| Paket | mx.charts.chartClasses |
| Klass | public class DataTransform |
| Arv | DataTransform  EventDispatcher Object |
| Underklasser | CartesianTransform, PolarTransform |
| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Dölj ärvda publika egenskaper
Visa ärvda publika egenskaper| Egenskap | Definieras med | ||
|---|---|---|---|
| axes : Object [skrivskyddad]
The set of axes associated with this transform. | DataTransform | ||
 | constructor : Object
En referens till klassobjektet eller konstruktorfunktionen för en given objektinstans. | Object | |
| elements : Array
The elements that are associated with this transform. | DataTransform | ||
| Metod | Definieras med | ||
|---|---|---|---|
Constructor. | DataTransform | ||
| addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registrerar ett händelseavlyssnarobjekt för ett EventDispatcher-objekt så att avlyssnaren får meddelanden om händelser. | 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 | ||
|
Skickar en händelse till händelseflödet. | EventDispatcher | |
Retrieves the axis instance responsible for transforming
the data dimension specified by the dimension parameter. | DataTransform | ||
|
Kontrollerar om EventDispatcher-objektet har några avlyssnare registrerade för en viss typ av händelse. | EventDispatcher | |
|
Anger om det finns en egenskap angiven för ett objekt. | Object | |
Transforms x and y coordinates relative to the DataTransform
coordinate system into a two-dimensional value in data space. | DataTransform | ||
|
Anger om en instans av klassen Object finns i prototypkedjan för objektet som anges som parameter. | Object | |
|
Anger om den angivna egenskapen finns och är uppräkningsbar. | Object | |
|
Tar bort en avlyssnare från EventDispatcher-objektet. | EventDispatcher | |
Assigns an axis instance to a particular dimension of the transform. | DataTransform | ||
|
Anger tillgänglighet för en dynamisk egenskap för slingåtgärder. | Object | |
|
Returnerar det här objektets strängrepresentation, formaterad i enlighet med språkspecifika konventioner. | Object | |
|
Returnerar det angivna objektets strängbeteckning. | 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 | ||
|
Returnerar det angivna objektets primitiva värde. | Object | |
|
Kontrollerar om en händelseavlyssnare är registrerad för det här EventDispatcher-objektet eller något av dess överordnade objekt för den angivna händelsetypen. | EventDispatcher | |
| Händelse | Sammanfattning | Definieras med | ||
|---|---|---|---|---|
| [utsändningshändelse] Skickas när Flash Player eller AIR får operativsystemfokus och blir aktivt. | EventDispatcher | ||
| [utsändningshändelse] Skickas när Flash Player eller AIR förlorar operativsystemfokus och blir inaktivt. | 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 | egenskap |
elements | egenskap |
elements:Array| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Implementering
public function get elements():Array public function set elements(value:Array):voidDataTransform | () | Konstruktor |
public function DataTransform()| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | Flash Player 9, AIR 1.1 |
Constructor.
dataChanged | () | metod |
public function dataChanged():void| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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 | () | metod |
public function describeData(dimension:String, requiredFields:uint):Array| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Parametrar
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 | () | metod |
public function getAxis(dimension:String):IAxis| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Parametrar
dimension:String — The dimension whose axis is responsible
for transforming the data.
|
IAxis — The axis instance.
|
Relaterade API-element
invertTransform | () | metod |
public function invertTransform(... values):Array| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Parametrar
... values — The x and y positions (in that order).
|
Array — An Array containing the transformed values.
|
setAxis | () | metod |
public function setAxis(dimension:String, v:IAxis):void| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Parametrar
dimension:String — The dimension of the transform.
| |
v:IAxis — The target axis instance.
|
transformCache | () | metod |
public function transformCache(cache:Array, xField:String, xConvertedField:String, yField:String, yConvertedField:String):void| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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.
Parametrar
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 | Händelse |
mx.events.FlexEventegenskap FlexEvent.type =
mx.events.FlexEvent.TRANSFORM_CHANGE| Språkversion: | ActionScript 3.0 |
| Produktversion: | Flex 3 |
| Körningsmiljöversioner: | 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, 01:40 PM Z