Flex多样化饼图样式（颜色渐变，点击分离，环形）

转自http://xaajie.iteye.com/blog/399239

创建一个简单的环形饼图，通过PieChart的innerRadius属性进行设置实现环形效果：

 <?xml version="1.0" encoding="utf-8"?>
 <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
        <mx:Script>
         <![CDATA[
       import mx.collections.ArrayCollection;
       import mx.charts.HitData;
         [Bindable]
         public var chengjiPie:ArrayCollection = new ArrayCollection( [
             { classs: "60分以下", num: 5 },
             { classs: "60~70分", num: 4 },
             { classs: "70~80分", num:5},
             { classs: "80~90分", num: 4},
             { classs: "90分以上", num: 3}]);

         private function displayGold(data:Object, field:String, index:Number, percentValue:Number):String {
             var temp:String= (" " + percentValue).substr(0,6);
             return data.classs + ": " +  '\n' + temp + "%";
         }

         ]]>

     </mx:Script>

     <mx:SolidColor id="sc1" color="0xE46899" alpha=".6"/>
     <mx:SolidColor id="sc2" color="0xAAD71A" alpha=".6"/>
     <mx:SolidColor id="sc3" color="0xFFE30E" alpha=".6"/>
     <mx:SolidColor id="sc4" color="0xFDB500" alpha=".6"/>
     <mx:SolidColor id="sc5" color="0x4CD0EF" alpha=".6"/>


     <mx:Stroke id="callouts" weight="2" color="0x999999" alpha=".8" caps="square"/>
     <mx:Stroke id="radial" weight="1" color="0xFFFFCC" alpha=".3"/>
     <mx:Stroke id="pieborder" color="0x000000" weight="2" alpha=".5"/>


     <mx:Panel  height="100%" width="100%" layout="absolute" fontSize="12">

       <mx:PieChart id="chart"  showDataTips="true" width="100%" height="100%"
                  dataProvider="{chengjiPie}" innerRadius=".3" horizontalCenter="0" verticalCenter="0">

                 <mx:series>
                     <mx:Array>
                         <mx:PieSeries nameField="classs" labelPosition="callout"  field="num"
                                       labelFunction="displayGold" >

                         </mx:PieSeries>
                     </mx:Array>
                 </mx:series>

             </mx:PieChart>
         <mx:Legend dataProvider="{chart}" right="0" bottom="0"/>
     </mx:Panel>

 </mx:Application>

 

 在这个简单饼图的基础上进行一些改动：

1 添加饼图上颜色块的渐变效果，用到RadialGradient标签.

2 实现鼠标点击，该块分离的效果，对PieSeries进行相关属性设置，explodeRadius:分离程度。PerWedgeExplodeRadius:数组规定出每一块的分离值。

3 添加动态效果，点击时的弹动变化。showDataEffect标签处添加Elastic.easeOut震动效果。

 

 <?xml version="1.0" encoding="utf-8"?>
 <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
        <mx:Script>
         <![CDATA[
       import mx.collections.ArrayCollection;
       import mx.charts.HitData;
       import mx.effects.easing.*;
         [Bindable]
         public var chengjiPie:ArrayCollection = new ArrayCollection( [
             { classs: "60分以下", num: 5 },
             { classs: "60~70分", num: 4 },
             { classs: "70~80分", num:5},
             { classs: "80~90分", num: 4},
             { classs: "90分以上", num: 3}]);

         private function displayGold(data:Object, field:String, index:Number, percentValue:Number):String {
             var temp:String= (" " + percentValue).substr(0,6);
             return data.classs + ": " +  '\n' + temp + "%";
         }

         private var _selectedRegion:Object;

         public function get selectedRegion():Object
         {
             return _selectedRegion;
         }

         public function set selectedRegion(item:Object):void
         {
             _selectedRegion = item;

             var index:int = -1;
             for (var i:int=0; i < chengjiPie.length && index == -1; i++)
             {
                 if (chengjiPie[i].classs == item.classs)
                     index = i;
             }

             var explodeData:Array = [];
             explodeData[index] = 0.15;
             chart.series[0].perWedgeExplodeRadius = explodeData;
         }

         private function regionChange(item:Object):void
         {
             selectedRegion = item;
             dispatchEvent(new Event("regionChange"));
         }

        private function formatDataTip(hitData:HitData):String
         {
             var classs:String = hitData.item.classs;
             var num:Number = hitData.item.num;
             return classs;
         }

