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

[Eric Lemoine]

Hi

Have you tried creating two layers, one with a maxResolution option
connected to TileCache, and the other with minResolution connected to
MapServer?

Cheers,

Eric

2009/2/13, Alessio Di Lorenzo <alessio.dilorenzo at gmail.com>:
>
> 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...
> --
> View this message in context:
> http://n2.nabble.com/asking-the-same-layer-to-mapserver-and-tilecache-depending-on-resolution-tp2321107p2321107.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>
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