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：
Flex多样化饼图样式（颜色渐变，点击分离，环形）