[OpenLayers-Dev] refreshing an image with new parameters

[Marc Jansen]

sorry for the typo:

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

regards,
Marc

Marc Jansen wrote:
> 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!
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> Dev mailing list
>> Dev at openlayers.org
>> http://openlayers.org/mailman/listinfo/dev
>>   
>>     
>
>
>   


-- 


  Dipl.-Geogr. Marc Jansen
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