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

[Alessio Di Lorenzo]

Hi Eric,

mmm... I don't understand exactly how to do it...
Can you give me an example?

Thank you a lot, alessio :)




Eric Lemoine wrote:
> 
> 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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