如何在ColumnSeries中使用filterFunction

Question

我有一组如下数据：

        [Bindable]
    public var Loc:ArrayCollection = new ArrayCollection([
        {date:"2002", close:41.87, loc: "Location 01"},
        {date:"2003", close:45.74, loc: "Location 01"},
        {date:"2004", close:42.77, loc: "Location 01"},
        {date:"2005", close:48.06, loc: "Location 01"},
        {date:"2006", close:48.06, loc: "Location 01"},
        {date:"2002", close:157.59, loc: "Location 02"},
        {date:"2003", close:160.3, loc: "Location 02"},
        {date:"2004", close:150.71, loc: "Location 02"},
        {date:"2005", close:156.88, loc: "Location 02"},
    ]);

我想创建一个如下图表，其中每个位置以不同的颜色显示，并按年份分组：

我在想我必须使用“mx：ColumnSeries”标签并使用其“filterFunction”属性来定义如何将每个位置的数据过滤为单独的系列，但我不知道该怎么做。 anyboy是否有任何建议或示例代码来创建此类图表？ 谢谢

Answer 1

这是一个例子：

private function filterSeries1(cache:Array):Array
{
    var filteredCache:Array = [];
    for (var i:int = 0; i < cache.length; i++)
    {
        var item:ColumnSeriesItem = ColumnSeriesItem(cache[i]);
        if(item.item.loc == "Location 01")
            filteredCache.push(item);
    }
    return filteredCache;
}

private function filterSeries2(cache:Array):Array
{
    var filteredCache:Array = [];
    for (var i:int = 0; i < cache.length; i++)
    {
        var item:ColumnSeriesItem = ColumnSeriesItem(cache[i]);
        if(item.item.loc == "Location 02")
            filteredCache.push(item);
    }
    return filteredCache;
}

和

<mx:series>
    <mx:ColumnSeries yField="close" xField="date"
                     labelPosition="outside"
                     filterFunction="{filterSeries1}"/>
    <mx:ColumnSeries yField="close" xField="date"
                     labelPosition="outside"
                     filterFunction="{filterSeries2}"/>
</mx:series>