[udig-devel] repaint of the map

[Gabriel Roldán]

On Thursday 20 July 2006 10:04, lscirank at email.cz wrote:
> Hi,
> I tried Udig. It is good, but the repaint of the map is very slow.
> I would like to know, if this problem is caused that Java is used, or bad
> algorithm and if this problem will be solved. I noticed that all map is
> repainted.
> But I tried for example software Map Window GIS (http://www.mapwindow.org)
> and this software paints only a missing part of map, when  I use function
> pan for moving map.(This software is not written in Java.)

I don't know MapWindow, so if you perceive a tiled rendering on it I might be 
just wrong, but this sounds to me like just a matter of "preceived 
performance" rather than effective performance, and its certainly something 
we could improve in uDig. 
what I mean is that, from my experience, a panning interaction benefits from 
not presenting any flickering on the image drawn while rebuilding the whole 
map image in the background. Instead, uDig displays a blank image when you 
release the moue on a panning action, and this leads to a "feeling" of 
slowness, while when this doesn't happens, the user gets the "feeling" of 
greater responsivenes.

But as said, I could just be wrong.

2c.

Gabriel

>
> Thank you for your answer.
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
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-- 
Gabriel Roldán (groldan at axios.es)
Axios Engineering (http://www.axios.es)
Tel. +34 944 41 63 84
Fax. +34 944 41 64 90