Flex加載 ArcGIS Server發佈的切片地圖（不直接使用ArcGISTiledMapServiceLayer）

1、類

package lyrs 
{ 
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.LOD; 
import com.esri.ags.layers.supportClasses.TileInfo; 

import flash.net.URLRequest; 

import flashx.textLayout.formats.Float; 

import mx.controls.Alert; 

public class Server extends TiledMapServiceLayer 
{ 
//成員變量 
private var _tileInfo:TileInfo = new TileInfo(); 
private var _wkid:int = 2384; 
private var _baseURL:String = "http://10.19.1.50/mapcache"; 
// private var cornerCoordinate:Number = 20037508.3427892; 
public var _mapStyle:String = "Vector"; 
private var _initialExtent:Extent; 

public function Server() 
{ 
super(); 
buildTileInfo(); // to create our hardcoded tileInfo 
setLoaded(true); // Map will only use loaded layers 
} 

// 全屏範圍 
override public function get fullExtent():Extent 
{ 
return new Extent(483777.982548502,296808.286300247,510241.397182649,315029.660346049, new SpatialReference(_wkid)); 
} 

// 初始化範圍 (左下角座標，右上角座標) 
override public function get initialExtent():Extent 
{ 
return new Extent(483777.982548502,296808.286300247,510241.397182649,315029.660346049, new SpatialReference(_wkid)); 
} 

// 空間參考系 
override public function get spatialReference():SpatialReference 
{ 
return new SpatialReference(_wkid); 
} 

override public function get tileInfo():TileInfo 
{ 
return _tileInfo; 
} 

override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest 
{ 
var url:String = _baseURL 
+ "/L" + padString(String(level), 2, "0") 
+ "/R" + padString(row.toString(16), 8, "0") 
+ "/C" + padString(col.toString(16), 8, "0") + ".png"; 
return new URLRequest(url); 
} 

// 自定義方法，定義地圖縮放等級 
private function buildTileInfo():void 
{ 
_tileInfo.height=512; 
_tileInfo.width=512; 
_tileInfo.origin=new MapPoint(-5123200,10002100); 
_tileInfo.spatialReference=new SpatialReference(_wkid); 
_tileInfo.lods = [ 
new LOD(0, 33.0729828126323, 125000), 
new LOD(1, 16.9333672000677, 64000), 
new LOD(2, 8.46668360003387, 32000), 
new LOD(3, 4.23334180001693, 16000), 
new LOD(4, 2.11667090000847, 8000), 
new LOD(5, 1.05833545000423, 4000), 
new LOD(6, 0.529167725002117, 2000), 
new LOD(7, 0.264583862501058, 1000), 
new LOD(8, 0.132291931250529, 500) 
]; 
} 

private function padString(text:String, size:int, ch:String):String 
{ 
while (text.length < size) 
{ 
text = ch + text; 
} 
return text; 
} 
} 
}

2、引用1

（baseMap可爲esri:map組件）

    var baseLayer:Server = new Server();

    baseMap.addLayer(baseLayer); 

2、引用2

 <esri:Map id="mymap" width="100%" height="100%">

  <lyrs:Server id="virtualTiles" fadeInFrameCount="12"/>

 </esri:Map>