我正在制作一个关于 flex 的折线图,它使我能够根据年份查看数据的进度。我曾尝试使用滑块进行过滤,但似乎不起作用。
我不完全过滤数据提供者,而是过滤 alpha。我的函数将从我的数组集合中检索所有信息,但将 alpha 设置为 0,因此当用户拖动滑块时,如果年份低于该特定年份,它将显示数据,然后我将 alpha 设置为 100。
数据在那里,轴都设置好了,alpha设置为0。问题是它不会像我想要的那样逐行显示信息,而是只显示整个图表,直到我拖动滑块到最后。
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.rpc.events.ResultEvent;
[Bindable]
public var expenses:ArrayCollection = new ArrayCollection([
{Year:"1990", Profit:2000 },
{Year:"1991", Profit:1000 },
{Year:"1992", Profit:1500 },
{Year:"1993", Profit:2100 },
{Year:"1994", Profit:2500 },
{Year:"1995", Profit:1500 },
{Year:"1996", Profit:1900 },
]);
private function init():void {
expenses.filterFunction = sliderFilterFunc;
expenses.refresh();
}
private function sliderFilterFunc(item:Object):Boolean{
var result:Boolean = true;
pro.alpha=0;
if(item.Year<=slider.value || item.Year==slider.value)
{
pro.alpha=100;
return result;
}
return result;
}
]]></mx:Script>
<mx:VBox horizontalCenter="0" top="10" horizontalAlign="center" height="100%">
<mx:HSlider id="slider" minimum="1990" maximum="1996" value="220" liveDragging="true" change="init()" width="570" snapInterval="1" dataTipPrecision="0" labels="['1990','1996']" tickInterval="1" themeColor="#000000" borderColor="#FFFFFF" fillAlphas="[1.0, 1.0, 1.0, 1.0]" fillColors="[#000000, #000000, #FFFFFF, #1400D1]" height="48" styleName="myDataTip"/>
<mx:Panel title="Line Chart with One Shadow">
<mx:LineChart id="myChart" dataProvider="{expenses}" showDataTips="true" >
<mx:seriesFilters>
<mx:Array/>
</mx:seriesFilters>
<mx:horizontalAxis>
<mx:CategoryAxis
dataProvider="{expenses}"
categoryField="Year"
/>
</mx:horizontalAxis>
<mx:series>
<mx:LineSeries id="pro" alpha="0"
yField="Profit"
displayName="Profit"
/>
</mx:series>
</mx:LineChart>
<mx:Legend dataProvider="{myChart}" />
</mx:Panel>
</mx:VBox>
</mx:Application>