it. Effectively one 
now one would be wandering into the area of having the plotting package 
begin to emulate widgets within its canvas (e.g., the scroll bars).

This doesn't mean that one couldn't write a gui application that had 
scroll bars that responded to scroll events by redisplaying the image 
(and plot) according to their position. But then it becomes gui 
dependent. Paul Barrett's suggestion to do a DS9 clone would likely 
take this approach I think.

As you noticed, the general toolbar gives some of this functionality, 
but I don't know if will satisfy all such needs that something like DS9 
does.

Perry