LogAxis

套件	mx.charts
類別	public class LogAxis
繼承	LogAxis NumericAxis AxisBase EventDispatcher Object

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

The LogAxis class maps numeric values logarithmically between a minimum and maximum value along a chart axis. By default, it determines minimum, maximum, and interval values from the charting data to fit all of the chart elements on the screen. You can also explicitly set specific values for these properties. A LogAxis object cannot correctly render negative values, as Log10() of a negative number is undefined.

MXML 語法

隱藏 MXML 語法

The <mx:LogAxis> tag inherits all the properties of its parent classes and adds the following properties:

  <mx:LogAxis
    Properties
    interval="10"
    maximum="null"
    maximumLabelPrecision="null"
    minimum="null"
  />

檢視範例

相關 API 元素

mx.charts.chartClasses.IAxis

公用屬性

隱藏繼承公用屬性

顯示繼承公用屬性

	屬性		定義自
		autoAdjust : Boolean Specifies whether Flex rounds values.	NumericAxis
		baseAtZero : Boolean Specifies whether Flex tries to keep the minimum and maximum values rooted at zero.	NumericAxis
		baseline : Number [唯讀] The computed minimum value for the axis as long as this value is greater than 0.	NumericAxis
		chartDataProvider : Object [唯寫] The data provider assigned to the enclosing chart.	AxisBase
		computedMaximum : Number The computed maximum value represented by this axis.	NumericAxis
		computedMinimum : Number The computed minimum value represented by this axis.	NumericAxis
		constructor : Object 類別物件的參照或是特定物件實體的建構函數。	Object
		direction : String Determines the direction in which the axis is rendered.	NumericAxis
		displayName : String The name of the axis.	AxisBase
		interval : Number Specifies the multiplier label values along the axis.	LogAxis
		labelFunction : Function Called to format axis values for display as labels.	NumericAxis
		maximum : Number Specifies the maximum value for an axis label.	LogAxis
		maximumLabelPrecision : Number Specifies the maximum number of decimal places for representing fractional values on the labels generated by this axis.	LogAxis
		minimum : Number Specifies the minimum value for an axis label.	LogAxis
		minorTicks : Array [唯讀] An Array of minor tick marks generated to represent this axis.	NumericAxis
		padding : Number Specifies padding that Flex adds to the calculated minimum and maximum values for the axis when rendering the values on the screen.	NumericAxis
		parseFunction : Function Specify a parseFunction to customize how the values rendered by your chart are converted into numeric values.	NumericAxis
		title : String The text for the title displayed along the axis.	AxisBase
		unitSize : Number [唯讀] The size of one unit of data as represented by this axis.	AxisBase

保護屬性

隱藏繼承保護屬性

顯示繼承保護屬性

	屬性		定義自
		assignedMaximum : Number The explicitly assigned maximum value.	NumericAxis
		assignedMinimum : Number The explicitly assigned minimum value.	NumericAxis
		computedInterval : Number The computed interval represented by this axis.	NumericAxis
		dataDescriptions : Array [唯讀] An Array of DataDescription structures describing the data being represented by the chart.	NumericAxis
		labelCache : Array The most recent set of AxisLabel objects generated to represent this axis.	NumericAxis
		labelMaximum : Number The maximum value where a label should be placed.	NumericAxis
		labelMinimum : Number The minimum value where a label should be placed.	NumericAxis
		minorTickCache : Array The most recent set of minor tick marks generated to represent this axis.	NumericAxis
		requiredDescribedFields : uint [唯讀] The fields of the DescribeData structure that this axis is interested in.	NumericAxis
		ticks : Array [唯讀] An Array of tick marks for this axis.	NumericAxis

