Mega Code Archive
Use data binding to make your chart reflect data changes in real time
<![CDATA[
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Code from Flex 4 Documentation "Using Adobe Flex 4".
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<!-- charts/WatchingCollections.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
initialize="initData();" height="600">
<fx:Declarations>
<mx:SeriesInterpolate id="interp" elementOffset="0"
duration="300" minimumElementDuration="0" />
</fx:Declarations>
<fx:Script>
import mx.collections.ArrayCollection;
[Bindable]
public var dataSet:ArrayCollection;
[Bindable]
public var revenue:Number = 100;
private var t:Timer;
private function initData():void {
dataSet = new ArrayCollection();
t = new Timer(500);
}
private function startApp():void {
t.addEventListener(TimerEvent.TIMER, addData);
t.start();
}
private function addData(e:Event):void {
/* Add a maximum of 100 data points before user has to click
the Start button again. */
if (dataSet.length > 100) {
stopApp();
}
dataSet.addItem( { revenue: revenue } );
revenue += Math.random() * 10 - 5;
}
private function stopApp():void {
t.stop();
t.removeEventListener(TimerEvent.TIMER, addData);
}
</fx:Script>
<s:layout>
<s:VerticalLayout />
</s:layout>
<s:Panel title="Line Chart">
<s:layout>
<s:HorizontalLayout />
</s:layout>
<mx:LineChart id="myChart" dataProvider="{dataSet}">
<mx:series>
<mx:LineSeries yField="revenue" showDataEffect="{interp}"
displayName="Revenue" />
</mx:series>
<mx:horizontalAxis>
<mx:LinearAxis autoAdjust="false" />
</mx:horizontalAxis>
</mx:LineChart>
<mx:Legend dataProvider="{myChart}" />
</s:Panel>
<s:HGroup>
<s:Button id="b1" label="Start" click="startApp()" />
<s:Button id="b2" label="Stop" click="stopApp()" />
</s:HGroup>
</s:Application>
]]>