[OpenLayers-Users] asking the same layer to mapserver and tilecache depending on resolution

[Alessio Di Lorenzo]

Hi guys,

I'm developing a little webgis and I need to use some wms layer that are
requested in two different ways: 

- when the map resolution is <= 305.7481130859375 I want to request the
cached layer (with TileCache)

- when the resolutione is > 305.7481130859375 I want to send directly the
wms request to mapserver

I did something like the following 

var res = map.getResolution();
    	
if (res <= 305.7481130859375) {

//use wms request on mapserver
	bovini = new OpenLayers.Layer.WMS( "Bovini", 
		        "http://brucellosi.izs.it/cgi-bin/mapserv?",
		        {map: '/usr/local/apache2/htdocs/mapfiles/brucellosi_alessio.map', 
		        transparent:'true', layers: 'a_bovini', 'format':'png'}, 
		        {'reproject': false, singleTile:true, isBaseLayer: false} );
		bovini.setVisibility(false);
		map.addLayer(bovini);
			
			
	bovini_q = new OpenLayers.Layer.WMS( "Bovini_q", 
		        "http://brucellosi.izs.it/cgi-bin/mapserv?",
		        {map: '/usr/local/apache2/htdocs/mapfiles/brucellosi_alessio.map', 
		        transparent:'true', layers: 'a_bovini_q', 'format':'png'}, 
		        {'reproject': false, singleTile:true, isBaseLayer: false} );
		bovini_q.setVisibility(false);
		map.addLayer(bovini_q);
			
			
	bovini_p = new OpenLayers.Layer.WMS( "Bovini_p", 
	       		"http://brucellosi.izs.it/cgi-bin/mapserv?",
	        	{map: '/usr/local/apache2/htdocs/mapfiles/brucellosi_alessio.map', 
	        	transparent:'true', layers: 'a_bovini_p', 'format':'png'}, 
	        	{'reproject': false, singleTile:true, isBaseLayer: false} );
		bovini_p.setVisibility(false);
		map.addLayer(bovini_p);
    	
} else if (res > 305.7481130859375) {

  	//ask for tilecache tiles on the disk
	    bovini   = new OpenLayers.Layer.WMS( "Bovini", tilecache,{layers:
'a_bovini'},{isBaseLayer: false} );
	    map.addLayer(bovini);
	   
	    bovini_q = new OpenLayers.Layer.WMS( "Bovini_q", tilecache,{layers:
'a_bovini_q'},{isBaseLayer: false} );
	    map.addLayer(bovini_q);
		    
	    bovini_p = new OpenLayers.Layer.WMS( "Bovini_p", tilecache, {layers:
'a_bovini_p'},	{isBaseLayer: false} );
	    map.addLayer(bovini_p);
	    
}


The problem is that this solution works only in selecting the "starting
source"... 
In this case, at the beginning, tilecache is correctly selected as layer
source, but if I zoomIn (and my resolution becames > 305.748...) the layer
is not
requested to mapserver wms but still to tilecache...
-- 
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