//需要注意的是1、不知道flex ags buffer是否支持自定义投影。因为buffer的spatial都要写wkid的
2、就是直接照着那个例子上的程序敲进去buffer不出来，查了半天知道了问题的所在原来是你要做buffer的图形必须有spatial
，看了一个例子是直接用featureSet.features[i].geometry可是查了帮助也没见features有geometry属性。解决办法
var featureSet:FeatureSet=new FeatureSet(); featureSet.features=[myGraphic];; var featureSet2:FeatureSet=new FeatureSet(); for(var i:int=0;i<featureSet.features.length;i++) { var graphic:Graphic=featureSet.features[i]; graphic.geometry.spatialReference=new SpatialReference(102100); featureSet2.features= [graphic]; } bufferParameters.features=featureSet2.features;
这样就算把空间信息赋值给了features
<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:esri="http://www.esri.com/2008/ags"> <mx:Canvas width="490" height="401" borderStyle="solid" borderThickness="3" verticalCenter="16" left="10"> <esri:Map id="myMap" crosshairVisible="true"> <esri:ArcGISDynamicMapServiceLayer 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="508"> </mx:DataGrid> <esri:GeometryService id="myGeometryService" url="http://localhost/ArcGIS/rest/services/Geometry/GeometryServer"/> <esri:SimpleFillSymbol id="sfs" color="0xFF0000" alpha="0.6"/> <esri:Draw id="drawToolbar" map="{myMap}" graphicsLayer="{myGraphicsLayer}" drawEnd="drawEndHandler(event)" /> <mx:ToggleButtonBar verticalCenter="-203" itemClick="itemClickHandler(event)" toggleOnClick="true" left="11"> <mx:dataProvider> <mx:Array> <mx:Object icon="{point}" /> <mx:Object icon="{polyline}" /> <mx:Object icon="{polygon}" /> </mx:Array> </mx:dataProvider> </mx:ToggleButtonBar> <esri:IdentifyTask id="identifyTask" identifyComplete="identifyCompleteHandler(event)" url="http://localhost/ArcGIS/rest/services/ggg/MapServer"/> <mx:Script> <![CDATA[ import com.esri.ags.geometry.Geometry; import com.esri.ags.tasks.FeatureSet; import com.esri.ags.tasks.IdentifyResult; import com.esri.ags.SpatialReference; import com.esri.ags.events.IdentifyEvent; import com.esri.ags.tasks.IdentifyParameters; import com.esri.ags.events.GeometryServiceEvent; import com.esri.ags.tasks.BufferParameters; import com.esri.ags.Graphic; import mx.events.ItemClickEvent; import com.esri.ags.events.DrawEvent; 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-poly.png")] public var polygon: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; } } } private function drawEndHandler(event:DrawEvent):void { var myGraphic:Graphic=event.graphic; //设置buffer参数 var bufferParameters:BufferParameters = new BufferParameters(); // bufferParameters.features=[myGraphic]; var featureSet:FeatureSet=new FeatureSet(); featureSet.features=[myGraphic];; var featureSet2:FeatureSet=new FeatureSet(); for(var i:int=0;i<featureSet.features.length;i++) { var graphic:Graphic=featureSet.features[i]; graphic.geometry.spatialReference=new SpatialReference(102100); featureSet2.features= [graphic]; } bufferParameters.features=featureSet2.features; //buffer距离半径 bufferParameters.distances = [2000]; //buffer单位 bufferParameters.unit = BufferParameters.UNIT_METER; //buffer空间参照系,102113为WKID是REST API定义好的空间参照系的id // bufferParameters.bufferSpatialReference = new SpatialReference(102113); //bufferParameters // bufferParameters. // bufferParameters.outSpatialReference=new SpatialReference(102025); bufferParameters.bufferSpatialReference=new SpatialReference(102100);//WGS_1984_Web_Mercator_Auxiliary_Sphere // bufferParameters.bufferSpatialReference=new SpatialReference(3349);//WGS_1984_PDC_Mercator //添加BUFFER_COMPLETE监听 myGeometryService.addEventListener(GeometryServiceEvent.BUFFER_COMPLETE,bufferCompleteHandler); //进行buffer分析 myGeometryService.buffer(bufferParameters); Alert.show("123"); // myGraphicsLayer.clear(); } private function bufferCompleteHandler(event:GeometryServiceEvent) : void { Alert.show("456"); 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=1; //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=[7]; //查询可见图层 identifyParams.layerOption=IdentifyParameters.LAYER_OPTION_VISIBLE; identifyParams.mapExtent=myMap.extent; //进行查询 identifyTask.execute(identifyParams); } } private function identifyCompleteHandler(event:IdentifyEvent):void { // myNav.activate(Navigation.PAN); 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); datas.push({"value":result.value}); } //设置mx:DataGrid的数据源 datalist.dataProvider=datas; } ]]> </mx:Script> </mx:Application>