公用方法

隱藏繼承公用方法

顯示繼承公用方法

	方法		定義自
		LogAxis() Constructor.	LogAxis
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void 會在 EventDispatcher 物件註冊事件偵聽程式，以便讓偵聽程式收到事件的通知。	EventDispatcher
		dataChanged():void Triggers events that inform the range object when the chart data has changed.	AxisBase
		dispatchEvent(event:Event):Boolean 會將事件傳送到事件流程。	EventDispatcher
		filterCache(cache:Array, field:String, filteredField:String):void Filters a set of values of arbitrary type to a set of numbers that can be mapped.	NumericAxis
		formatForScreen(value:Object):String Formats values for display in DataTips.	NumericAxis
		getLabelEstimate():AxisLabelSet Determines the range to estimate what the axis labels should be.	NumericAxis
		getLabels(minimumAxisLength:Number):AxisLabelSet Gets the labels text that is rendered.	NumericAxis
		hasEventListener(type:String):Boolean 會檢查 EventDispatcher 物件是否有對特定的事件類型註冊偵聽程式。	EventDispatcher
		hasOwnProperty(name:String):Boolean 指出物件是否有已定義的指定屬性。	Object
		invertTransform(value:Number):Object Maps a position along the axis back to a numeric data value.	NumericAxis
		isPrototypeOf(theClass:Object):Boolean 指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。	Object
		mapCache(cache:Array, field:String, convertedField:String, indexValues:Boolean = false):void Converts a set of values of arbitrary type to a set of numbers that can be transformed into screen coordinates.	NumericAxis
		preferDropLabels():Boolean Determines how the axis handles overlapping labels.	NumericAxis
		propertyIsEnumerable(name:String):Boolean 指出指定的屬性是否存在，以及是否可列舉。	Object
		reduceLabels(intervalStart:AxisLabel, intervalEnd:AxisLabel):AxisLabelSet Invoked when an AxisRenderer is unable to cleanly render the labels without overlap, and would like the Axis object to reduce the set of labels.	NumericAxis
		registerDataTransform(transform:mx.charts.chartClasses:DataTransform, dimensionName:String):void Each DataTransform that makes use of an axis registers itself with that axis.	AxisBase
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void 會從 EventDispatcher 物件移除偵聽程式。	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void 為迴圈作業設定動態屬性的可用性。	Object
		toLocaleString():String 傳回代表此物件的字串，根據地區特定慣例進行格式化。	Object
		toString():String 會傳回指定之物件的字串形式。	Object
		transformCache(cache:Array, field:String, convertedField:String):void Maps a set of values from data space to screen space.	NumericAxis
		unregisterDataTransform(transform:mx.charts.chartClasses:DataTransform):void Each DataTransform that makes use of an axis registers itself with that axis.	AxisBase
		update():void Updates the chart.	NumericAxis
		valueOf():Object 會傳回指定之物件的基本值。	Object
		willTrigger(type:String):Boolean 檢查此 EventDispatcher 物件是否已註冊事件偵聽程式，或者此物件的任何祖系已為特定事件類型註冊事件偵聽程式。	EventDispatcher

保護方法

隱藏繼承保護方法

顯示繼承保護方法

	方法		定義自
		adjustMinMax(minValue:Number, maxValue:Number):void Adjusts the generated or assigned range of the axis's labels.	NumericAxis
		buildLabelCache():Boolean Populates the labelCache property with labels representing the current values of the axis.	NumericAxis
		buildMinorTickCache():Array Builds an Array of positions for the minor tick marks Array that is generated by this axis.	NumericAxis
		describeData(requiredFields:uint):Array Called by the governing DataTransform to obtain a description of the data represented by this IChartElement.	AxisBase
		guardMinMax(min:Number, max:Number):Array Protects the range against invalid values for this axis type.	NumericAxis
		invalidateCache():void Invalidates the cached labels and tick marks that represent this axis's values.	NumericAxis

事件

按一下以瞭解事件的詳細資訊

隱藏繼承事件

顯示繼承事件

	事件		摘要	定義自
		activate	[廣播事件] 當 Flash Player 或 AIR 應用程式取得作業系統焦點並成為作用中時傳送。	EventDispatcher
		deactivate	[廣播事件] 當 Flash Player 或 AIR 應用程式失去作業系統焦點並成為非作用中時傳送。	EventDispatcher

