[OpenLayers-Dev] final animated zooming and panning patches

[Emanuel Schütze]

Hi Paul,

I'm not exactly sure what do you mean.
If you start the demo; zoom f.e. to level 5 and you drag now the slider to 
level 0 you get a new zoomOut tile which show you new informations arround 
the last viewport of level 5. This zoomOut tile is 4 times greater than a 
standard tile and it contains the max extent. So it comes to some alleged 
strange situations if you zoom out from a high level. After mouseUp the  
zoomOut tile stay pixelated until the new tiles are loaded. This is a normal 
zoom out process. Sure, we could improve it but therefor you have to load 
more zoomOut tiles which scales in higher levels - and this could be evoke 
new performance problems. 

To improve your own performance try to make your map smaller. My demo has a 
map with 100% width; dependent on your screen resolution there are many tiles 
which have to scale. Perhaps there is the bad performance effect if the tile 
size over 32768px like in IE? Which browser and hardware do you use? I can't 
reproduce these effects on my machines. Try the controls example [1]. It 
should works faster.

Regards,
Emanuel

[1]http://dev.openlayers.org/sandbox/emanuel/animatedZooming/examples/controls.html

On Thursday 29 March 2007 15:10, Paul Spencer wrote:
> Hi Emanuel,
>
> I just tried this out for the first time and its quite good :)  I
> have one piece of feedback.  In all browsers (although perhaps Safari
> is the worst), there is a strange visual effect after it has scaled
> the tiles and before the new tiles arrive, some (or all perhaps) of
> the tiles change to a very blurry image ... its very pixelated, each
> pixel looks like it is about 50 square pixels on my screen.  This
> doesn't happen right away, only after I have zoomed in a few times.
>
> Also, after a few zooms, the whole thing slows down to the point of
> being not useful anymore and jacks my processor through the roof ...
> at this point, even resizing the window is horribly slow and consumes
> a lot of processing power.  I've attached a screen grab of the blurry
> stuff that happens on zoom out.
>
> It does work great when first opened, though, so hopefully its
> fixable :)
>
> Cheers
>
> Paul