         ]]>

     </mx:Script>

     <mx:SolidColor id="sc1" color="0xE46899" alpha=".6"/>
     <mx:SolidColor id="sc2" color="0xAAD71A" alpha=".6"/>
     <mx:SolidColor id="sc3" color="0xFFE30E" alpha=".6"/>
     <mx:SolidColor id="sc4" color="0xFDB500" alpha=".6"/>
     <mx:SolidColor id="sc5" color="0x4CD0EF" alpha=".6"/>


     <mx:Stroke id="callouts" weight="2" color="0x999999" alpha=".8" caps="square"/>
     <mx:Stroke id="radial" weight="1" color="0xFFFFCC" alpha=".3"/>
     <mx:Stroke id="pieborder" color="0x000000" weight="2" alpha=".5"/>


     <mx:Panel  height="100%" width="100%" layout="absolute" fontSize="12">

       <mx:PieChart id="chart"  showDataTips="true" width="100%" height="100%"
                 itemClick="regionChange(event.hitData.item)"  dataProvider="{chengjiPie}"  horizontalCenter="0" verticalCenter="0">

                 <mx:series>
                     <mx:Array>
                         <mx:PieSeries nameField="classs" labelPosition="callout"  field="num"
                                       labelFunction="displayGold" >
                               <mx:showDataEffect>
                                <mx:SeriesInterpolate duration="1500" easingFunction="{Elastic.easeOut}" />
                               </mx:showDataEffect>

                          <mx:fills>
                             <mx:Array>
                                 <mx:RadialGradient>
                                     <mx:entries>
                                         <mx:Array>
                                             <mx:GradientEntry color="#EF7651" ratio="0"/>
                                             <mx:GradientEntry color="#994C34" ratio="1"/>
                                         </mx:Array>
                                     </mx:entries>
                                 </mx:RadialGradient>
                                 <mx:RadialGradient>
                                     <mx:entries>
                                         <mx:Array>
                                             <mx:GradientEntry color="#E9C836" ratio="0"/>
                                             <mx:GradientEntry color="#AA9127" ratio="1"/>
                                         </mx:Array>
                                     </mx:entries>
                                 </mx:RadialGradient>
                                 <mx:RadialGradient>
                                     <mx:entries>
                                         <mx:Array>
                                             <mx:GradientEntry color="#6FB35F" ratio="0"/>
                                             <mx:GradientEntry color="#497B54" ratio="1"/>
                                         </mx:Array>
                                     </mx:entries>
                                 </mx:RadialGradient>
                                 <mx:RadialGradient>
                                     <mx:entries>
                                         <mx:Array>
                                             <mx:GradientEntry color="#A1AECF" ratio="0"/>
                                             <mx:GradientEntry color="#47447A" ratio="1"/>
                                         </mx:Array>
                                     </mx:entries>
                                 </mx:RadialGradient>
                                 <mx:RadialGradient>
                                     <mx:entries>
                                         <mx:Array>
                                             <mx:GradientEntry color="#BA9886" ratio="0"/>
                                             <mx:GradientEntry color="#AE775B" ratio="1"/>
                                         </mx:Array>
                                     </mx:entries>
                                 </mx:RadialGradient>
                             </mx:Array>
                         </mx:fills>
                         </mx:PieSeries>
                     </mx:Array>
                 </mx:series>

             </mx:PieChart>
         <mx:Legend dataProvider="{chart}" right="0" bottom="0"/>
     </mx:Panel>

 </mx:Application>

 

 除此之外，http://demo.quietlyscheming.com/variablePieCharts/SizedPieCharts.html上通过继承对ChartPie组件的相关属性进行重新定义，使得每个扇形的半径根据数据的大小进行变化。实现如下效果：

 
 

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