• arcgis api for flex之专题图制作(饼状图,柱状图等)


    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"
                   xmlns:s="library://ns.adobe.com/flex/spark"
                   xmlns:mx="library://ns.adobe.com/flex/mx"
                   xmlns:esri="http://www.esri.com/2008/ags"
                   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"
              xmlns:s="library://ns.adobe.com/flex/spark"
              xmlns:mx="library://ns.adobe.com/flex/mx"
              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"
              xmlns:s="library://ns.adobe.com/flex/spark"
              xmlns:mx="library://ns.adobe.com/flex/mx"
              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"
              xmlns:s="library://ns.adobe.com/flex/spark"
              xmlns:mx="library://ns.adobe.com/flex/mx"
              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。

    备注:

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  • 原文地址:https://www.cnblogs.com/llguanli/p/8721258.html
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