ArcGIS Api For Flex 划选查询功能的实现

如下图所示：



实现代码如下：

<?xml version=”1.0″encoding=”utf-8″?>

<s:Application xmlns:fx=”http://ns.adobe.com/mxml/2009”

xmlns:s=”library://ns.adobe.com/flex/spark”

xmlns:mx=”library://ns.adobe.com/flex/mx”xmlns:supportClasses=”com.esri.ags.skins.supportClasses.*” minWidth=”955″minHeight=”600″ xmlns:esri=”http://www.esri.com/2008/ags“>

<fx:Script>

<![CDATA[

import com.esri.ags.FeatureSet;

import com.esri.ags.Graphic;

import com.esri.ags.components.Navigation;

import com.esri.ags.events.DrawEvent;

import com.esri.ags.geometry.MapPoint;

import mx.controls.Alert;

import mx.controls.Image;

import mx.events.ItemClickEvent;

import mx.rpc.AsyncResponder;

private var hashmapOfExistingGraphics:Object = new Object();

protected functiontbb_itemClickHandler(event:ItemClickEvent):void

{

switch (event.item.label)

{

case "POLYGON": {myDrawTool.activate(DrawTool.POLYGON); break; }

case "ELLIPSE": {myDrawTool.activate(DrawTool.ELLIPSE);

break; }

}

}

protected functionmyDrawTool_drawEndHandler(event:DrawEvent):void

{

//释放

query.geometry=event.graphic.geometry;

//graphicslayer.clear();

query.outSpatialReference = Map1.spatialReference;

queryTask.execute(query, new AsyncResponder(onResult,onFault));

myDrawTool.deactivate();

tbb.selectedIndex = -1;

}

private function onResult(featureSet:FeatureSet, token:Object= null):void

{

for each (var myGraphic:Graphic in featureSet.features)

{

// only add features that are not already in thegraphics layer

var graphicID:String = myGraphic.attributes.NAME;

if (!hashmapOfExistingGraphics[graphicID]) // Newfeature (not already added to graphics layer)

{

hashmapOfExistingGraphics[graphicID] = 1;

myGraphic.id = graphicID;

myGraphic.toolTip =myGraphic.attributes.NAME;

myGraphic.symbol=sps;

graphicslayer.add(myGraphic);

}

}

}

private function onFault(info:Object, token:Object =null):void

{

Alert.show(info.toString());

}

]]>

</fx:Script>

<fx:Declarations>

<!– 将非可视元素（例如服务、值对象）放在此处 –>

<esri:PictureMarkerSymbol id=”sps” source=”http://localhost/Red_glow.swf“ width=”20″ height=”20″
/>

<esri:SimpleMarkerSymbol id=”sms”

color=”0x00FF00″

size=”12″

style=”square”/>

<!– Symbol for all line shapes –>

<esri:SimpleLineSymbol id=”sls”

width=”3″

color=”0x00FF00″/>

<!– Symbol for all polygon shapes –>

<esri:SimpleFillSymbol id=”sfs”

color=”0xFFFFFF”

style=”diagonalcross”>

<esri:outline>

<esri:SimpleLineSymbol width=”2″color=”0x00FF00″/>

</esri:outline>

</esri:SimpleFillSymbol>

<esri:QueryTask id=”queryTask”

showBusyCursor=”true”

url=”http://218.60.144.97:8080/RemoteRest/services/LN_SL/MapServer/9“

useAMF=”false”/>

<esri:Query id=”query”

outFields=”[NAME,ID]“

returnGeometry=”true”/>

<esri:DrawTool id=”myDrawTool” map=”{Map1}” drawEnd=”myDrawTool_drawEndHandler(event)” fillSymbol=”{sfs}”

graphicsLayer=”{graphicslayer}”

lineSymbol=”{sls}”

markerSymbol=”{sms}”/>

</fx:Declarations>

<esri:Map id=”Map1″ >

<!–<esri:ArcGISTiledMapServiceLayer

url=”http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer”/>–>

<esri:ArcGISDynamicMapServiceLayer url=”http://218.60.144.97:8080/RemoteRest/services/LN_SL/MapServer”/>

<esri:GraphicsLayer id=”graphicslayer”>

</esri:GraphicsLayer>

</esri:Map>

<mx:ToggleButtonBar id=”tbb” itemClick=”tbb_itemClickHandler(event)”toggleOnClick=”true”>

<fx:Object label=”POLYGON”/>

<fx:Object label=”ELLIPSE”/>

</mx:ToggleButtonBar>

</s:Application>