<?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" minWidth="955" minHeight="600" xmlns:esri="http://www.esri.com/2008/ags">
<fx:Script>
<![CDATA[
import com.esri.ags.Graphic;
import com.esri.ags.events.DrawEvent;
import com.esri.ags.events.GeometryServiceEvent;
import com.esri.ags.events.IdentifyEvent;
import com.esri.ags.geometry.Geometry;
import com.esri.ags.geometry.Polygon;
import com.esri.ags.tasks.supportClasses.BufferParameters;
import com.esri.ags.tasks.supportClasses.IdentifyParameters;
import com.esri.ags.tasks.supportClasses.IdentifyResult;
import com.esri.ags.utils.GeometryUtil;
import mx.events.ItemClickEvent;
import mx.rpc.AsyncResponder;
import mx.rpc.AsyncToken;
import mx.rpc.Fault;
import org.osmf.events.BufferEvent;
//设置ToggleButtonBar的itemClickhandler事件，用event.index属性获得目标button的序号
private function itemClickHandler(event:ItemClickEvent):void
{
switch(event.index)
{
case 0:
{
drawTool.activate(com.esri.ags.tools.DrawTool.MAPPOINT);
break;
}
case 1:
{
drawTool.activate(com.esri.ags.tools.DrawTool.POLYLINE);
break;
}
case 2:
{
drawTool.activate(com.esri.ags.tools.DrawTool.FREEHAND_POLYLINE);
break;
}
case 3:
{
drawTool.activate(com.esri.ags.tools.DrawTool.POLYGON);
break;
}
case 4:
{
drawTool.activate(com.esri.ags.tools.DrawTool.FREEHAND_POLYGON);
break;
}
}
}
//定义响应绘制完毕的ondrawEnd函数，注意参数是event:DrawEvent，首先把DrawTool绘制的graphic添加到GraphicsLayer中以便显示出来
//2 判断graphic的几何属性，以便于区别的缓冲分析，通过定义了bufferGeometry函数，参数是graphic的geometry属性
private function ondrawEnd(event:DrawEvent):void
{
var graphic:Graphic=event.graphic;
myGraphicsLayer.add(graphic);
switch (graphic.geometry.type)
{
case Geometry.MAPPOINT:
{
bufferGeometry(graphic.geometry);
break;
}
//下面这段笔者认为是把线拆成点数组，再进行缓冲分析（但实验这里没成功败笔啊）
case Geometry.POLYLINE:
{
GeometryUtil.normalizeCentralMeridian([graphic.geometry],myGeometryService,new AsyncResponder(getLine,faultHandler));
function getLine(item:Object,token:Object=null):void
{
bufferGeometry((item as Array)[0] as Geometry);
}
function faultHandler(fault:Fault,asyncToken:AsyncToken):void
{
}
break;
}
case Geometry.POLYGON:
{
var geometryPolygon:Polygon = graphic.geometry as Polygon;
myMap.centerAt(geometryPolygon.extent.center);
break;
}
}
//设置bufferGeometry函数，在进行缓冲分析要设置一个参数组bufferParameters进行传递,具体属性有geometries，distances，unit
//outSpatialReference,这里需要注意的是，在API旧版本中没有geometries属性（用来获得绘制图形的几何属性），而是一个
//features属性。
//myGeometryService.addEventListener(GeometryServiceEvent.BUFFER_COMPLETE, bufferCompleteHandler1);为myGeometryService添加
//一个事件侦听器，一旦myGeometryService.buffer(bufferParameters)事件结束，立即响应bufferCompleteHandler1函数
function bufferGeometry(geometry:Geometry):void
{
var bufferParameters:BufferParameters = new BufferParameters();
bufferParameters.geometries = [geometry];
bufferParameters.distances = [ Number(bText.text)];
bufferParameters.unit = GeometryService.UNIT_METER;
bufferParameters.outSpatialReference = myMap.spatialReference;
myGeometryService.addEventListener(GeometryServiceEvent.BUFFER_COMPLETE, bufferCompleteHandler1);
myGeometryService.buffer(bufferParameters);
}
//设置bufferCompleteHandler1函数，参数是event:GeometryServiceEvent，该参数拥有一个result属性，可以用遍历它获得返回的
//结果（这里应该是Polygon,因为result类型设置为Object），把返回的结果添加到GraphicsLayer中显示
//接下来定义了一个identityParams参数组用来传递，具体参数有returnGeometry，tolerance等，其中有一个参数需要注意
//layerIds是图层的序号（实验是获得State图层，所以识别也是在这一图层）最后就是调用execute了identifyTask.execute(identifyParams);
function bufferCompleteHandler1(event:GeometryServiceEvent):void
{
for each (var polygon:Polygon in event.result)
{
var graphic:Graphic = new Graphic(polygon);
graphic.symbol = sfs;
myGraphicsLayer.add(graphic);
var identifyParams:IdentifyParameters=new IdentifyParameters();
identifyParams.returnGeometry=true;
identifyParams.tolerance=1;
identifyParams.width = myMap.width;
identifyParams.height = myMap.height;
identifyParams.geometry=graphic.geometry;
identifyParams.layerIds=[2];
identifyParams.mapExtent=myMap.extent;
identifyTask.execute(identifyParams);
}
myGeometryService.removeEventListener(GeometryServiceEvent.BUFFER_COMPLETE, bufferCompleteHandler1);
}
}
//设置IdentitifyTask识别结束后响应函数identifyCompleteHandler，参数是event:IdentifyEvent，该参数拥有一个identifyResults
//属性，也就是返回结果，另外设置了一个data数组获取返回结果的值，最终赋予表格resultTable.