屬性詳細資訊

interval

屬性

interval:Number

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Specifies the multiplier label values along the axis. A value of 10 generates labels at 1, 10, 100, 1000, etc., while a value of 100 generates labels at 1, 100, 10000, etc. Flex calculates the interval if this property is set to NaN. Intervals must be even powers of 10, and must be greater than or equal to 10. The LogAxis rounds the interval down to an even power of 10, if necessary.

預設值為 10。

實作
public function get interval():Number
public function set interval(value:Number):void

maximum

屬性

maximum:Number

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Specifies the maximum value for an axis label. If NaN, Flex determines the maximum value from the data in the chart. The maximum value must be an even power of 10. The LogAxis rounds an explicit maximum value up to an even power of 10, if necessary.

預設值為 NaN。

實作
public function get maximum():Number
public function set maximum(value:Number):void

maximumLabelPrecision

屬性

maximumLabelPrecision:Number

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Specifies the maximum number of decimal places for representing fractional values on the labels generated by this axis. By default, the Axis autogenerates this value from the labels themselves. A value of 0 round to the nearest integer value, while a value of 2 rounds to the nearest 1/100th of a value.

實作
public function get maximumLabelPrecision():Number
public function set maximumLabelPrecision(value:Number):void

minimum

屬性

minimum:Number

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Specifies the minimum value for an axis label. If NaN, Flex determines the minimum value from the data in the chart. The minimum value must be an even power of 10. The LogAxis will round an explicit minimum value downward to an even power of 10 if necessary.

預設值為 NaN。

實作
public function get minimum():Number
public function set minimum(value:Number):void

建構函式詳細資料

()

建構函式

public function LogAxis()

語言版本:

ActionScript 3.0

產品版本:

Flex 3

執行階段版本:

Flash Player 9, AIR 1.1

Constructor.

範例如何使用本範例

LogAxisExample.mxml

<?xml version="1.0"?>
<!-- Simple example to demonstrate the LogAxis class. -->
<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">

    <fx:Script>
        <![CDATA[

        import mx.collections.ArrayCollection;

        [Bindable]
        private var expensesAC:ArrayCollection = new ArrayCollection( [
            { Month: "Jan", Profit: 20000, Expenses: 1500, Amount: 450 },
            { Month: "Feb", Profit: 1000, Expenses: 15000, Amount: 600 },
            { Month: "Mar", Profit: 15000, Expenses: 5000, Amount: 300 },
            { Month: "Apr", Profit: 1800, Expenses: 1200, Amount: 900 },
            { Month: "May", Profit: 2400, Expenses: 575, Amount: 500 } ]);
        ]]>
    </fx:Script>

    <mx:Panel title="LogAxis Example" height="100%" width="100%">

        <mx:LineChart id="linechart" height="100%" width="100%"
            paddingLeft="5" paddingRight="5" 
            showDataTips="true" dataProvider="{expensesAC}">
                
            <mx:horizontalAxis>
                <mx:CategoryAxis categoryField="Month"/>
            </mx:horizontalAxis>
                
            <mx:verticalAxis>
                <mx:LogAxis interval="10"/>
            </mx:verticalAxis>
                
            <mx:series>
                <mx:LineSeries yField="Profit" form="curve" displayName="Profit"/>
                <mx:LineSeries yField="Expenses" form="curve" displayName="Expenses"/>
                <mx:LineSeries yField="Amount" form="curve" displayName="Amount"/>
            </mx:series>
        </mx:LineChart>

        <mx:Legend dataProvider="{linechart}"/>

    </mx:Panel>
</s:Application>

法律聲明 | 線上隱私權政策

LogAxis - AS3 Flex

類別 x

interval

maximum

maximumLabelPrecision

minimum

LogAxis