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PolarTransform

Package | mx.charts.chartClasses
Class | public class PolarTransform
Inheritance | PolarTransform DataTransform flash.events.EventDispatcher

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The PolarTransform object represents a set of axes used to map data values to angle/distance polar coordinates and vice versa.

You typically do not need to interact with the PolarTransform object. Transforms are created automatically by the built-in chart types and are used by the series contained within to transform data into rendering coordinates.

Public Properties
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| Property | Defined By
--- | --- | ---
|  | axes : Object [read-only] The set of axes associated with this transform. | DataTransform
|  | elements : Array The elements that are associated with this transform. | DataTransform
|  | origin : Point [read-only] The origin of the polar transform. | PolarTransform
|  | radius : Number [read-only] The radius used by the transform to convert data units to polar coordinates. | PolarTransform

Public Methods
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| Method | Defined By
--- | --- | ---
|  | PolarTransform() Constructor. | PolarTransform
|  | 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
|  | getAxis(dimension:String):IAxis Retrieves the axis instance responsible for transforming the data dimension specified by the dimension parameter. | DataTransform
|  | invertTransform(... values):Array Transforms x and y coordinates relative to the DataTransform coordinate system into a two-dimensional value in data space. | DataTransform
|  | setAxis(dimension:String, v:IAxis):void Assigns an axis instance to a particular dimension of the transform. | DataTransform
|  | setSize(width:Number, height:Number):void Sets the width and height that the PolarTransform uses when calculating origin and radius. | PolarTransform
|  | transformCache(cache:Array, aField:String, aConvertedField:String, rField:String, rConvertedField:String):void [override] Maps a set of numeric values representing data to screen coordinates. | PolarTransform

Events
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| Event | Summary | Defined By
--- | --- | --- | ---
|  | 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
--- | --- | ---
|  | ANGULAR_AXIS : String = a [static] A string representing the angular axis. | PolarTransform
|  | RADIAL_AXIS : String = r [static] A string representing the radial axis. | PolarTransform

Property Detail

origin | property

`origin:Point` [read-only]

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The origin of the polar transform. This point is used by associated series to convert data units to screen coordinates.

Implementation
`public function get origin():Point`

radius | property |

`radius:Number` [read-only]

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The radius used by the transform to convert data units to polar coordinates.

Implementation
`public function get radius():Number`
Constructor Detail

PolarTransform | () | Constructor

`public function PolarTransform()`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Constructor.

Method Detail

setSize | () | method

`public function setSize(width:Number, height:Number):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Sets the width and height that the PolarTransform uses when calculating origin and radius. The containing chart calls this method. You should not generally call this method directly.

Parameters

| `width:Number` — The width, in pixels, of the PolarTransform.
| `height:Number` — The height, in pixels, of the PolarTransform.

transformCache | () | method |

`override public function transformCache(cache:Array, aField:String, aConvertedField:String, rField:String, rConvertedField: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 will store the converted numeric values.
| `aField:String` — The field where the data values for the x axis can be found.
| `aConvertedField:String` — The field where the mapped x screen coordinate will be stored.
| `rField:String` — The field where the data values for the y axis can be found.
| `rConvertedField:String` — The field where the mapped y screen coordinate will be stored.

Constant Detail

ANGULAR_AXIS | Constant

`public static const ANGULAR_AXIS:String = a`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A string representing the angular axis.

RADIAL_AXIS | Constant |

`public static const RADIAL_AXIS:String = r`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A string representing the radial axis.

Sun Mar 5 2017, 03:42 PM +11:00