近期公司给我一个任务,就是利用arcgis api for flex实如今地图上点(业务数据)直接显示饼状图以及柱状图的专题图制作。而不是通过点击点显示气泡窗体的形式来实现。这个公司已经实现了。
经过一段时间的摸索,參照一些网上资源,眼下大概弄出来了,里面还有待完好的地方的。
效果图例如以下:
(1)Chart.mxml,基本的展示地图专题图效果的页面
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<?xml
version= "1.0" encoding= "utf-8" ? <s:Application
xmlns:fx= "http://ns.adobe.com/mxml/2009" pageTitle= "Charts
in infowindow" xmlns:symbols= "com.esri.ags.symbols.*" > <fx:Style> .chartStyle { borderThickness: 0 ; infoPlacement:
center; backgroundAlpha: 0 ; infoOffsetX: 0 ; infoOffsetY: 0 ; paddingLeft: 0 ; paddingRight: 0 ; paddingTop: 0 ; paddingBottom: 0 ; } </fx:Style> <fx:Script> <![CDATA[ import com.esri.ags.geometry.MapPoint; import com.esri.ags.FeatureSet; import com.esri.ags.Graphic; import com.esri.ags.events.MapEvent; import com.esri.ags.tasks.QueryTask; import com.esri.ags.tasks.supportClasses.Query; import mx.collections.ArrayCollection; import mx.controls.Alert; import mx.events.FlexEvent; import mx.rpc.AsyncResponder; protected function myMap_initializeHandler(event:MapEvent): void { var pie:MapPoint
= new MapPoint( 113.55185 , 22.82289 ); var column:MapPoint
= new MapPoint( 113.59637985600011 , 22.758225999000047 ); var bar:MapPoint
= new MapPoint( 113.52757794 , 22.84012158 ); var gpie:Graphic
= new Graphic(pie); var gcolumn:Graphic
= new Graphic(column); var gbar:Graphic
= new Graphic(bar); //g.attributes
= new Object(); var thematic:ArrayCollection
= new ArrayCollection( [ {
Name: "危化品1" ,
Rate: 25 }, {
Name: "危化品2" ,
Rate: 15 }, {
Name: "危化品3" ,
Rate: 23 } ]); //g.attributes.thematic
= thematic; gpie.attributes
= thematic; gcolumn.attributes
= thematic; gbar.attributes
= thematic; this .myGraphicsLayerpie.add(gpie); this .myGraphicsLayercolumn.add(gcolumn); this .myGraphicsLayerbar.add(gbar); } ]]> </fx:Script> <fx:Declarations> <esri:InfoSymbol
id= "infoSymbolpie" infoRenderer= "InfoRendererPieChart" containerStyleName= "chartStyle" > </esri:InfoSymbol> <esri:InfoSymbol
id= "infoSymbolcolumn" infoRenderer= "InfoRendererColumnChart" containerStyleName= "chartStyle" > </esri:InfoSymbol> <esri:InfoSymbol
id= "infoSymbolbar" infoRenderer= "InfoRendererBarChart" containerStyleName= "chartStylee" > </esri:InfoSymbol> </fx:Declarations> <esri:Map
id= "myMap" load= "myMap_initializeHandler(event)" > <esri:extent> <esri:Extent
xmin= "113.284171273203" ymin= "22.6348519473499" xmax= "113.774816132605" ymax= "22.9103935318251" > <esri:spatialReference> <esri:SpatialReference
wkid= "4326" /> </esri:spatialReference> </esri:Extent> </esri:extent> <esri:ArcGISTiledMapServiceLayer
url= "http://localhost:6080/ArcGIS/rest/services/ns_new/MapServer" /> <esri:GraphicsLayer
id= "myGraphicsLayercolumn" symbol= "{infoSymbolcolumn}" > </esri:GraphicsLayer> <esri:GraphicsLayer
id= "myGraphicsLayerpie" symbol= "{infoSymbolpie}" > </esri:GraphicsLayer> <esri:GraphicsLayer
id= "myGraphicsLayerbar" symbol= "{infoSymbolbar}" > </esri:GraphicsLayer> </esri:Map> </s:Application> |
(2)InfoRendererBarChart.mxml、InfoRendererColumnChart.mxml、InfoRendererPieChart.mxml。各自是柱状图以及饼状图实现的页面
1.InfoRendererBarChart.mxml
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<?xml
version= "1.0" encoding= "utf-8" ?> <s:VGroup
xmlns:fx= "http://ns.adobe.com/mxml/2009" clipAndEnableScrolling= "true" creationComplete= "creationCompleteHandler()" implements = "mx.core.IDataRenderer" width= "100" height= "100" > <!-- This is used
by the QueryResultsWithChart sample. --> <fx:Script> <![CDATA[ private var _data: Object ; [Bindable] //
implement IDataRenderer public function get data(): Object { return _data; } public function set data(value: Object ): void { _data
= value; } private function creationCompleteHandler(): void { } ]]> </fx:Script> <mx:BarChart
