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带有空数据的饼图

发布于 2024-09-13 04:15:28 字数 85 浏览 7 评论 0原文

当 PieSeries 中的所有数据都等于 0 时，有什么方法可以强制 Flex 绘制空 PieChart。我现在得到的结果只是我的图表应该在的位置的空白。

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伊面 2024-09-20 04:15:28

可能不完全是您想要的，但下面的示例将为您提供一个空的橙色图表，其中有一个标记为空的图例条目（您可能希望保留完整的图例）。

禁用标签和数据提示，当所有值设置为零时，运行一个函数来更改 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>

Probably not exactly what you want, but the example below will give you an empty orange chart, with a single legend entry labeled Empty (you probably want to keep the full Legend).

Disable the labels and datatips, and when all values are set to zero, run a function to alter the dataProvider (the code below might be of some help)

<?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>

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