| Pacchetto | mx.charts.chartClasses |
| Classe | public class DataTransform |
| Ereditarietà | DataTransform  EventDispatcher Object |
| Sottoclassi | CartesianTransform, PolarTransform |
| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Nascondi proprietà pubbliche ereditate
Mostra proprietà pubbliche ereditate| Proprietà | Definito da | ||
|---|---|---|---|
| axes : Object [sola lettura]
The set of axes associated with this transform. | DataTransform | ||
 | constructor : Object
Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto. | Object | |
| elements : Array
The elements that are associated with this transform. | DataTransform | ||
| Metodo | Definito da | ||
|---|---|---|---|
Constructor. | DataTransform | ||
| addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registra un oggetto listener di eventi con un oggetto EventDispatcher, in modo che il listener riceva la notifica di un 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 | ||
|
Invia un evento nel flusso di eventi. | EventDispatcher | |
Retrieves the axis instance responsible for transforming
the data dimension specified by the dimension parameter. | DataTransform | ||
|
Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento. | EventDispatcher | |
|
Indica se per un oggetto è definita una proprietà specifica. | Object | |
Transforms x and y coordinates relative to the DataTransform
coordinate system into a two-dimensional value in data space. | DataTransform | ||
|
Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro. | Object | |
|
Indica se la proprietà specificata esiste ed è enumerabile. | Object | |
|
Rimuove un listener dall'oggetto EventDispatcher. | EventDispatcher | |
Assigns an axis instance to a particular dimension of the transform. | DataTransform | ||
|
Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche. | Object | |
|
Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate. | Object | |
|
Restituisce la rappresentazione in formato stringa dell'oggetto specificato. | 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 | ||
|
Restituisce il valore di base dell'oggetto specificato. | Object | |
|
Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato. | EventDispatcher | |
| Evento | Riepilogo | Definito da | ||
|---|---|---|---|---|
| [evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR ottiene lo stato di attivazione del sistema operativo ed entra nello stato attivo. | EventDispatcher | ||
| [evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR perde l'attivazione del sistema operativo e sta entrando nello stato inattivo. | 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 | proprietà |
elements | proprietà |
elements:Array| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Implementazione
public function get elements():Array public function set elements(value:Array):voidDataTransform | () | Funzione di costruzione |
public function DataTransform()| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni runtime: | Flash Player 9, AIR 1.1 |
Constructor.
dataChanged | () | metodo |
public function dataChanged():void| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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 | () | metodo |
public function describeData(dimension:String, requiredFields:uint):Array| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Parametri
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 | () | metodo |
public function getAxis(dimension:String):IAxis| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Parametri
dimension:String — The dimension whose axis is responsible
for transforming the data.
|
IAxis — The axis instance.
|
Elementi API correlati
invertTransform | () | metodo |
public function invertTransform(... values):Array| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Parametri
... values — The x and y positions (in that order).
|
Array — An Array containing the transformed values.
|
setAxis | () | metodo |
public function setAxis(dimension:String, v:IAxis):void| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Parametri
dimension:String — The dimension of the transform.
| |
v:IAxis — The target axis instance.
|
transformCache | () | metodo |
public function transformCache(cache:Array, xField:String, xConvertedField:String, yField:String, yConvertedField:String):void| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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.
Parametri
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.FlexEventproprietà FlexEvent.type =
mx.events.FlexEvent.TRANSFORM_CHANGE| Versione linguaggio: | ActionScript 3.0 |
| Versione prodotto: | Flex 3 |
| Versioni 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. |
Tue Jun 12 2018, 02:44 PM Z