DataTransform

Pacote	mx.charts.chartClasses
Classe	public class DataTransform
Herança	DataTransform EventDispatcher Object
Subclasses	CartesianTransform, PolarTransform

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

The DataTransform object represents a portion of a chart that contains glyphs and can transform values to screen coordinates and vice versa. Each DataTransform object has a horizontal axis, a vertical axis, and a set of glyphs (background, data, and overlay) to render.

In theory, a chart can contain multiple overlaid DataTransform objects. This allows you to display a chart with multiple data sets rendered in the same area but with different ranges. For example, you might want to show monthly revenues compared to the number of units sold. If revenue was typically in millions while units was typically in the thousands, it would be difficult to render these effectively along the same range. Overlaying them in different DataTransform objects allows the end user to compare trends in the values when they are rendered with different ranges.

Charts can only contain one set of DataTransform.

Most of the time, you will use the ChartBase object, which hides the existance of the DataTransform object between the chart and its contained glyphs and axis objects. If you create your own ChartElement objects, you must understand the methods of the DataTransform class to correctly implement their element.

Propriedades públicas

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	Propriedade		Definido por
		axes : Object [somente leitura] The set of axes associated with this transform.	DataTransform
		constructor : Object Uma referência ao objeto de classe ou à função de construtor de uma determinada ocorrência de objeto.	Object
		elements : Array The elements that are associated with this transform.	DataTransform

Métodos públicos

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	Método		Definido por
		DataTransform() Constructor.	DataTransform
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registra um objeto de ouvinte de evento em um objeto EventDispatcher, de forma que o ouvinte receba a notificação de um evento.	EventDispatcher
		dataChanged():void Informs the DataTransform that some of the underlying data being represented on the chart has changed.	DataTransform
		describeData(dimension:String, requiredFields:uint):Array Collects important displayed values for all elements associated with this data transform.	DataTransform
		dispatchEvent(event:Event):Boolean Envia um evento para o fluxo de eventos.	EventDispatcher
		getAxis(dimension:String):IAxis Retrieves the axis instance responsible for transforming the data dimension specified by the dimension parameter.	DataTransform
		hasEventListener(type:String):Boolean Verifica se o objeto EventDispatcher tem ouvintes registrados para um tipo específico de evento.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indica se um objeto tem uma propriedade especificada definida.	Object
		invertTransform(... values):Array Transforms x and y coordinates relative to the DataTransform coordinate system into a two-dimensional value in data space.	DataTransform
		isPrototypeOf(theClass:Object):Boolean Indica se uma ocorrência da classe Object está na cadeia de protótipos do objeto especificado como o parâmetro.	Object
		propertyIsEnumerable(name:String):Boolean Indica se a propriedade especificada existe e é enumerável.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Remove um ouvinte do objeto EventDispatcher.	EventDispatcher
		setAxis(dimension:String, v:IAxis):void Assigns an axis instance to a particular dimension of the transform.	DataTransform
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Define a disponibilidade de uma propriedade dinâmica para operações de repetição.	Object
		toLocaleString():String Retorna a representação da string deste objeto, formatado segundo as convenções específicas para a localidade.	Object
		toString():String Retorna a representação de string do objeto especificado.	Object
		transformCache(cache:Array, xField:String, xConvertedField:String, yField:String, yConvertedField:String):void Maps a set of numeric values representing data to screen coordinates.	DataTransform
		valueOf():Object Retorna o valor primitivo do objeto especificado.	Object
		willTrigger(type:String):Boolean Verifica se um ouvinte de evento está registrado nesse objeto EventDispatcher ou em qualquer um de seus ancestrais para o tipo de evento especificado.	EventDispatcher

Eventos

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	Resumo	Definido por
activate	[transmissão de evento] Despachado quando o Flash Player ou o aplicativo do AIR ganha o foco do sistema operacional e está se tornando inativo.	EventDispatcher
deactivate	[transmissão de evento] Despachado quando o Flash Player ou o aplicativo do AIR perde o foco do sistema operacional e está se tornando inativo.	EventDispatcher
transformChange	Dispatched when the transformation from data space to screen space has changed, typically either because the axes that make up the transformation have changed in some way, or the data transform itself has size.	DataTransform

Detalhes da propriedade

axes	propriedade

axes:Object [somente leitura]

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

The set of axes associated with this transform.

