目的:
1.ArcGIS API for Flex实现在MapTips中显示饼图进行数据统计展示,在本例子中可以点击城市的MapTip后显示详细人口年龄段的统计饼图的功能。
准备工作:
1.在ArcGIS.Server.9.3发布一个叫California的Map Service,并且把这个Service启动起来,这次需要一些数据用来进行图表显示了,California的数据比较齐全了所以本例采用这个数据。
2.底图的话采用Esri在线数据http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer
完成后的效果图:
开始:
1.启动Flex Builder3新建工程以及引入1.0正式版的ArcGIS API for Flex library的开发包。
2.新建chartInfowindow.mxml页面,添加Map、ArcGISTiledMapServiceLayer、ArcGISDynamicMapServiceLayer、GraphicsLayer等。具体代码如下:
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<esri:Extent id="myExtent" xmin="-124.162751982246" ymin="32.5782548652585" xmax="-114.589241057072" ymax="40.9473919319488" />
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<mx:Canvas width="669" height="600" borderStyle="solid" borderThickness="3" verticalCenter="0" left="10">
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<esri:Map id="myMap" extent="{myExtent}">
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<esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />
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<esri:ArcGISDynamicMapServiceLayer url="http://jh-53a435fbc0e8/ArcGIS/rest/services/California/MapServer">
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<esri:visibleLayers>
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<mx:ArrayCollection>
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<mx:Number>1</mx:Number>
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</mx:ArrayCollection>
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</esri:visibleLayers>
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</esri:ArcGISDynamicMapServiceLayer>
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<esri:GraphicsLayer id="myGraphicsLayer"/>
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</esri:Map>
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</mx:Canvas>
3.上面的代码以ESRI_StreetMap_World_2D的ArcGISTiledMapServiceLayer为底图。在底图上只显示California的Cities的点图层,具体看ArcGISDynamicMapServiceLayer部分的设置。添加了一个GraphicsLayer用来显示MapTip了,同时设置了以California的范围为当前底图的Extent。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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4.接下来需要用esri:InfoSymbol来实现mapTip,代码如下:
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<esri:InfoSymbol id="ifs">
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<esri:infoRenderer>
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<mx:Component>
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<mx:VBox width="100%" height="100%" backgroundColor="0xEEEEEE" click="clickHandler()" rollOver="rollOverHandler()" rollOut="rollOutHandler()" >
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<mx:Style>
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.InfoCloseButton
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{
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disabledSkin: Embed(source="assets/skins.swf",symbol="Callout_closeButtonDisabledSkin");
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downSkin: Embed(source="assets/skins.swf",symbol="Callout_closeButtonDownSkin");
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overSkin: Embed(source="assets/skins.swf",symbol="Callout_closeButtonOverSkin");
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upSkin: Embed(source="assets/skins.swf",symbol="Callout_closeButtonUpSkin");
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}
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.InfoExpandButton
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{
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disabledSkin: Embed(source="assets/skins.swf",symbol="Callout_expandButtonDisabledSkin");
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downSkin: Embed(source="assets/skins.swf",symbol="Callout_expandButtonDownSkin");
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overSkin: Embed(source="assets/skins.swf",symbol="Callout_expandButtonOverSkin");
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upSkin: Embed(source="assets/skins.swf",symbol="Callout_expandButtonUpSkin");
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}
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</mx:Style>
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<mx:Script>
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<![CDATA[
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import mx.collections.ArrayCollection;
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private function clickHandler():void
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{
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switch(currentState )
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{
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case "" :
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currentState = "TitleState";
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break;
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case "TitleState":
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currentState = "DetailState";
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break;
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case "DetailState":
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currentState = "TitleState";
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break;
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}
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}
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private function rollOverHandler() : void
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{
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if(currentState == null || currentState == "" )
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{
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currentState = "TitleState";
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}
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}
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private function rollOutHandler() : void
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{
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if( currentState == "TitleState" )
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{
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currentState = "";
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}
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}
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]]>
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</mx:Script>
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<mx:states>
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<mx:State name="TitleState">
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<!-- relativeTo相对于其添加子项的对象、position子项的位置 -->
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<mx:AddChild relativeTo="{titleBar}" position="lastChild">
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<mx:Label id="titleLabel" fontWeight="bold" fontSize="15" text="{data.getItemAt(0).AREANAME}"/>
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</mx:AddChild>
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<mx:AddChild relativeTo="{titleBar}" position="lastChild">
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<mx:Button id="expandButton" styleName="InfoExpandButton" width="18" height="18" />
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</mx:AddChild>
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</mx:State>
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<!-- basedOn属性可以设置是基于哪个State -->
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<mx:State name="DetailState" basedOn="TitleState">
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<mx:RemoveChild target="{expandButton}" />
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<mx:AddChild relativeTo="{titleBar}" position="lastChild">
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<mx:Spacer width="100%" />
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</mx:AddChild>
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<mx:AddChild relativeTo="{titleBar}" position="lastChild">
