yValue of the ColumnSeriesItem represents the percentage a series takes up in a 100% chart

           
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<!-- charts/HitDataCastingWithPercent.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" initialize="init()">
    <mx:Script>
        import mx.collections.ArrayCollection;
        import mx.charts.HitData;
        import mx.charts.series.ColumnSeries;
        import mx.charts.series.items.ColumnSeriesItem;
        [Bindable]
        public var dataSet:ArrayCollection = new ArrayCollection([
            {Month:"Jan", Income:1500, Profit:90},
            {Month:"Feb", Income:1200, Profit:100},
            {Month:"Mar", Income:750, Profit:150}
            ]);
        public var b:Boolean = true;
        public function myDataTipFunction(e:HitData):String {
            var s:String;
            s = "<B>" + ColumnSeries(e.element).displayName + "</B>\n";
            s += "<I>Income:</I> <FONT COLOR='#339966'>$" + e.item.Income + "</FONT>\n";
            s += "<I>Expenses:</I> <FONT COLOR='#FF0000'>$" + (e.item.Income - e.item.Profit) + "</FONT>\n";
            s += "------------------------\n";
            s += "<I>Profit:</I> $" + e.item.Profit + "\n";
            // The value of the Income will always be 100%, so exclude adding that to the DataTip. Only
            // add percent when the user gets the Profit DataTip.
            var percentValue:Number = Number(ColumnSeriesItem(e.chartItem).yValue);
            if (percentValue < 100) {
                s += "Profit was equal to about <B>" +
                Math.round(percentValue) + "</B>% of the income.\n";
            }
            return s;
            //return e.item.Month + ":<B>$" + e.item.Profit + "</B>";
        }
      </mx:Script>
    <mx:Panel title="Accessing ChartItems from HitData Objects">
        <mx:ColumnChart id="myChart" dataProvider="{dataSet}" type="100%"
            dataTipFunction="myDataTipFunction" showDataTips="true">
            <mx:horizontalAxis>
                <mx:CategoryAxis categoryField="Month" />
            </mx:horizontalAxis>
            <mx:series>
                <mx:ColumnSeries yField="Profit" displayName="Profit '06" />
                <mx:ColumnSeries yField="Income" displayName="Income '06" />
            </mx:series>
        </mx:ColumnChart>
        <mx:Legend dataProvider="{myChart}" />
    </mx:Panel>
</mx:Application>

Related examples in the same category

1.	ColumnChart with ColumnSeries
2.	Use the fill property to set the color for each ColumnSeries object in a ColumnChart control
3.	Define a custom SolidColor object and a custom SolidColorStroke object, and applies them to the ColumnSeries object in the ColumnChart control.
4.	The following example mixes a LineSeries and a ColumnSeries
5.	The following example defines the colors for two series in the ColumnChart control:
6.	Adding Series to ColumnChart
7.	defines the colors for two series in the ColumnChart control
8.	Create a ColumnChart control with two series
9.	Data Update In Real Time Series
10.	uses two series to allow a visual comparison of two stocks that trade in different ranges
11.	Cast the HitData object to a Series class
12.	Set elementOffset property of SeriesInterpolate to 0.
13.	Increments and decrements the series's selectedIndex property to select each item
14.	Add or remove a data point from a series in ActionScript.
15.	Use a similar technique to add data series to your charts rather than replacing the existing ones
16.	Use chart items in more than one series
17.	Zoom in data series from the upper-right corner of the chart.
18.	Change fields of a series to change chart data at run time
19.	The final result is a chart with multiple axes, but whose series share some of the same properties defined by common axis renderers.

yValue of the ColumnSeriesItem represents the percentage a series takes up in a 100% chart : Column Chart ColumnSeries « Chart « Flex

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