private function identifyCompleteHandler(event:IdentifyEvent):void
{
var datas:Array=new Array();
for each(var result:IdentifyResult in event.identifyResults)
{
myGraphicsLayer.add(result.feature);
datas.push({"value":result.value});
}
resultTable.dataProvider=datas;
}
]]>
</fx:Script>
<fx:Declarations>
<!-- 将非可视元素（例如服务、值对象）放在此处 -->
//设置绘制的符号化
<esri:SimpleLineSymbol id="sls"
width="1"
alpha="1"
color="0xFF0000"
style="dash"/>
<!-- Symbol for Point -->
<esri:SimpleMarkerSymbol id="sms"
color="0xFF0000"
size="10"
style="square">
<esri:SimpleLineSymbol width="2" color="0x00FF00"/>
</esri:SimpleMarkerSymbol>
<!-- Symbol for Polygon -->
<esri:SimpleFillSymbol id="sfs" alpha="0.8">
<esri:SimpleLineSymbol width="4"
alpha="1"
color="#FF0000"
style="solid"/>
</esri:SimpleFillSymbol>
//定义了一个绘图工具，绘制完毕响应ondrawEnd函数
<esri:DrawTool id="drawTool"
drawEnd="ondrawEnd(event)"
fillSymbol="{sfs}"
lineSymbol="{sls}"
map="{myMap}"
markerSymbol="{sms}"/> //下面设置了一个几何服务，本例子主要用来进行缓冲分析
<esri:GeometryService id="myGeometryService" url="http://shibaizhong-pc/ArcGIS/rest/services/Geometry/GeometryServer"/>
<esri:IdentifyTask id="identifyTask" executeComplete="identifyCompleteHandler(event)"
url="http://shibaizhong-pc/ArcGIS/rest/services/USA/MapServer"/>
<esri:Extent id="allUsa" xmin="-183.780014745329" ymin="16.2975638854873" xmax="-61.4068547410964" ymax="74.0304580085983"/>
</fx:Declarations>
<s:layout>
<s:HorizontalLayout/>
</s:layout>
<s:BorderContainer height="100%" width="80%" borderStyle="solid" borderWeight="2" borderColor="#439AD7">
<s:layout>
<s:VerticalLayout paddingLeft="10" paddingTop="10">
</s:VerticalLayout>
</s:layout>
<mx:ToggleButtonBar id="tbb"
creationComplete="tbb.selectedIndex = -1"
itemClick="itemClickHandler(event)"
toggleOnClick="true"
valueCommit="if (tbb.selectedIndex == -1) { drawTool.deactivate() }">
<mx:dataProvider>
<fx:Object id="p0" icon="@Embed(source='/assets/measure-point.png')"/>
<fx:Object id="p1" icon="@Embed(source='/assets/measure-line.png')"/>
<fx:Object id="p2"
icon="@Embed(source='/assets/measure-line.png')"
label="FreeHand"/>
<fx:Object id="p3" icon="@Embed(source='/assets/measure-poly.png')"/>
<fx:Object id="p4"
icon="@Embed(source='/assets/measure-poly.png')"
label="FreeHand"/>
</mx:dataProvider>
</mx:ToggleButtonBar>
<mx:ControlBar width="100%">
<s:Label text="缓冲距离 (点线):"/>
<mx:TextInput id="bText" //用来获取缓冲分析的距离；
width="45"
maxChars="5"
text="100000"
textAlign="right"/>
<s:Label text=" meters."/>
</mx:ControlBar>
<esri:Map id="myMap" logoVisible="false" panArrowsVisible="true" extent="{allUsa}">
<esri:ArcGISDynamicMapServiceLayer url="http://shibaizhong-pc/ArcGIS/rest/services/USA/MapServer"/>
<esri:GraphicsLayer id="myGraphicsLayer"/>
</esri:Map>
</s:BorderContainer>
<mx:DataGrid id="resultTable" height="100%" width="17%" borderStyle="solid" borderColor="#D6D7D8"/>
</s:Application>
View Code
