拖动折现变化

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="init()">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Declarations>

</fx:Declarations>

<fx:Script>
<![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<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 >= 15)
{
if(lastIndex < 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 <= -15)
{
if(firstIndex > 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 >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 < 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!");
}
}
]]>
</fx:Script>

<mx:Panel title="LineChart and AreaChart Controls Example" height="100%" width="100%" layout="vertical">
<mx:LineChart id="linechart" height="100%" width="100%" paddingLeft="5" paddingRight="5" showDataTips="true" dataProvider="{showData}" mouseMove="onMouseMove(event)" mouseDown="onMouseDown(event)">
<mx:horizontalAxis>
<mx:CategoryAxis categoryField="Month"/>
</mx:horizontalAxis>
<mx:series>
<mx:LineSeries id="profitSeries" yField="Profit" displayName="Profit" itemRenderer = "mx.charts.renderers.CircleItemRenderer" />
</mx:series>
</mx:LineChart>
<mx:Canvas width="100%">
<mx:Legend dataProvider="{linechart}" x="0" height="33" y="10"/>
<mx:Button label="左移" x="569" y="11" click="moveLeft()"/>
<mx:Button label="右移" x="660" y="11" click="moveRight()"/>
</mx:Canvas>
</mx:Panel>
</s:Application>