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<mx:Button id="closeButton" styleName="InfoCloseButton" width="18" height="18" />
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</mx:AddChild>
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<mx:AddChild relativeTo="{this}">
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<mx:PieChart id="pieChart" dataProvider="{data}" width="250" height="200" showDataTips="true">
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<mx:series>
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<mx:PieSeries field="VALUE" nameField="AGE" labelPosition="callout">
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<mx:calloutStroke>
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<mx:Stroke weight="0" color="0x000000" alpha="100"/>
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</mx:calloutStroke>
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<mx:radialStroke>
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<mx:Stroke weight="0" color="#FFFFFF" alpha="20"/>
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</mx:radialStroke>
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<mx:stroke>
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<mx:Stroke color="0" alpha="20" weight="2"/>
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</mx:stroke>
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</mx:PieSeries>
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</mx:series>
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</mx:PieChart>
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</mx:AddChild>
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<mx:AddChild>
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<mx:Legend dataProvider="{pieChart}" direction="horizontal" horizontalGap="10" width="250" />
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</mx:AddChild>
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</mx:State>
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</mx:states>
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<!--状态切换时的动画效果 -->
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<mx:transitions>
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<mx:Transition fromState="*" toState="TitleState">
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<mx:Resize target="{this}" duration="100"/>
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</mx:Transition>
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<mx:Transition fromState="TitleState" toState="DetailState">
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<mx:Resize target="{this}" duration="100"/>
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</mx:Transition>
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<mx:Transition fromState="DetailState" toState="*">
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<mx:Resize target="{this}" duration="100"/>
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</mx:Transition>
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<mx:Transition fromState="TitleState" toState="*">
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<mx:Resize target="{this}" duration="100"/>
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</mx:Transition>
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</mx:transitions>
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<mx:HBox id="titleBar" width="100%" height="100%" >
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<mx:Image source="@Embed(source='assets/pie_chart.gif')" width="18" height="18" />
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</mx:HBox>
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</mx:VBox>
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</mx:Component>
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</esri:infoRenderer>
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</esri:InfoSymbol>
5.上面的代码有点多了但是并不复杂了,整个代码就是定义一个id为ifs的esri:InfoSymbol,主要部分为TitleState和DetailState的2种视图状态的设置和鼠标移上去的rollOverHandler方法、鼠标移开的rollOutHandler方法、鼠标点击的clickHandler方法定义。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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6.完成上面的工作后,接下来要做的就是在地图上显示MapTip了,这里就去部分的California的Cities的点图层数据了,在<mx:Application 添加mx:initialize用来实现初始化载入MapTip的显示,具体代码和说明如下:
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<mx:initialize>
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<![CDATA[
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var queryTask : QueryTask = new QueryTask("http://jh-53a435fbc0e8/ArcGIS/rest/services/California/MapServer/1");
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var query : Query = new Query();
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//查询条件取OBJECTID大于600的;
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query.where="OBJECTID >600";
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//返回Geometry
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query.returnGeometry = true;
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//设置返回字段
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query.outFields = ["AREANAME","AGE_UNDER5","AGE_5_17","AGE_18_21","AGE_22_29","AGE_30_39","AGE_40_49","AGE_50_64","AGE_65_UP"];
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//进行查询
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queryTask.execute(query, new AsyncResponder( onResult, onFault ));
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//查询成功后执行方法
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function onResult( featureSet : FeatureSet, token : Object = null ) : void
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{
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for each ( var myGraphic : Graphic in featureSet.features )
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{
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//设置显示的symbol
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myGraphic.symbol = ifs;
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//添加到GraphicsLayer中进行显示
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myGraphicsLayer.add( myGraphic );
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//属性数组
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var object : ArrayCollection = new ArrayCollection
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([
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄低于5岁" , VALUE : myGraphic.attributes.AGE_UNDER5},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄5-17岁", VALUE : myGraphic.attributes.AGE_5_17},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄18-21岁",VALUE : myGraphic.attributes.AGE_18_21},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄22-29岁",VALUE : myGraphic.attributes.AGE_22_29},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄30-39岁",VALUE : myGraphic.attributes.AGE_30_39},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄40-49岁",VALUE : myGraphic.attributes.AGE_40_49},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄50-64岁",VALUE : myGraphic.attributes.AGE_50_64},
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{AREANAME : myGraphic.attributes.AREANAME,AGE : "年龄65岁以上",VALUE : myGraphic.attributes.AGE_65_UP}
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]);
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//设置属性
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myGraphic.attributes = object;
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}
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}
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//查询失败后执行方法
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function onFault( info : Object, token : Object = null ) : void
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{
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Alert.show(info.toString());
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}
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]]>
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</mx:initialize>
7.这样就完成的功能的开发,这个例子的代码相对简单了主要的是esri:InfoSymbol的定义以及mx:PieChart控件的使用。![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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