Flex 下兼容谷歌，百度地图服务
来源：互联网 发布：人物设定本子淘宝 编辑：程序博客网 时间：2024/04/29 21:36
最近一段时间一直在研究FlexViewer框架，使用各种地图服务作为地图显示上边叠加自己的一些要素，网上找了N久终于完成了底图的叠加,主要就是重写TiledMapServiceLayer的getTileURL，buildTileInfo方法.不多说直接贴代码！
百度跟谷歌的wkid不一致，这一点很悲剧。
谷歌：
package
{
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;
//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="";
private var _initialExtent:Extent;
private var _wkid:int = 102113;
public var mapType:String="map";
public function GoogleMapLayer(initialExtent:Extent=null)
{
super();
_initialExtent = initialExtent;
buildTileInfo();
setLoaded(true);
}
override public function get fullExtent():Extent
{
return new Extent(-20037508.342787, -20037508.342787, 20037508.342787, 20037508.342787, new SpatialReference(_wkid));
}
override public function get initialExtent():Extent
{
if(_initialExtent)
return _initialExtent;
return fullExtent;
}
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 s:String = "Galileo".substring(0, ((3 * x + y) % 8));
var url:String;
//获取矢量地图
if(mapType == "map")
{
url = "http://mt"+(col%4)+".google.cn/vt/lyrs=m@158000000&hl=zh-CN&gl=cn&" +
"x=" + col + "&" +
"y=" + row + "&" +
"z=" + level+ "&" +
"s=" + s;
}
else if(mapType == "image")//获取影像地图
{
url = "http://mt"+(col%4)+".google.cn/vt/lyrs=s@121&hl=zh-CN&gl=CN&src=api&" +
"x=" + col + "&" +
"y=" + row + "&" +
"z=" + level+ "&" +
"s=" + s;
}
else if(mapType == "poi")//获取道路POI
{
url = "http://mt"+(col%4)+".google.cn/vt/imgtp=png32&lyrs=h@169000000&hl=zh-CN&gl=cn&" +
"x=" + col + "&" +
"y=" + row + "&" +
"z=" + level+ "&" +
"s=" + s;
}
else if(mapType == "topography"){//地形
url = "http://mt"+(col%4)+".google.cn/vt/lyrs=t@129,r@183000000&hl=zh-CN&gl=cn&src=app&" +
"x=" + col + "&" +
"y=" + row + "&" +
"z=" + level+ "&" +
"s=" + s;
}else if(mapType == "real"){//植被map
url = "http://mt"+(col%4)+".googleapis.com/vt/lyrs=m@196000000&hl=zh-CN&src=api&" +
"x=" + col + "&" +
"y=" + row + "&" +
"z=" + level+ "&" +
"s=" + 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(_wkid);
_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)
];
}
}
}
百度：
package
{
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;
public class BaiduTiledMapServiceLayer extends TiledMapServiceLayer
{
private var _tileInfo:TileInfo = new TileInfo();
private var _wkid:int = 102100;//102100;
private var cornerCoordinate:Number = 20037508.3427892;
public var mapType:String = "map";
private var _initialExtent:Extent;
public function BaiduTiledMapServiceLayer()
{
super();
buildTileInfo(); // to create our hardcoded tileInfo
setLoaded(true); // Map will only use loaded layers
}
//----------------------------------
// 全屏范围
//----------------------------------
override public function get fullExtent():Extent
{
return new Extent(-cornerCoordinate, -cornerCoordinate, cornerCoordinate, cornerCoordinate, new SpatialReference(_wkid));
}
//----------------------------------
// 初始化范围
//----------------------------------
override public function get initialExtent():Extent
{
if (_initialExtent)
return _initialExtent;
return fullExtent;
}
//----------------------------------
// 空间参考系
//----------------------------------
override public function get spatialReference():SpatialReference
{
return new SpatialReference(_wkid);
}
//----------------------------------
// tileInfo
//----------------------------------
override public function get tileInfo():TileInfo
{
return _tileInfo;
}
//--------------------------------------------------------------------------
override protected function getTileURL(level:Number, row:Number, col:Number):URLRequest
{
var zoom:int = level - 1;
var offsetX:int = Math.pow(2, zoom) as int;
var offsetY:int = offsetX - 1;
var numX:int = col - offsetX;
var numY:int = (-row) + offsetY;
zoom = level + 1;
var num:int = (col + row) % 8 + 1;
var url:String = null;
if (mapType == "map")
{
url = "http://q"+num+".baidu.com/it/u=x="+numX+";y="+ numY + ";z=" + zoom + ";v=013;type=web&fm=44";
}
else if (mapType == "image")
{
url = "http://q"+num+".baidu.com/it/u=x="+numX+";y="+numY+";z="+zoom+";v=009;type=sate&fm=46";
}
else if (mapType == "poi")
{
url = "http://q"+num+".baidu.com/it/u=x="+numX+";y="+numY+";z="+zoom+";v=013;type=trans&fm=47";
}
return new URLRequest(url);
}
//--------------------------------------------------------------------------
//
// 自定义方法，定义地图缩放等级
//
//--------------------------------------------------------------------------
private function buildTileInfo():void
{
_tileInfo.height=256;
_tileInfo.width=256;
_tileInfo.origin=new MapPoint(-cornerCoordinate, cornerCoordinate);
_tileInfo.spatialReference=new SpatialReference(_wkid);
_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)
];
}
}
}
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