ArcGIS Flex API 調用天地圖和Google地圖服務

Esri爲我們提供了TiledMapServiceLayer類，這個類正是所有瓦片地圖服務都必須繼承的類，像ArcGISTiledMapServiceLayer, OpenStreetMapLayer, VETiledLayer等esri提供的瓦片類都是繼承了該類的，所以我們要擴展該TiledMapServiceLayer類

一.調用天地圖服務（SXGeoTileLayer類）

 import com.esri.ags.SpatialReference;
 import com.esri.ags.geometry.Extent;
 import com.esri.ags.geometry.MapPoint;
 import com.esri.ags.layers.supportClasses.LOD;
 import com.esri.ags.layers.supportClasses.TileInfo;
 import com.esri.ags.layers.TiledMapServiceLayer;
 import com.esri.ags.layers.TiledMapServiceLayer;
 
 import flash.geom.Point;
 import flash.net.URLRequest;
 
 /**
  * SXGeoTileLayer 
  */
 public class SXGeoTileLayer extends TiledMapServiceLayer
 {
  //--------------------------------------------------------------------------
  //
  //  Constructor
  //
  //--------------------------------------------------------------------------
  
  /**
   * Creates a new PortlandTiledMapServiceLayer object.
   */
  public function SXGeoTileLayer()
  {
   super();
   
   buildTileInfo(); // to create our hardcoded tileInfo 
   
   setLoaded(true); // Map will only use loaded layers
  }
  
  //--------------------------------------------------------------------------
  //
  //  Variables
  //
  //--------------------------------------------------------------------------
  
  private var  wkid:int = 4326;
  private var _tileInfo:TileInfo = new TileInfo();  // see buildTileInfo() 
  private var _url:String = new String();
  //private var _wmsLayer:String = new String(); 
  
  //--------------------------------------------------------------------------
  //
  //  Overridden properties
  //      fullExtent()
  //      initialExtent()
  //      spatialReference()
  //      tileInfo()
  //      units()
  //
  //--------------------------------------------------------------------------
  
  
  //----------------------------------
  //  fullExtent
  //  - required to calculate the tiles to use
  //----------------------------------
  
  override public function get fullExtent():Extent
  {
   return new Extent(-180, -90, 180, 90, new SpatialReference(4326));
   //return new Extent(65.94,18.84,137.74,62.85, new SpatialReference(4326));
  }
  
  //----------------------------------
  //  initialExtent
  //  - needed if Map doesn't have an extent
  //----------------------------------
  
  override public function get initialExtent():Extent
  {
   return new Extent(-124.731422,24.955967,-66.969849, 49.371735,new SpatialReference(4326));
   //return new Extent(112.48,47.77,112.60,47.97, new SpatialReference(4326));
  }
  
  //----------------------------------
  //  spatialReference
  //  - needed if Map doesn't have a spatialReference
  //----------------------------------
  
  override public function get spatialReference():SpatialReference
  {
   return new SpatialReference(4326);
  }
  
  //----------------------------------
  //  tileInfo
  //----------------------------------
  
  override public function get tileInfo():TileInfo
  {   
   return _tileInfo;
  }
  
  //----------------------------------
  //  units
  //  - needed if Map doesn't have it set
  //----------------------------------
  
  override public function get units():String
  {
   return "esriDecimalDegrees";
  }
  
  //--------------------------------------------------------------------------
  //
  //  Overridden methods
  //      getTileURL(level:Number, row:Number, col:Number):URLRequest
  //
  //--------------------------------------------------------------------------
  
  override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest
  {
   var url:String ;
   url = _url  + "&X=" + col.toString() + "&Y=" + row.toString()+ "&L="+ level.toString();
   return new URLRequest(url) ;
  }
  
  //--------------------------------------------------------------------------
  //
  //  Private Methods
  //
  //--------------------------------------------------------------------------
  
  private function buildTileInfo():void
  {
   _tileInfo.height = 256;
   _tileInfo.width = 256;
   _tileInfo.origin = new MapPoint(-180, 90);
   _tileInfo.spatialReference = new SpatialReference(4326);
   _tileInfo.lods = [    
    //new LOD(0, 1.40625, 590995197.1416691),
    new LOD(1, 0.703125, 295497598.5708346),
    new LOD(2, 0.3515625, 147748799.2854173),
    new LOD(3, 0.17578125, 73874399.64270864),
    new LOD(4, 0.087890625, 36937199.82135432),
    new LOD(5, 0.0439453125, 18468599.91067716),
    new LOD(6, 0.02197265625, 9234299.95533858),
    
    new LOD(7, 0.010986328125, 4617149.97766929),
    new LOD(8, 0.0054931640625, 2308574.98883465),
    new LOD(9, 0.00274658203124999, 1154287.49441732),
    new LOD(10, 0.001373291015625, 577143.747208662),
    new LOD(11, 0.0006866455078125, 288571.873604331),
    new LOD(12, 0.000343322753906249, 144285.936802165),
    new LOD(13, 0.000171661376953125, 72142.9684010827),
    new LOD(14, 0.0000858306884765626, 36071.4842005414),
    new LOD(15, 0.0000429153442382813, 18035.7421002707),
    new LOD(16, 0.0000214576721191406, 9017.87105013534),
   ];
  }
  
  private function padString(text:String, size:int, ch:String):String
  {
   while (text.length < size)
   {
    text = ch + text;
   }
   return text;
  }
  public function set url(val:String):void
  {
   this._url = val;
  }
 }

使用方法：

    var wmslayer:SXGeoTileLayer=new SXGeoTileLayer();
    wmslayer.url=" http://tile0.tianditu.com/DataServer?T=A0610_ImgAnno";
    map.addLayer(wmslayer);

二.調用Google地圖服務

    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;
     
    //擴展TiledMapServiceLayer圖層實現加載google地圖
    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;
        }
         
        //獲取矢量地圖
        override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest
        {
            var url:String=_baseURL&+
                "x=" + col + "&" +
                "y=" + row + "&" +
                "z=" + level+ "&s=";
             
            return new URLRequest(url);
        }
        public function set url(val:String):void
	{
		this._baseURL = val;
	}
        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)
            ];
        }
    }

使用方法：

    var wmslayer:GoogleMapLayer =new GoogleMapLayer();
    wmslayer.url="http://khm2.google.com/kh/v=38&hl=zh-CN";
    map.addLayer(wmslayer);