flex load map

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ArcGIS Server flex加载google地图，早已不是什么技术问题。只不过今天结合着项目，底图和项目数据的坐标系统始终没有匹配。即使匹配了，也达不到精度问题。最后，且算是为客户多奉献了一些，将他们的数据重新转换为Web Mector系统，以和Google底图相匹配。囧~~他们的数据量不是有点大，那是相当的大~~

言归正传，ArcGIS Server加载google地图，只需要重写TiledMapServiceLayer类即可。关键代码如下：

package util
{
 import com.esri.ags.SpatialReference;
 import com.esri.ags.geometry.Extent;
 import com.esri.ags.geometry.MapPoint;
 import com.esri.ags.layers.TiledMapServiceLayer;
 import com.esri.ags.layers.supportClasses.*;
 import flash.net.URLRequest;

 //扩展TiledMapServiceLayer图层实现加载google地图
 public class GoogleMapLayer extends TiledMapServiceLayer
 {
 private var _tileInfo:TileInfo=new TileInfo();
 private var _baseURL:String="";
 public function GoogleMapLayer()
 {
 super();
 buildTileInfo();
 setLoaded(true);
 }
 override public function get fullExtent():Extent
 {
 return new Extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, new SpatialReference(102113));
 }
 override public function get initialExtent():Extent
 {
 return new Extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, new SpatialReference(102113));
 }
 override public function get spatialReference():SpatialReference
 {
 return new SpatialReference(102113);
 }
 override public function get tileInfo():com.esri.ags.layers.supportClasses.TileInfo
 {
 return _tileInfo;
 }
 //获取URL
 override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest
 {
 var url:String="http://mt0.google.cn/vt/v=w2.114&hl=zh-CN&gl=cn&" + "x=" + col + "&" +
 "y=" + row + "&" + "z=" + level+ "&s=";
 return new URLRequest(url);
 }
 private function buildTileInfo():void
 {
 _tileInfo.height=256;
 _tileInfo.width=256;
 _tileInfo.origin=new MapPoint(-20037508.342787, 20037508.342787);
 _tileInfo.spatialReference=new SpatialReference(102113);
 _tileInfo.lods = [new LOD(0, 156543.033928, 591657527.591555),
 new LOD(1,78271.5169639999, 295828763.795777), new LOD(2, 39135.7584820001, 147914381.897889),
 new LOD(3,19567.8792409999, 73957190.948944), new LOD(4, 9783.93962049996, 36978595.474472),
 new LOD(5,4891.96981024998, 18489297.737236), new LOD(6, 2445.98490512499, 9244648.868618),
 new LOD(7,1222.99245256249, 4622324.434309), new LOD(8, 611.49622628138, 2311162.217155),
 new LOD(9,305.748113140558, 1155581.108577), new LOD(10, 152.874056570411, 577790.554289),
 new LOD(11,76.4370282850732, 288895.277144), new LOD(12, 38.2185141425366, 144447.638572),
 new LOD(13,19.1092570712683, 72223.819286), new LOD(14, 9.55462853563415, 36111.909643),
 new LOD(15,4.77731426794937, 18055.954822), new LOD(16, 2.38865713397468, 9027.977411),
 new LOD(17, 1.19432856685505, 4513.988705), new LOD(18, 0.597164283559817, 2256.994353),
 new LOD(19, 0.298582141647617, 1128.497176)];

 }
 }
}

package util
{
	import com.esri.ags.SpatialReference;
	import com.esri.ags.geometry.Extent;
	import com.esri.ags.geometry.MapPoint;
	import com.esri.ags.layers.TiledMapServiceLayer;
	import com.esri.ags.layers.supportClasses.*;
	import flash.net.URLRequest;  
	
		//扩展TiledMapServiceLayer图层实现加载google地图  
	public class GoogleMapLayer extends TiledMapServiceLayer  
	{  
		private var _tileInfo:TileInfo=new TileInfo();  
		private var _baseURL:String="";  
		public function GoogleMapLayer()
		{ 
			super();
			buildTileInfo(); 
			setLoaded(true); 
		} 
		override public function get fullExtent():Extent
		{ 
       return new Extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, new SpatialReference(102113)); 
					} 
		override public function get initialExtent():Extent
		{ 
	return new Extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, new SpatialReference(102113));   
		}
		override public function get spatialReference():SpatialReference 
		{ 
			return new SpatialReference(102113); 
		} 
		override public function get tileInfo():com.esri.ags.layers.supportClasses.TileInfo 
		{ 
			return _tileInfo; 
		}  
		//获取URL  
		override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest  
		{ 
	var url:String="http://mt0.google.cn/vt/v=w2.114&hl=zh-CN&gl=cn&" + "x=" + col + "&" +  
				"y=" + row + "&" + "z=" + level+ "&s=";  
		return new URLRequest(url); 
		} 
		private function buildTileInfo():void 
		{ 
						_tileInfo.height=256; 
			_tileInfo.width=256; 
			_tileInfo.origin=new MapPoint(-20037508.342787, 20037508.342787);
			_tileInfo.spatialReference=new SpatialReference(102113);  
			_tileInfo.lods = [new LOD(0, 156543.033928, 591657527.591555),  
				new LOD(1,78271.5169639999, 295828763.795777), new LOD(2, 39135.7584820001, 147914381.897889),  
				new LOD(3,19567.8792409999, 73957190.948944),  new LOD(4, 9783.93962049996, 36978595.474472),  
				new LOD(5,4891.96981024998, 18489297.737236),  new LOD(6, 2445.98490512499, 9244648.868618),  
				new LOD(7,1222.99245256249, 4622324.434309),  new LOD(8, 611.49622628138, 2311162.217155),  
				new LOD(9,305.748113140558, 1155581.108577),  new LOD(10, 152.874056570411, 577790.554289),  
				new LOD(11,76.4370282850732, 288895.277144),  new LOD(12, 38.2185141425366, 144447.638572),  
				new LOD(13,19.1092570712683, 72223.819286),  new LOD(14, 9.55462853563415, 36111.909643),  
				new LOD(15,4.77731426794937, 18055.954822),  new LOD(16, 2.38865713397468, 9027.977411),  
				new LOD(17, 1.19432856685505, 4513.988705),  new LOD(18, 0.597164283559817, 2256.994353),  
				new LOD(19, 0.298582141647617, 1128.497176)]; 
				 
		}  
	}  
}

好了，就可以看到效果啦[img][/img]