昨日改了一个buffer，buffer出来了但是跟随着一个问题，那就是identifytask出不来了。重新修改，发现一开始的问题就出来没有给地图指出extent，和wkid。这个必须制定，否则就会出现buffer做不出来的我难题。以下是buffer的正确代码
<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:esri="http://www.esri.com/2008/ags" layout="absolute" backgroundColor="#FFFFFF"><mx:Script> <![CDATA[ import com.esri.ags.events.DrawEvent; import com.esri.ags.events.*; import com.esri.ags.geometry.Geometry; import com.esri.ags.Graphic; import com.esri.ags.tasks.*; import com.esri.ags.SpatialReference; import com.esri.ags.toolbars.Navigation; import mx.events.ItemClickEvent; import mx.controls.Alert; [Bindable] [Embed(source="assets/measure-point.png")] public var point:Class;
[Bindable] [Embed(source="assets/measure-line.png")] public var polyline:Class; [Bindable] [Embed(source="assets/measure-line.png")] public var polygon:Class; [Bindable] [Embed(source="assets/measure-line.png")] public var ext:Class; private function itemClickHandler(event:ItemClickEvent):void { switch(event.index) { case 0: { drawToolbar.activate(Draw.MAPPOINT); break; } case 1: { drawToolbar.activate(Draw.POLYLINE); break; } case 2: { drawToolbar.activate(Draw.POLYGON); break; } case 3: { drawToolbar.activate(Draw.EXTENT); break; } } }
private function drawEndHandler(event:DrawEvent):void { var myGraphic:Graphic=event.graphic; //设置buffer参数 var bufferParameters : BufferParameters = new BufferParameters(); bufferParameters.features=[myGraphic]; //buffer距离半径 这里的具体单位由下面的单位设置决定 bufferParameters.distances = [1000]; //buffer单位 KILOMETER,METER bufferParameters.unit = BufferParameters.UNIT_METER; //buffer空间参照系,样例的空间参考系Id,WKID为102113的id,4326，对应于中国的wkid为102100， //只要使用了Geometry Service,则必须有与map控件中的wkid对应的wkid bufferParameters.bufferSpatialReference = new SpatialReference(102113); //添加BUFFER_COMPLETE监听 myGeometryService.addEventListener(GeometryServiceEvent.BUFFER_COMPLETE, bufferCompleteHandler); //进行buffer分析 myGeometryService.buffer( bufferParameters ); Alert.show(myGraphic.geometry.type.toString()); } //buffer完成后调用方法 private function bufferCompleteHandler( event : GeometryServiceEvent ) : void { myGraphicsLayer.clear(); //移除BUFFER_COMPLETE监听 myGeometryService.removeEventListener(GeometryServiceEvent.BUFFER_COMPLETE,bufferCompleteHandler); //获取buffer结果Graphic for each (var graphic : Graphic in event.graphics ) { //设置显示样式 graphic.symbol = sfs; //添加到GraphicsLayer进行显示 myGraphicsLayer.add( graphic ); var identifyParams:IdentifyParameters=new IdentifyParameters(); //查询结果需要返回Geometry identifyParams.returnGeometry=true; //查询冗余范围 identifyParams.tolerance=2; //宽 identifyParams.width = myMap.width; //高 identifyParams.height = myMap.height; //设置查询的Geometry identifyParams.geometry=graphic.geometry; //从ComboBox获取选择的图层index设置要查询的图层 //查询图层id为2的图层，就是States层 identifyParams.layerIds=[0]; //查询可见图层 //identifyParams.layerOption=IdentifyParameters.LAYER_OPTION_VISIBLE; identifyParams.mapExtent=myMap.extent; //进行查询 identifyTask.execute(identifyParams); } } //查询完成后执行的事件 private function identifyCompleteHandler(event:IdentifyEvent):void { var datas:Array=new Array(); // myGraphicsLayer.clear(); //遍历查询结果把查询到的feature添加到GraphicsLayer进行高亮显示 //同时把查询到的元素的名称添加到datas对象数组用来DataGrid显示用 for each (var result:IdentifyResult in event.identifyResults) { myGraphicsLayer.add(result.feature); /* datas.push(result.feature.attributes); //Alert.show(result.feature.attributes.toString()); */ datas.push({"value":result.value}); } //设置mx:DataGrid的数据源 datalist.dataProvider=datas; } ]]></mx:Script> <mx:Canvas width="700" height="600" borderStyle="solid" borderThickness="3" verticalCenter="16" left="10"> <esri:Map id="myMap" crosshairVisible="false" logoVisible="false" scaleBarVisible="true" > <esri:extent> <esri:Extent xmin="71" ymin="8" xmax="137" ymax="56"> <esri:SpatialReference wkid="4326"/> </esri:Extent> </esri:extent> <esri:ArcGISDynamicMapServiceLayer id="testlayer" url="http://localhost/ArcGIS/rest/services/ggg/MapServer" /> <esri:GraphicsLayer id="myGraphicsLayer" /> </esri:Map> </mx:Canvas> <mx:DataGrid id="datalist" height="398" verticalCenter="14" borderStyle="solid" borderThickness="3" left="708"> </mx:DataGrid> <esri:GeometryService id="myGeometryService" url="http://localhost/ArcGIS/rest/services/Geometry/GeometryServer"/>
<esri:SimpleFillSymbol id="sfs" color="0x00FF00" alpha="0.6"/>
<esri:Draw id="drawToolbar" map="{myMap}" graphicsLayer="{myGraphicsLayer}" drawEnd="drawEndHandler(event)" />
<mx:ToggleButtonBar verticalCenter="-300" itemClick="itemClickHandler(event)" toggleOnClick="true" left="11"> <mx:dataProvider> <mx:Array> <mx:Object icon="{point}" /> <mx:Object icon="{polyline}" /> <mx:Object icon="{polygon}" /> <mx:Object icon="{ext}" /> </mx:Array> </mx:dataProvider> </mx:ToggleButtonBar> <esri:IdentifyTask id="identifyTask" identifyComplete="identifyCompleteHandler(event)" url="http://localhost/ArcGIS/rest/services/ggg/MapServer"/></mx:Application>