id= "columnChart" width= "100%" height= "100%" dataProvider= "{data}" showDataTips= "true" > <mx:series> <mx:BarSeries
id= "barSeries" xField= "Rate" /> </mx:series> <mx:verticalAxis> <mx:CategoryAxis
id= "barAxis" categoryField= "Name" /> </mx:verticalAxis> <mx:verticalAxisRenderers> <mx:AxisRenderer
axis= "{barAxis}" showLabels= "false" /> </mx:verticalAxisRenderers> </mx:BarChart> </s:VGroup> |
2.InfoRendererColumnChart.mxml
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<?xml
version= "1.0" encoding= "utf-8" ?> <s:VGroup
xmlns:fx= "http://ns.adobe.com/mxml/2009" clipAndEnableScrolling= "true" creationComplete= "creationCompleteHandler()" implements = "mx.core.IDataRenderer" width= "100" height= "100" > <!-- This is used
by the QueryResultsWithChart sample. --> <fx:Script> <![CDATA[ private var _data: Object ; [Bindable] //
implement IDataRenderer public function get data(): Object { return _data; } public function set data(value: Object ): void { _data
= value; } private function creationCompleteHandler(): void { } ]]> </fx:Script> <mx:ColumnChart
id= "columnChart" width= "100%" height= "100%" dataProvider= "{data}" showDataTips= "true" > <mx:series> <mx:ColumnSeries
id= "columnSeries" yField= "Rate" /> </mx:series> <mx:horizontalAxis> <mx:CategoryAxis
id= "columnAxis" categoryField= "Name" /> </mx:horizontalAxis> <mx:horizontalAxisRenderers> <mx:AxisRenderer
axis= "{columnAxis}" showLabels= "false" /> </mx:horizontalAxisRenderers> </mx:ColumnChart> </s:VGroup> |
3.InfoRendererPieChart.mxml
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<?xml
version= "1.0" encoding= "utf-8" ?> <s:VGroup
xmlns:fx= "http://ns.adobe.com/mxml/2009" clipAndEnableScrolling= "true" creationComplete= "creationCompleteHandler()" implements = "mx.core.IDataRenderer" width= "100" height= "100" > <!-- This is used
by the QueryResultsWithChart sample. --> <fx:Script> <![CDATA[ private var _data: Object ; [Bindable] //
implement IDataRenderer public function get data(): Object { return _data; } public function set data(value: Object ): void { _data
= value; } private function creationCompleteHandler(): void { } ]]> </fx:Script> <mx:PieChart
id= "pieChart" width= "100%" height= "100%" dataProvider= "{data}" showDataTips= "true" > <mx:series> <mx:PieSeries
field= "Rate" labelPosition= "callout" nameField= "Name" > </mx:PieSeries> </mx:series> </mx:PieChart> </s:VGroup> |
上述的整体实现思路是这种:核心是InfoSymbol。InfoSymbol自己定义infoRenderer绑定专题图的模版。比方InfoRendererBarChart.mxml、InfoRendererColumnChart.mxml、InfoRendererPieChart.mxml;程序初始化的时候生成了一些带有统计信息的Graphic加入到地图上。这些Graphic对象的attributes属性集合来保存各个统计的对象,每一个统计的对象包括两个字段:Name表示危化品名称,Rate表示占有比重,以下我们会在InfoSymbol的定义中再次看到这两个字段。当定义好这些Graphic对象以后,我们就能够把它们加入到设置了InfoSymbol符号的GraphicLayer上了。在InfoSymbol的定义中,我们能够看到,在这个InfoSymbol中加入了一个饼图组件PieChart,这个饼图的dataProvider属性绑定的是{data},它代表的事实上就是Graphic对象的attributes属性。你能够简单地这样觉得:InfoSymbol中的data代表的就是其相应的Graphic对象的attributes属性。
其它的柱状图也是同理的。
既然在InfoSymbol中能够获得Graphic的属性信息,那么依据Graphic的属性信息来绘制不同的专题图就是水到渠成的事情了。
样式代码解析:
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.chartStyle { borderThickness: 0 ; /*显示专题图的边框宽度*/ infoPlacement:
center; /*显示专题图的位置,这里是中心*/ backgroundAlpha: 0 ; /*显示专题图的背景透明度。这里设置为0。是为了隐藏背景*/ infoOffsetX: 0 ; /*显示专题图的X偏移,设置0。不然会偏离原始点位置*/ infoOffsetY: 0 ; /*显示专题图的Y偏移,设置0,不然会偏离原始点位置*/ paddingLeft: 0 ; /*显示专题图的位置偏移,设置0,不然会偏离原始点位置*/ paddingRight: 0 ; /*显示专题图的位置偏移,设置0。不然会偏离原始点位置*/ paddingTop: 0 ; /*显示专题图的位置偏移。设置0,不然会偏离原始点位置*/ paddingBottom: 0 ; /*显示专题图的位置偏移,设置0,不然会偏离原始点位置*/ } |
须要完好优化之处:眼下GraphicsLayer定义了三个(pie,bar。column),然后各自绑定不同的infoSymbol(pie,bar,column)。这样显的有点冗余了,事实上仅仅要定义一个GraphicsLayer,然后动态的推断绑定的是哪个infoSymbol。
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