[OpenLayers-Dev] refreshing an image with new parameters

[Marc Jansen]

Hi Art,

Maybe it would be best to create a new Layer-type for your problem. But 
using layerevents may help for now, e.g.:

graphic-events.register('moveend', window, function() {
  // set the URL of your layer
});

Hope that helps, it is untested.

Regards,
Marc


Art Lembo wrote:
> I'm using Manifold GIS as a back-end GIS server.  It works really 
> great, except the WMS capabilities are horribly slow.  One thing that 
> is fast is the ability to generate an image of the GIS output by 
> passing a url to a Manifold IMS site: 
>
>   
> var graphic = new OpenLayers.Layer.Image (
>    'My Map',
>    
> 'http://blah,blah,blah/map.asp?[layers],[centerX],[centerY],[ScaleX],[ScaleY],[spatialSQL 
> process],etc...
>
> so, this works really fast (instantaneous), and gets me a layer inside 
> my OpenLayers site.  And, I can even pass it an analysis function and 
> it does that too.
>
> Now, when I zoom in or pan, obviously it just works with that initial 
> image (i.e. var graphic) that was grabbed from the init function.  So, 
> of course zoom-ins begin to pixelate rather quickly.
>
> I would like the ability to refresh the initial image every time I 
> zoom in or pan, using new centerX,centerY, and scales.  That is, some 
> function that gets thrown before the the image is redrawn.  
>
> I guess it is an image Refresh, but that doesn't quite do it.  My hope 
> is to:
>
> 1.  When the user zooms in I grab the new centerX, centerY, and scales 
> from the browser, and reconstruct the url to hit the server again and 
> show me an updated version, which will now be the zoomed in version of 
> the layers.
>
> Any advice?
>
> thanks!
>
>
>
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>
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>   


-- 


  Dipl.-Geogr. Marc Jansen
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