目的:
1.ArcGIS API for Flex实现Identify的功能,进行图查属性的功能,这样选择图层然后进行点、线、面的查询最好查到的地理元素高亮显示同时在右边的Grid中显示查到的数据。
准备工作:
1.在ArcGIS.Server.9.3发布一个叫usa的Map Service,并且把这个Service启动起来。
完成后的效果图:
开始:
1.启动Flex Builder3新建工程以及引入ArcGIS API for Flex library的开发包。
2.新建IdentifyTest.mxml页面,然后在页面上添加esri:Map控件设置esri:ArcGISDynamicMapServiceLayer等,这里还需要高亮显示被查询到的元素所以还需要esri:GraphicsLayer,具体代码如下:
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<mx:Canvas width="490" height="311" borderStyle="solid" borderThickness="3" borderColor="#425DE2" verticalCenter="-20" x="11">
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<esri:Map id="myMap">
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<mx:Panel x="209" y="-10" width="250" height="200" layout="absolute">
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</mx:Panel>
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<esri:ArcGISDynamicMapServiceLayer id="myMapServiceLayer" url="http://jh-53a435fbc0e8/ArcGIS/rest/services/USA/MapServer" complete="mapHandler(event)"/>
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<esri:GraphicsLayer id="myGraphicsLayer" symbolFunction="{mySymbolFunction}"/>
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</esri:Map>
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</mx:Canvas>
3.上面的代码中给ArcGISDynamicMapServiceLayer添加了一个complete事件用来当地图载入完成后获取地图的图层名称显示在地图上方的mx:ComboBox上,代码如下:
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//获取地图图层名称和index到ComboBox上
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private function mapHandler(event:Event):void
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{
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//获取图层信息数组
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var layerInfos:Array;
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layerInfos=myMapServiceLayer.layerInfos;
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var layers:Array = new Array();
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//遍历图层信息数组然后把图层的名称和index值添加到新的数组中
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for(var i:int=0;i<layerInfos.length;i++)
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{
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layers.push({label:layerInfos[i].name ,data:i});
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}
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//给ComboBox设定数据源
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layerList.dataProvider=layers;
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}
mx:ComboBox显示代码:
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<mx:ComboBox id="layerList" verticalCenter="-195" x="139"></mx:ComboBox>
4.上面的GraphicsLayer也添加了一个symbolFunction的功能,这个功能是当有元素添加到GraphicsLayer时进行元素显示样式的设置,这样分别对点、线、面进行样式设定,代码如下:
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private function mySymbolFunction(graphic:Graphic):Symbol
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{
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var result:Symbol;
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//根据元素的类型进行显示样式的设定
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switch(graphic.geometry.type)
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{
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case Geometry.GEOMETRY_POINT:
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{
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result=sms;
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break;
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}
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case Geometry.GEOMETRY_POLYLINE:
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{
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result=sls;
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break;
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}
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case Geometry.GEOMETRY_POLYGON:
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{
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result=sfs;
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break;
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}
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}
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return result;
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}
5.上面代码中的sms、sls、sfs是定义好的Symbol的id,具体定义如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<esri:SimpleLineSymbol id="sls" style="solid" color="0x00FF00" width="2" alpha="1"/>
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<esri:SimpleMarkerSymbol id="sms" style="diamond" color="0x00FF00" size="15"/>
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<esri:SimpleFillSymbol id="sfs"/>
6.要画图肯定还需要esri:Draw这个控件了,上一篇有比较详细的讲了这里就不说了,代码如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<esri:Draw id="drawToolbar" map="{myMap}" graphicsLayer="{myGraphicsLayer}" drawEnd="drawEndHandler(event)" />
7.接着添加mx:ToggleButtonBar了,添加3个子按钮分别是点、线、面的操作,具体代码如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<mx:ToggleButtonBar verticalCenter="-195" itemClick="itemClickHandler(event)" x="11" toggleOnClick="true">
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<mx:dataProvider>
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<mx:Array>
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<mx:Object icon="{point}" />
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<mx:Object icon="{polyline}" />
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<mx:Object icon="{polygon}" />
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</mx:Array>
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</mx:dataProvider>
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</mx:ToggleButtonBar>
8.ToggleButtonBar的itemClickHandler事件代码:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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private function itemClickHandler(event:ItemClickEvent):void
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{
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switch(event.index)
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{
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case 0:
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{
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drawToolbar.activate(Draw.MAPPOINT);
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break;
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}
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case 1:
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{
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drawToolbar.activate(Draw.POLYLINE);
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break;
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}
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case 2:
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{
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drawToolbar.activate(Draw.POLYGON);
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break;
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}
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}
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}
9.这样就实现了能在GraphicsLayer上画点、线、面的功能,接下来就是今天主要的代码就是在上面添加esri:Draw的时候给它添加了一个drawEnd="drawEndHandler(event)",这个就是当绘图完成后执行drawEndHandler(event)这个方法了,主要功能就是在这个方法里实现Identify的功能的,要实现Identify的功能还需要添加一个esri:IdentifyTask控件,这个就是实现Identify的功能的控件,添加控件代码如下:
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<esri:IdentifyTask id="identifyTask" identifyComplete="identifyCompleteHandler(event)" url="http://jh-53a435fbc0e8/ArcGIS/rest/services/USA/MapServer"/>
mx:DataGrid的显示代码:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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<mx:DataGrid id="datalist" height="311" borderStyle="solid" borderThickness="3" verticalCenter="-20" borderColor="#1B67D9" left="509">
drawEndHandler(event)的代码如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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private function drawEndHandler(event:DrawEvent):void
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{
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//获取绘图结果Geometry
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var geometry:Geometry=event.geometry;
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var identifyParams:IdentifyParameters=new IdentifyParameters();
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//查询结果需要返回Geometry
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identifyParams.returnGeometry=true;
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//查询冗余范围
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identifyParams.tolerance=3;
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//宽
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identifyParams.width = myMap.width;
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//高
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identifyParams.height = myMap.height;
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//设置查询的Geometry
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identifyParams.geometry=geometry;
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//从ComboBox获取选择的图层index设置要查询的图层
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var layers:Array=new Array();
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layers.push(layerList.value);
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identifyParams.layerIds=layers;
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//查询可见图层
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identifyParams.layerOption=IdentifyParameters.LAYER_OPTION_VISIBLE;
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identifyParams.mapExtent=myMap.extent;
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//进行查询
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identifyTask.execute(identifyParams);
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}
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//查询完成后执行的事件
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private function identifyCompleteHandler(event:IdentifyEvent):void
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{
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var datas:Array=new Array();
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//myGraphicsLayer.clear();
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//遍历查询结果把查询到的feature添加到GraphicsLayer进行高亮显示
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//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
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for each (var result:IdentifyResult in event.identifyResults)
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{
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myGraphicsLayer.add(result.feature);
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//datas.push(result.feature.attributes);
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datas.push({"value":result.value});
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}
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//设置mx:DataGrid的数据源
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datalist.dataProvider=datas;
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}
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10.这样就完成了所有的代码可以运行测试效果了。