Flex中用鼠标拖动LineChart图表的折线

    有很多数据点，要用折线将它们的变化趋势画出来，于是选择用LineChart控件。由于数据点过多，第次只显示一部分（每次画10个数据点），另外的数据点随着鼠标左右拖动显示和消失：鼠标向右拖动时，右边的数据点依次消失，左边的数据点依次画出；鼠标向左拖动时，左边的数据点依次消失，右边的数据点依次画出。就像google地图一样，鼠标向左拖动，地图就跟着左移；鼠标向右，地图向右……

    代码如下：

<textarea cols="50" rows="15" name="code" class="javascript">&lt;mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()"&gt; &lt;mx:Script&gt; &lt;!--[CDATA[ import mx.charts.series.LineSeries; import mx.collections.ArrayCollection; import mx.controls.Alert; import mx.events.MoveEvent; private var expensesAC:ArrayCollection = new ArrayCollection( [//全部数据 { Month: "Jan", Profit: 2000 }, { Month: "Feb", Profit: 1000 }, { Month: "Mar", Profit: 1500 }, { Month: "Apr", Profit: 1800 }, { Month: "May", Profit: 2400 }, { Month: "六月", Profit: 2000 }, { Month: "七月", Profit: 1000 }, { Month: "八月", Profit: 1500 }, { Month: "九月", Profit: 1800 }, { Month: "十月", Profit: 2400 } ]); [Bindable] private var showData:ArrayCollection = new ArrayCollection();//定义要显示的临时数据 private var firstIndex:int, lastIndex:int; private function init():void { for(var i:int=0; i&lt;5; i++) showData.addItem(expensesAC[i]); firstIndex = 0; lastIndex = 4; } private var oldX:Number,oldY:Number; private function onMouseMove(event:MouseEvent):void { if(event.buttonDown) { var addx:Number = 0; addx = event.stageX - oldX;//变化的x坐标 if(addx &gt;= 15) { if(lastIndex &lt; expensesAC.length-1) { showData.removeItemAt(0);//删除临时数据的头一个数据点 showData.addItem(expensesAC[lastIndex+1]);//增加一个新的数据点 firstIndex ++ ; lastIndex ++ ; addx = 0; oldX = event.stageX; } else { Alert.show("已是最后一个数据点!"); } } if(addx &lt;= -15) { if(firstIndex &gt; 0) { showData.removeItemAt(4);//删除临时数据的头一个数据点 showData.addItemAt(expensesAC[firstIndex-1],0)//增加一个新的数据点 firstIndex -- ; lastIndex -- ; addx = 0; oldX = event.stageX; } else { Alert.show("已是第一个数据点!"); } } } } private function onMouseDown(event:MouseEvent):void { oldX = event.stageX;//按下鼠标时的x坐标 } private function moveLeft():void { if(firstIndex &gt;0 ) { showData.removeItemAt(4);//删除临时数据的头一个数据点 showData.addItemAt(expensesAC[firstIndex-1],0)//增加一个新的数据点 firstIndex -- ; lastIndex -- ; } else { Alert.show("已是第一个数据点!"); } } private function moveRight():void { if(lastIndex &lt; expensesAC.length-1 ) { showData.removeItemAt(0);//删除临时数据的头一个数据点 showData.addItem(expensesAC[lastIndex+1]);//增加一个新的数据点 firstIndex ++ ; lastIndex ++ ; } else { Alert.show("已是最后一个数据点!"); } } ]]--&gt; &lt;/mx:Script&gt; &lt;mx:Panel title="LineChart and AreaChart Controls Example" height="100%" width="100%" layout="vertical"&gt; &lt;mx:LineChart id="linechart" height="100%" width="100%" paddingLeft="5" paddingRight="5" showDataTips="true" dataProvider="{showData}" mouseMove="onMouseMove(event)" mouseDown="onMouseDown(event)"&gt; &lt;mx:horizontalAxis&gt; &lt;mx:CategoryAxis categoryField="Month"/&gt; &lt;/mx:horizontalAxis&gt; &lt;mx:series&gt; &lt;mx:LineSeries id="profitSeries" yField="Profit" displayName="Profit" itemRenderer = "mx.charts.renderers.CircleItemRenderer" /&gt; &lt;/mx:series&gt; &lt;/mx:LineChart&gt; &lt;mx:Canvas width="100%"&gt; &lt;mx:Legend dataProvider="{linechart}" x="0" height="33" y="10"/&gt; &lt;mx:Button label="左移" x="569" y="11" click="moveLeft()"/&gt; &lt;mx:Button label="右移" x="660" y="11" click="moveRight()"/&gt; &lt;/mx:Canvas&gt; &lt;/mx:Panel&gt; &lt;/mx:Application&gt;</textarea>