Rotating a Flex PieChart control when a user clicks on an item

The following example shows how you can rotate a PieChart in Flex when the user clicks on an item. This allows you to make sure that the clicked item always appears at 0 degrees rotation (off to the right).

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

layout="vertical"

verticalAlign="middle"

backgroundColor="white">

<mx:Script>

<![CDATA[

import mx.charts.series.items.PieSeriesItem;

import mx.charts.events.ChartItemEvent;

private function pieChart_itemClick(evt:ChartItemEvent):void {

var item:PieSeriesItem = evt.hitData.chartItem as PieSeriesItem;

var degrees:Number = radiansToDegrees(item.startAngle);

var arr:Array = [];

if (checkBox.selected) {

arr[item.index] = 0.2;

}

pieSeries.perWedgeExplodeRadius = arr;

pieSeries.startAngle -= degrees;

}

private function radiansToDegrees(radians:Number):Number {

return radians * (180 / Math.PI);

}

]]>

</mx:Script>

<mx:XML id="dp">

<products>

<product label="Product 1" data="3" />

<product label="Product 2" data="1" />

<product label="Product 3" data="4" />

<product label="Product 4" data="1" />

<product label="Product 5" data="5" />

<product label="Product 6" data="9" />

</products>

</mx:XML>

<mx:ApplicationControlBar dock="true">

<mx:CheckBox id="checkBox"

label="Use perWedgeExplodeRadius:"

labelPlacement="left"

selected="true" />

</mx:ApplicationControlBar>

<mx:PieChart id="pieChart"

dataProvider="{dp.product}"

itemClick="pieChart_itemClick(event);"

height="100%"

width="100%">

<mx:series>

<mx:PieSeries id="pieSeries"

field="@data"

labelPosition="callout">

<mx:stroke>

<mx:Stroke color="black" weight="0" />

</mx:stroke>

<mx:filters>

<mx:Array />

</mx:filters>

</mx:PieSeries>

</mx:series>

</mx:PieChart>

</mx:Application>

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Rotating a Flex PieChart control when a user clicks on an item

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