Flex 图表的使用(2.饼图)

<?xml version="1.0"?>
<!-- Simple example to demonstrate the PieChart control. -->
<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">
    <fx:Script>
        <![CDATA[          
            import mx.collections.ArrayCollection;
            
            [Bindable]
            private var medalsAC:ArrayCollection = new ArrayCollection( [
                { Country: "USA", Gold: 35, Silver:39, Bronze: 29 },
                { Country: "China", Gold: 32, Silver:17, Bronze: 14 },
                { Country: "Russia", Gold: 27, Silver:27, Bronze: 38 } ]);
            
            private function displayGold(data:Object, field:String, index:Number, percentValue:Number):String {
                var temp:String= (percentValue).toFixed(6);
                return data.Country + ": " + '\n' + "Total Gold: " + data.Gold + '\n' + temp + "%";
            }
        ]]>
    </fx:Script>
    
    <fx:Declarations>
        <!-- Define custom colors for use as pie wedge fills. -->
        <mx:SolidColor id="sc1" color="blue" alpha=".6"/>
        <mx:SolidColor id="sc2" color="red" alpha=".6"/>
        <mx:SolidColor id="sc3" color="0x663300" alpha=".6"/>
        
        <!-- This Stroke is used for the callout lines. -->
        <mx:SolidColorStroke id="callouts" weight="15" color="0x999999" alpha=".8" caps="square"/>
        
        <!-- This Stroke is used to separate the wedges in the pie. -->
        <mx:SolidColorStroke id="radial" weight="15" color="0xFFFFCC" alpha=".3"/>
        
        <!-- This Stroke is used for the outer border of the pie. -->
        <mx:SolidColorStroke id="pieborder" color="0x000000" weight="10" alpha=".5"/>
    </fx:Declarations>
    
    
    <mx:Panel title="Olympics 2004 Medals Tally Panel" height="100%" width="100%">
        <mx:PieChart id="chart" 
                     height="100%" 
                     width="100%"
                     paddingRight="5" 
                     paddingLeft="5" 
                     showDataTips="true" 
                     dataProvider="{medalsAC}"
                     >          
            <!--
            -->
            <mx:series>
                <mx:PieSeries 
                    nameField="Country"
                    labelPosition="callout" 
                    field="Gold" 
                    labelFunction="displayGold" 
                    calloutStroke="{callouts}" 
                    radialStroke="{radial}" 
                    stroke="{pieborder}"
                    fills="{[sc1, sc2, sc3]}"
                    >
                    <!-- Clear the drop shadow filters from the chart. -->
                    <mx:filters>
                        <fx:Array/>
                    </mx:filters>
                </mx:PieSeries>
            </mx:series>
        </mx:PieChart>  
        <mx:Legend dataProvider="{chart}"/>
    </mx:Panel>
</s:Application>