mx.charts.chartClasses.CartesianTransform - Adobe® Flex® 4 Language Reference (Flex 4)

Package	mx.charts.chartClasses
Class	public class CartesianTransform
Inheritance	CartesianTransform DataTransform EventDispatcher Object

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The CartesianTransform object represents a set of axes that maps data values to x/y Cartesian screen coordinates and vice versa.

When using charts in your applications, you typically will not need to interact with the CartesianTransform object. Transforms are created automatically by the built-in chart types and used by the series contained within so that they can transform data into rendering coordinates.

Public Properties

Hide Inherited Public Properties

Show Inherited Public Properties

	Property		Defined By
		axes : Object [read-only] The set of axes associated with this transform.	DataTransform
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		elements : Array The elements that are associated with this transform.	DataTransform
		pixelHeight : Number [write-only] The height of the data area that the CartesianTransform represents, in pixels.	CartesianTransform
		pixelWidth : Number [write-only] The width of the data area that the CartesianTransform represents, in pixels.	CartesianTransform
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object

Public Methods

Hide Inherited Public Methods

Show Inherited Public Methods

	Method		Defined By
		CartesianTransform() Constructor.	CartesianTransform
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.	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 Dispatches an event into the event flow.	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 Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		invertTransform(... values):Array [override] Transforms x and y coordinates relative to the DataTransform coordinate system into a 2-dimensional value in data space.	CartesianTransform
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	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 Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		transformCache(cache:Array, xField:String, xConvertedField:String, yField:String, yConvertedField:String):void [override] Maps a set of numeric values representing data to screen coordinates.	CartesianTransform
		valueOf():Object Returns the primitive value of the specified object.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	EventDispatcher

Events

Click for more information on events

Hide Inherited Events

Show Inherited Events

	Summary	Defined By
activate	[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.	EventDispatcher
deactivate	[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.	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

Public Constants

	Constant		Defined By
		HORIZONTAL_AXIS : String = "h" [static] A String representing the horizontal axis.	CartesianTransform
		VERTICAL_AXIS : String = "v" [static] A String representing the vertical axis.	CartesianTransform

Property Detail

pixelHeight

property

pixelHeight:Number [write-only]

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The height of the data area that the CartesianTransform represents, in pixels. The containing chart sets this property explicitly during layout. The CartesianTransform uses this property to map data values to screen coordinates.

Implementation
public function set pixelHeight(value:Number):void

pixelWidth

property

pixelWidth:Number [write-only]

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The width of the data area that the CartesianTransform represents, in pixels. The containing chart sets this property explicitly during layout. The CartesianTransform uses this property to map data values to screen coordinates.

Implementation
public function set pixelWidth(value:Number):void

Constructor Detail

CartesianTransform

()

Constructor

public function CartesianTransform()

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Constructor.

Method Detail

invertTransform

()

method

override public function invertTransform(... values):Array

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Transforms x and y coordinates relative to the DataTransform coordinate system into a 2-dimensional value in data space.

Parameters

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

Returns

Array — An Array containing the transformed values.

transformCache

()

method

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

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

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.

Parameters

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

	`xField:String` — The field where the data values for the x axis are stored.

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

	`yField:String` — The field where the data values for the y axis are stored.

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

Constant Detail

HORIZONTAL_AXIS

Constant

public static const HORIZONTAL_AXIS:String = "h"

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

A String representing the horizontal axis.

VERTICAL_AXIS

Constant

public static const VERTICAL_AXIS:String = "v"

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

A String representing the vertical axis.