当PieSeries中的所有数据等于0时,有没有办法强制Flex绘制空的PieChart。我现在得到的结果只是我的图表所在位置的空白区域。
答案 0 :(得分:0)
可能不完全是你想要的,但下面的例子会给你一个空的橙色图表,其中一个图例条目标记为空(你可能想保留完整的图例)。
alt text http://img9.imageshack.us/img9/7205/emptypiechart.jpg
禁用标签和数据提示,当所有值都设置为零时,运行一个函数来改变dataProvider(下面的代码可能会有所帮助)
<?xml version="1.0"?>
<!-- charts/BasicPie.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script><![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{Expense:"Taxes", Amount:1},
{Expense:"Rent", Amount:2},
{Expense:"Bills", Amount:3}
]);
private function removeItems(event:Event):void{
expenses.removeAll();
expenses.addItem({Expense:"Empty", Amount:1});
mySeries.setStyle("labelPosition", "false");
myChart.showDataTips = false;
}
]]></mx:Script>
<mx:Panel title="Pie Chart" width="442" height="536">
<mx:PieChart id="myChart"
dataProvider="{expenses}"
showDataTips="true"
themeColor="#121212" alpha="1.0" width="100%" height="100%">
<mx:series>
<mx:PieSeries
id="mySeries"
field="Amount"
nameField="Expense"
labelPosition="callout"
/>
</mx:series>
</mx:PieChart>
<mx:Button label="Remove items" click="removeItems(event)"/>
<mx:Legend dataProvider="{myChart}"/>
</mx:Panel>
</mx:Application>