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arcgis api for flex 开发入门（八）GP服务的使用

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arcgis api for flex 开发入门（八）GP服务的使用
在arcgis api for flex中esri还为我们提供了GP服务，在ARCGISONLINE 上的gp

服务有CreateDriveTimePolygons和Viewshed，下面我们以

CreateDriveTimePolygons服务为例来看看在arcgis api for flex中如何使用GP

服务。
首先使用 <esri:Geoprocessor >标签创建一个gp服务，url指向提供gp服务的

地址。
<esri:Geoprocessor id="gp"

url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Network

/ESRI_DriveTime_US/GPServer/CreateDriveTimePolygons" />
O$]YdGa0剩下的步骤和上一讲Geometry service的使用基本相同，即设置参数，调用gp服

务，得到结果，表现结果。

9hC!O,?m.w"]v0Flash:demo
C&j+R ~[J i0
我们直接看一下下面的代码和例子就ok了，这个例子比较简单。

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
u^|V$\"i7V b0    pageTitle="Service Area"
-}@c DWL8bC0    xmlns:esri="http://www.esri.com/2008/ags"
`u)FDkN.bgF0    layout="absolute"
-KrWL$H0>
    <mx:Script>
        <![CDATA[
            // Synopsis:
            // The map has a click event that calls computeServiceArea(event) when you click the map
            //      <esri:Map click="computeServiceArea(event)">
            // The computeServiceArea function sends a request to a GP task to create the geometries for the different drive times
            // The return drivetime features are used as the graphicProvider for a graphics layer.
            //      graphicsLayer.graphicProvider = fs.features;
            // The graphics layer is using a symbolFunction which will symbolize the drivetimes in different colors
8`S"f o(oY$^0            //      <esri:GraphicsLayer id="graphicsLayer" symbolFunction="fillFunc"/>
            // The fillFunc() is using the "ToBreak" attributes, which the GP task returned, to set different symbols on different drive times.

            import com.esri.ags.Graphic;
~UBi9dW^0            import com.esri.ags.symbol.Symbol;
            import com.esri.ags.tasks.ExecuteResult;
/{L1EE-X ^;L0            import com.esri.ags.tasks.FeatureSet;
            import com.esri.ags.tasks.ParameterValue;
            import com.esri.ags.geometry.MapPoint;
Uf4y5xZ0            import com.esri.ags.geometry.Geometry;
            import mx.controls.Alert;
            import mx.rpc.AsyncResponder;
5w+R!_k]ol0            import mx.utils.ObjectUtil;

private var driveTimes:String = "1 2 3";

            private function computeServiceArea( event : MouseEvent ) : void
            {
pd$a9_*c/}+H T:y0                graphicsLayer.clear();

var mapPoint : MapPoint = myMap.toMapFromStage(event.stageX, event.stageY);
#{\/gz[&N D@G7Lv0 var graphic : Graphic = new Graphic(mapPoint, sms_circleAlphaSizeOutline);

graphicsLayer.add(graphic);

var featureSet:FeatureSet = new FeatureSet([graphic]);

                var params:Object = {
                    "Input_Location" : featureSet,
                    "Drive_Times" : driveTimes
                };
:vxN+Lid,V0                gp.execute(params, new AsyncResponder( onResult, onFault ));
                function onResult(
                    gpResult : ExecuteResult,
7b(\tu`{0                    token : bject = null
                ) : void
                {
                    var pv : ParameterValue = gpResult.parameterValues[0];
~vL`~]d3l0                    var fs : FeatureSet = pv.value as FeatureSet;
                    graphicsLayer.graphicProvider = fs.features;
o9f!iQF.mX0                }
                function onFault( info : Object, token : bject = null ) : void
q.X(G {1?)J0                {
                    Alert.show( info.toString() );
/E`'Neel0                }
1PiU2gkf&G,o-^0            }

            private function fillFunc( g : Graphic ) : Symbol
            {
7`%s1vf"s G0                var toBreak : Number = g.attributes.ToBreak;
                if ( toBreak == 1 )
                {
!tkJi|"z0                    return rFill;
                }
                if ( toBreak == 2 )
Bmsz&[ }:i0                {
P Q6iY3gK0                    return gFill;
                }
$m-QVeT%y)x9R0                return bFill;
            }
:x;}1M;x(nc%u0        ]]>
)s9Vwym3KH_1B0    </mx:Script>

<esri:SimpleMarkerSymbol id="sms_circleAlphaSizeOutline" alpha="0.5" size="15" style="circle"/>

    <esri:SimpleFillSymbol id="rFill" alpha="0.5" color="0xFF0000"/>
    <esri:SimpleFillSymbol id="gFill" alpha="0.5" color="0x00FF00"/>
q!@K a@D|g0    <esri:SimpleFillSymbol id="bFill" alpha="0.5" color="0x0000FF"/>

    <esri:Map id="myMap" click="computeServiceArea(event)" penHandCursorVisible="false">
@Lk4{C&W9i0        <esri:extent>
            <esri:Extent xmin="-95.41" ymin="38.86" xmax="-95.1" ymax="39.06"/>
+eb5a;n*awg,bC7_0        </esri:extent>
        <esri:ArcGISTiledMapServiceLayer
            url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
QZyV2E+T Ur3}0        <esri:GraphicsLayer id="graphicsLayer" symbolFunction="fillFunc"/>
$t a8bqcr6aSv0    </esri:Map>

    <esri:Geoprocessor
O}C3n*G!q'h2As0        id="gp"
4bJp6nXM0        url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Network/ESRI_DriveTime_US/GPServer/CreateDriveTimePolygons"
        />
b7G;sU,H!\ b0|2w)T0</mx:Application>