Implementação
public function get axes():Object

elements

propriedade

elements:Array

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

The elements that are associated with this transform. This Array includes background, series, and overlay elements associated with the transform. This value is assigned by the enclosing chart object.

Implementação
public function get elements():Array
public function set elements(value:Array):void

Detalhes do construtor

()

Construtor

public function DataTransform()

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Constructor.

Detalhes do método

dataChanged

()

método

public function dataChanged():void

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Informs the DataTransform that some of the underlying data being represented on the chart has changed. The DataTransform generally has no knowledge of the source of the underlying data being represented by the chart, so glyphs should call this when their data changes so that the DataTransform can recalculate range scales based on their data. This does not invalidate the DataTransform, because there is no guarantee the data has changed. The axis objects (or range objects) must trigger an invalidate event.

describeData

()

método

public function describeData(dimension:String, requiredFields:uint):Array

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Collects important displayed values for all elements associated with this data transform. Axis instances call this method to collect the values they need to consider when auto-generating appropriate ranges. This method returns an Array of BoundedValue objects.

To collect important values for the horizontal axis of a CartesianTransform, pass 0. To collect values for the vertical axis, pass 1.

Parâmetros

	`dimension:String` — The dimension to collect values for.

	`requiredFields:uint` — Defines the data that are required by this transform.

Retorna

Array — A Array of BoundedValue objects.

getAxis

()

método

public function getAxis(dimension:String):IAxis

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Retrieves the axis instance responsible for transforming the data dimension specified by the dimension parameter. If no axis has been previously assigned, a default axis is created. The default axis for all dimensions is a LinearAxis with the autoAdjust property set to false.

Parâmetros

dimension:String — The dimension whose axis is responsible for transforming the data.

Retorna

IAxis — The axis instance.

Elementos da API relacionados

mx.charts.LinearAxis

invertTransform

()

método

public function invertTransform(... values):Array

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Transforms x and y coordinates relative to the DataTransform coordinate system into a two-dimensional value in data space.

Parâmetros

... values — The x and y positions (in that order).

Retorna

Array — An Array containing the transformed values.

setAxis

()

método

public function setAxis(dimension:String, v:IAxis):void

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Assigns an axis instance to a particular dimension of the transform. Axis objects are assigned by the enclosing chart object.

Parâmetros

	`dimension:String` — The dimension of the transform.

	`v:IAxis` — The target axis instance.

transformCache

()

método

 public function transformCache(cache:Array, xField:String, xConvertedField:String, yField:String, yConvertedField:String):void

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Maps a set of numeric values representing data to screen coordinates. This method assumes the values are all numbers, so any non-numeric values must have been previously converted with the mapCache() method.

Parâmetros

	`cache:Array` — An array of objects containing the data values in their fields. This is also where this function will store the converted numeric values.

	`xField:String` — The field where the data values for the x axis can be found.

	`xConvertedField:String` — The field where the mapped x screen coordinate will be stored.

	`yField:String` — The field where the data values for the y axis can be found.

	`yConvertedField:String` — The field where the mapped y screen coordinate will be stored.

Detalhe do evento

transformChange

Evento

Tipo do objeto de evento: mx.events.FlexEvent
propriedade FlexEvent.type = mx.events.FlexEvent.TRANSFORM_CHANGE

Versão da linguagem:

ActionScript 3.0

Versão de produto:

Flex 3

Versões de runtime:

Flash Player 9, AIR 1.1

Dispatched when the transformation from data space to screen space has changed, typically either because the axes that make up the transformation have changed in some way, or the data transform itself has size.

The FlexEvent.TRANSFORM_CHANGE constant defines the value of the type property of the event object for a transformChange event.

The properties of the event object have the following values:

Property	Value
`bubbles`	false
`cancelable`	false
`currentTarget`	The Object that defines the event listener that handles the event. For example, if you use `myButton.addEventListener()` to register an event listener, myButton is the value of the `currentTarget`.
`target`	The Object that dispatched the event; it is not always the Object listening for the event. Use the `currentTarget` property to always access the Object listening for the event.

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DataTransform - AS3 Flex

Classes x

axes

elements

DataTransform

dataChanged

describeData

getAxis

invertTransform

setAxis

transformCache

transformChange