Use the addDataChild() method to add children to the data canvas. It adds labels to each of the columns that you select in the ColumnChart control.
<!--
Code from Flex 4 Documentation "Using Adobe Flex 4".
This user guide is licensed for use under the terms of the Creative Commons Attribution
Non-Commercial 3.0 License.
This License allows users to copy, distribute, and transmit the user guide for noncommercial
purposes only so long as
(1) proper attribution to Adobe is given as the owner of the user guide; and
(2) any reuse or distribution of the user guide contains a notice that use of the user guide is governed by these terms.
The best way to provide notice is to include the following link.
To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
-->
<!-- charts/AddLabelsWithLines.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"
height="600">
<s:layout>
<s:VerticalLayout />
</s:layout>
<fx:Script>
import mx.charts.series.items.ColumnSeriesItem;
import mx.charts.ChartItem;
private function connectTwoPoints(month1:String,value1:Number,month2:String,value2:Number):void {
canvas.clear();
canvas.lineStyle(4,0xCCCCCC,.75,true,LineScaleMode.NORMAL,CapsStyle.ROUND,JointStyle.MITER,2);
canvas.moveTo(month1, value1);
canvas.lineTo(month2, value2);
l1.text = "Month: " + month1;
l2.text = "Profit: " + value1;
l3.text = "Month: " + month2;
l4.text = "Profit: " + value2;
chartHasLine = true;
}
private var s1:String = new String();
private var s2:String = new String();
private var v1:Number = new Number();
private var v2:Number = new Number();
// Set this to true initially so that the chart doesn't
// draw a line when the first item is clicked.
private var chartHasLine:Boolean = true;
import mx.collections.ArrayCollection;
[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{month:"Jan", profit:20, expenses:15, amount:145},
{month:"Feb", profit:1, expenses:2, amount:60},
{month:"Mar", profit:15, expenses:5, amount:3}
]);
private function handleChange(event:Event):void {
var sci:ColumnSeriesItem =ColumnSeriesItem(myChart.selectedChartItem);
if (chartHasLine) {
canvas.clear();
s1 = sci.item.month;
v1 = sci.item.profit;
addLabelsToColumn(s1,v1);
chartHasLine = false;
} else {
s2 = sci.item.month;
v2 = sci.item.profit;
addLabelsToColumn(s2,v2);
connectTwoPoints(s1, v1, s2, v2);
}
}
[Bindable]
public var columnLabel:Label;
private function addLabelsToColumn(s:String, n:Number):void {
columnLabel = new Label();
columnLabel.setStyle("fontWeight", "bold");
columnLabel.setStyle("color", "0x660000");
columnLabel.text = s + ": " + "$" + n;
// This adds any DisplayObject as child to current canvas.
canvas.addDataChild(columnLabel, s, n);
}
</fx:Script>
<s:Panel title="Column Chart">
<s:layout>
<s:VerticalLayout />
</s:layout>
<mx:ColumnChart id="myChart" dataProvider="{expenses}"
selectionMode="single" change="handleChange(event)">
<mx:annotationElements>
<mx:CartesianDataCanvas id="canvas"
includeInRanges="true" />
</mx:annotationElements>
<mx:horizontalAxis>
<mx:CategoryAxis categoryField="month" />
</mx:horizontalAxis>
<mx:series>
<mx:ColumnSeries id="series1" xField="month" yField="profit"
displayName="Profit" selectable="true" />
</mx:series>
</mx:ColumnChart>
<mx:Legend dataProvider="{myChart}" />
<s:Button id="b1" label="Connect Two Points"
click="connectTwoPoints('Jan', 2000, 'Mar', 1500);" />
<s:HGroup>
<s:VGroup>
<s:Label text="First Item" />
<s:Label id="l1" />
<s:Label id="l2" />
</s:VGroup>
<s:VGroup>
<s:Label text="Second Item" />
<s:Label id="l3" />
<s:Label id="l4" />
</s:VGroup>
</s:HGroup>
</s:Panel>
</s:Application>
Related examples in the same category
