| 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 |
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.
Ocultar propriedades públicas herdadas
Mostrar propriedades públicas herdadas| 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 | ||
| Método | Definido por | ||
|---|---|---|---|
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 | |
Informs the DataTransform that some of the underlying data
being represented on the chart has changed. | DataTransform | ||
Collects important displayed values for all elements
associated with this data transform. | DataTransform | ||
|
Envia um evento para o fluxo de eventos. | EventDispatcher | |
Retrieves the axis instance responsible for transforming
the data dimension specified by the dimension parameter. | DataTransform | ||
|
Verifica se o objeto EventDispatcher tem ouvintes registrados para um tipo específico de evento. | EventDispatcher | |
|
Indica se um objeto tem uma propriedade especificada definida. | Object | |
Transforms x and y coordinates relative to the DataTransform
coordinate system into a two-dimensional value in data space. | DataTransform | ||
|
Indica se uma ocorrência da classe Object está na cadeia de protótipos do objeto especificado como o parâmetro. | Object | |
|
Indica se a propriedade especificada existe e é enumerável. | Object | |
|
Remove um ouvinte do objeto EventDispatcher. | EventDispatcher | |
Assigns an axis instance to a particular dimension of the transform. | DataTransform | ||
|
Define a disponibilidade de uma propriedade dinâmica para operações de repetição. | Object | |
|
Retorna a representação da string deste objeto, formatado segundo as convenções específicas para a localidade. | Object | |
|
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 | ||
|
Retorna o valor primitivo do objeto especificado. | Object | |
|
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 | |
| Evento | Resumo | Definido por | ||
|---|---|---|---|---|
| [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 | ||
| [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 | ||
| 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 | |||
axes | propriedade |
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):voidDataTransform | () | 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.
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.
|
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.
|
IAxis — The axis instance.
|
Elementos da API relacionados
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).
|
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.
|
transformChange | Evento |
mx.events.FlexEventpropriedade 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.
TheFlexEvent.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. |
Wed Jun 13 2018, 11:10 AM Z