Flex中如何通过horizontalTickAligned和verticalTickAligned样式指定线图LineChart横竖方向轴心标记的例子

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原文http://blog.minidx.com/2008/12/03/1669.html

接下来的例子演示了Flex中如何通过horizontalTickAligned和verticalTickAligned样式，指定线图LineChart横竖方向轴心标记。

让我们先来看一下Demo（可以右键View Source或点击这里察看源代码）：

下面是完整代码(或点击这里察看)：

Download: main.mxml

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<mx:Script>
<![CDATA[
import mx.charts.CategoryAxis;
import mx.charts.chartClasses.IAxis;
private function linearAxis_labelFunc(item:Object, prevValue:Object, axis:IAxis):String {
return currFormatter.format(item);
}
private function categoryAxis_labelFunc(item:Object, prevValue:Object, axis:CategoryAxis, categoryItem:Object):String {
var datNum:Number = Date.parse(item);
var tempDate:Date = new Date(datNum);
return tempDate.date.toString();
}
]]>
</mx:Script>
<mx:CurrencyFormatter id="currFormatter" precision="2" />
<mx:XMLListCollection id="dp">
<mx:source>
<mx:XMLList>
<quote date="8/1/2007" open="40.29" close="39.58" />
<quote date="8/2/2007" open="39.4" close="39.52" />
<quote date="8/3/2007" open="39.47" close="38.75" />
<quote date="8/6/2007" open="38.71" close="39.38" />
<quote date="8/7/2007" open="39.08" close="39.42" />
<quote date="8/8/2007" open="39.61" close="40.23" />
<quote date="8/9/2007" open="39.9" close="40.75" />
<quote date="8/10/2007" open="41.3" close="41.06" />
<quote date="8/13/2007" open="41" close="40.83" />
<quote date="8/14/2007" open="41.01" close="40.41" />
<quote date="8/15/2007" open="40.22" close="40.18" />
<quote date="8/16/2007" open="39.83" close="39.96" />
<quote date="8/17/2007" open="40.18" close="40.32" />
<quote date="8/20/2007" open="40.55" close="40.74" />
<quote date="8/21/2007" open="40.41" close="40.13" />
<quote date="8/22/2007" open="40.4" close="40.77" />
<quote date="8/23/2007" open="40.82" close="40.6" />
<quote date="8/24/2007" open="40.5" close="40.41" />
<quote date="8/27/2007" open="40.38" close="40.81" />
</mx:XMLList>
</mx:source>
</mx:XMLListCollection>
<mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="direction:">
<mx:ComboBox id="comboBox">
<mx:dataProvider>
<mx:Array>
<mx:Object label="both" />
<mx:Object label="horizontal" />
<mx:Object label="vertical" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
</mx:FormItem>
<mx:FormItem label="horizontalTickAligned:">
<mx:CheckBox id="hCheckBox" selected="true" />
</mx:FormItem>
<mx:FormItem label="verticalTickAligned:">
<mx:CheckBox id="vCheckBox" selected="true" />
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar>
<mx:LineChart id="lineChart"
showDataTips="true"
dataProvider="{dp}"
width="100%"
height="100%">
<mx:backgroundElements>
<mx:GridLines direction="{comboBox.selectedItem.label}"
horizontalTickAligned="{hCheckBox.selected}"
verticalTickAligned="{vCheckBox.selected}">
<mx:horizontalFill>
<mx:SolidColor color="haloBlue" alpha="0.2" />
</mx:horizontalFill>
<mx:horizontalAlternateFill>
<mx:SolidColor color="haloSilver" alpha="0.2" />
</mx:horizontalAlternateFill>
<mx:verticalFill>
<mx:SolidColor color="haloBlue" alpha="0.2" />
</mx:verticalFill>
<mx:verticalAlternateFill>
<mx:SolidColor color="haloSilver" alpha="0.2" />
</mx:verticalAlternateFill>
</mx:GridLines>
</mx:backgroundElements>
<mx:verticalAxis>
<mx:LinearAxis baseAtZero="false"
title="Price"
labelFunction="linearAxis_labelFunc" />
</mx:verticalAxis>
<mx:horizontalAxis>
<mx:CategoryAxis id="ca"
categoryField="@date"
title="August 2007"
labelFunction="categoryAxis_labelFunc" />
</mx:horizontalAxis>
<mx:horizontalAxisRenderers>
<mx:AxisRenderer axis="{ca}" canDropLabels="true" />
</mx:horizontalAxisRenderers>
<mx:series>
<mx:LineSeries yField="@open" displayName="Open" />
<mx:LineSeries yField="@close" displayName="Close" />
</mx:series>
<mx:seriesFilters>
<mx:Array />
</mx:seriesFilters>
</mx:LineChart>
</mx:Application>