改变LineChart组件的最大值，最小值范围.

示例：

br /> 代码：

<? xml version="1.0" ?>
<!--  http://blog.flexexamples.com/2007/11/19/setting-specific-minimum-and-maximum-ranges-for-a-flex-linechart-control-linearaxis/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white"
        preinitialize ="init();" >

     < mx:Script >
         <![CDATA[
            import mx.charts.chartClasses.IAxis;
            import mx.formatters.CurrencyFormatter;

            private var currFormatter:CurrencyFormatter;

            private function init():void {
                currFormatter = new CurrencyFormatter();
                currFormatter.precision = 2;
            }

            private function linearAxis_labelFunc(item:Object, prevValue:Object, axis:IAxis):String {
                return currFormatter.format(item);
            }

            private function lineChart_creationComplete():void {
                var linearAxisMinimum:int = Math.floor(linearAxis.computedMinimum);
                var linearAxisMaximum:int = Math.ceil(linearAxis.computedMaximum);
                linearAxis.minimum = linearAxisMinimum;
                linearAxis.maximum = linearAxisMaximum;
            }
         ]]>
     </ mx:Script >

     < mx:XMLListCollection  id ="dp" >
         < mx:source >
             < mx:XMLList >
                 < quote  date ="8/27/2007"  open ="40.38"  close ="40.81"   />
                 < quote  date ="8/24/2007"  open ="40.5"  close ="40.41"   />
                 < quote  date ="8/23/2007"  open ="40.82"  close ="40.6"   />
                 < quote  date ="8/22/2007"  open ="40.4"  close ="40.77"   />
                 < quote  date ="8/21/2007"  open ="40.41"  close ="40.13"   />
                 < quote  date ="8/20/2007"  open ="40.55"  close ="40.74"   />
                 < quote  date ="8/17/2007"  open ="40.18"  close ="40.32"   />
                 < quote  date ="8/16/2007"  open ="39.83"  close ="39.96"   />
                 < quote  date ="8/15/2007"  open ="40.22"  close ="40.18"   />
                 < quote  date ="8/14/2007"  open ="41.01"  close ="40.41"   />
                 < quote  date ="8/13/2007"  open ="41"  close ="40.83"   />
                 < quote  date ="8/10/2007"  open ="41.3"  close ="41.06"   />
                 < quote  date ="8/9/2007"  open ="39.9"  close ="40.75"   />
                 < quote  date ="8/8/2007"  open ="39.61"  close ="40.23"   />
                 < quote  date ="8/7/2007"  open ="39.08"  close ="39.42"   />
                 < quote  date ="8/6/2007"  open ="38.71"  close ="39.38"   />
                 < quote  date ="8/3/2007"  open ="39.47"  close ="38.75"   />
                 < quote  date ="8/2/2007"  open ="39.4"  close ="39.52"   />
                 < quote  date ="8/1/2007"  open ="40.29"  close ="39.58"   />
             </ mx:XMLList >
         </ mx:source >
     </ mx:XMLListCollection >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Form  styleName ="plain" >
             < mx:FormItem  label ="minimum:" >
                 < mx:HSlider  id ="minSlider"
                        minimum ="28"
                        maximum ="38"
                        value ="38"
                        liveDragging ="true"
                        snapInterval ="1"
                        change ="linearAxis.minimum = event.value;"   />
             </ mx:FormItem >
             < mx:FormItem  label ="maximum:" >
                 < mx:HSlider  id ="maxSlider"
                        minimum ="42"
                        maximum ="52"
                        value ="42"
                        liveDragging ="true"
                        snapInterval ="1"
                        change ="linearAxis.maximum = event.value;"   />
             </ mx:FormItem >
         </ mx:Form >

         < mx:Spacer  width ="100%"   />

         < mx:Legend  dataProvider =" {lineChart} "
                direction ="horizontal"   />
     </ mx:ApplicationControlBar >

     < mx:LineChart  id ="lineChart"
            showDataTips ="true"
            dataProvider =" {dp} "
            width ="100%"
            height ="100%"
            creationComplete ="lineChart_creationComplete();" >

         < mx:backgroundElements >
             < mx:GridLines  id ="gridLines"
                    direction ="both"
                    verticalTickAligned ="false" >
                 < mx:verticalStroke >
                     < mx:Stroke  color ="haloSilver"
                            weight ="0"
                            alpha ="1.0"   />
                 </ mx:verticalStroke >
                 < mx:horizontalStroke >
                     <!--  Set alpha to 0 so stroke isn't visible.  -->
                     < mx:Stroke  color ="white"
                            weight ="0"
                            alpha ="0.0"   />
                 </ mx:horizontalStroke >
                 < mx:horizontalFill >
                     < mx:SolidColor  color ="haloSilver"
                            alpha ="0.1"   />
                 </ mx:horizontalFill >
             </ mx:GridLines >
         </ mx:backgroundElements >

         <!--  vertical axis  -->
         < mx:verticalAxis >
             < mx:LinearAxis  id ="linearAxis"
                    baseAtZero ="false"
                    title ="Price (USD)"
                    minorInterval ="0.10"
                    interval ="0.5"
                    labelFunction ="linearAxis_labelFunc"   />
         </ mx:verticalAxis >

         <!--  horizontal axis  -->
         < mx:horizontalAxis >
             < mx:CategoryAxis  id ="ca"
                    categoryField ="@date"
                    title ="Date"   />
         </ mx:horizontalAxis >

         <!--  horizontal axis renderer  -->
         < mx:horizontalAxisRenderers >
             < mx:AxisRenderer  axis =" {ca} "
                    canDropLabels ="true"   />
         </ mx:horizontalAxisRenderers >

         <!--  series  -->
         < mx:series >
             < mx:LineSeries  yField ="@open"
                    displayName ="Open"   />
         </ mx:series >
     </ mx:LineChart >

</ mx:Application >