Flex：在LineChart图表中创建一个自定义的LinearAxis函数标签(Tip提示)的例子

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">

<mx:Script>
<![CDATA[
import mx.charts.chartClasses.IAxis;

private function linearAxis_labelFunc(item:Object, prevValue:Object, axis:IAxis):String {
return currFormatter.format(item);
}
]]>
</mx:Script>

<mx:CurrencyFormatter id="currFormatter" precision="2" />

<mx:XMLListCollection id="dp">
<mx:source>
<mx:XMLList>
<quote date="8/1/2007" open="40.29" close="39.58" />
<quote date="8/2/2007" open="39.4" close="39.52" />
<quote date="8/3/2007" open="39.47" close="38.75" />
<quote date="8/6/2007" open="38.71" close="39.38" />
<quote date="8/7/2007" open="39.08" close="39.42" />
<quote date="8/8/2007" open="39.61" close="40.23" />
<quote date="8/9/2007" open="39.9" close="40.75" />
<quote date="8/10/2007" open="41.3" close="41.06" />
<quote date="8/13/2007" open="41" close="40.83" />
<quote date="8/14/2007" open="41.01" close="40.41" />
<quote date="8/15/2007" open="40.22" close="40.18" />
<quote date="8/16/2007" open="39.83" close="39.96" />
<quote date="8/17/2007" open="40.18" close="40.32" />
<quote date="8/20/2007" open="40.55" close="40.74" />
<quote date="8/21/2007" open="40.41" close="40.13" />
<quote date="8/22/2007" open="40.4" close="40.77" />
<quote date="8/23/2007" open="40.82" close="40.6" />
<quote date="8/24/2007" open="40.5" close="40.41" />
<quote date="8/27/2007" open="40.38" close="40.81" />
</mx:XMLList>
</mx:source>
</mx:XMLListCollection>

<mx:LineChart id="lineChart"
showDataTips="true"
dataProvider="{dp}"
width="100%"
height="100%">

<!-- vertical axis -->
<mx:verticalAxis>
<mx:LinearAxis baseAtZero="false"
title="Price"
labelFunction="linearAxis_labelFunc" />
</mx:verticalAxis>

<!-- horizontal axis -->
<mx:horizontalAxis>
<mx:CategoryAxis id="ca"
categoryField="@date"
title="Date" />
</mx:horizontalAxis>

<!-- horizontal axis renderer -->
<mx:horizontalAxisRenderers>
<mx:AxisRenderer axis="{ca}"
canDropLabels="true" />
</mx:horizontalAxisRenderers>

<!-- series -->
<mx:series>
<mx:LineSeries yField="@open"
form="curve"
displayName="Open" />
</mx:series>

<!-- series filters -->
<mx:seriesFilters>
<mx:Array />
</mx:seriesFilters>
</mx:LineChart>

</mx:Application>