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ImageSnapshot

Package | mx.graphics
Class | public dynamic class ImageSnapshot
Inheritance | ImageSnapshot Object

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A helper class used to capture a snapshot of any Flash component that implements `flash.display.IBitmapDrawable`, including Flex UIComponents.

An instance of this class can be sent as a RemoteObject to Adobe's LiveCycle Data Services to generate a PDF file of a client-side image. If you need to specify additional properties of the image beyond its `contentType`, `width`, and `height` properties, you should set name/value pairs on the `properties` object.

In earlier versions of Flex, you set these additional properties on the ImageSnapshot instance itself. This class is still dynamic in order to allow that, but in a future version of Flex it might no longer be dynamic.

Public Properties

| Property | Defined By
--- | --- | ---
|  | contentType : String The MIME content type for the image encoding format that was used to capture this snapshot. | ImageSnapshot
|  | data : ByteArray The encoded data representing the image snapshot. | ImageSnapshot
|  | defaultEncoder : Class [static] The default mx.graphics.codec.IImageEncoder implementation used to capture images. | ImageSnapshot
|  | height : int The image height in pixels. | ImageSnapshot
|  | properties : Object An Object containing name/value pairs specifying additional properties of the image. | ImageSnapshot
|  | width : int The image width in pixels. | ImageSnapshot

Public Methods

| Method | Defined By
--- | --- | ---
|  | ImageSnapshot(width:int = 0, height:int = 0, data:ByteArray = null, contentType:String = null) Constructor. | ImageSnapshot
|  | captureBitmapData(source:IBitmapDrawable, matrix:Matrix = null, colorTransform:ColorTransform = null, blendMode:String = null, clipRect:Rectangle = null, smoothing:Boolean = false):BitmapData [static] A utility method to grab a raw snapshot of a UI component as BitmapData. | ImageSnapshot
|  | captureImage(source:IBitmapDrawable, dpi:Number = 0, encoder:IImageEncoder = null, scaleLimited:Boolean = true):ImageSnapshot [static] A utility method to grab a snapshot of a component, scaled to a specific resolution (in dpi) and encoded into a specific image format. | ImageSnapshot
|  | encodeImageAsBase64(snapshot:ImageSnapshot):String [static] A utility method to convert an ImageSnapshot into a Base-64 encoded String for transmission in text based serialization formats such as XML. | ImageSnapshot

Public Constants

| Constant | Defined By
--- | --- | ---
|  | MAX_BITMAP_DIMENSION : int = 2880 [static] The maximum width and height of a Bitmap. | ImageSnapshot

Property Detail

contentType | property

`contentType:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The MIME content type for the image encoding format that was used to capture this snapshot. For PNG format images, the MIME type is "image/png". For JPG or JPEG images, the MIME type is "image/jpeg"

Implementation
`public function get contentType():String`
`public function set contentType(value:String):void`

data | property |

`data:ByteArray`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The encoded data representing the image snapshot.

Implementation
`public function get data():ByteArray`
`public function set data(value:ByteArray):void`

defaultEncoder | property |

`public static var defaultEncoder:Class`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The default `mx.graphics.codec.IImageEncoder` implementation used to capture images. The two implementations are PNGEncoder and JPEGEncoder. The default encoder uses the PNG format.

height | property |

`height:int`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The image height in pixels.

Implementation
`public function get height():int`
`public function set height(value:int):void`

properties | property |

`properties:Object`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

An Object containing name/value pairs specifying additional properties of the image.

You generally supply such information only when sending an ImageSnapshot instance to Adobe's LiveCycle Data Services in order to generate a PDF file. You can either set the entire object or set individual name/value pairs on the pre-existing empty Object.

The default value is `{}`.

Implementation
`public function get properties():Object`
`public function set properties(value:Object):void`

width | property |

`width:int`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The image width in pixels.

Implementation
`public function get width():int`
`public function set width(value:int):void`
Constructor Detail

ImageSnapshot | () | Constructor

`public function ImageSnapshot(width:int = 0, height:int = 0, data:ByteArray = null, contentType:String = null)`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

Constructor.

Parameters

| `width:int` (default = `0`)`` — Width of the image.
| `height:int` (default = `0`)`` — Height of the image.
| `data:ByteArray` (default = `null`)`` — A byte array to contain the image.
| `contentType:String` (default = `null`)`` — The encoder format type for the image, either PNGEncoder or JPEGEncoder.

Method Detail

captureBitmapData | () | method

`public static function captureBitmapData(source:IBitmapDrawable, matrix:Matrix = null, colorTransform:ColorTransform = null, blendMode:String = null, clipRect:Rectangle = null, smoothing:Boolean = false):BitmapData`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A utility method to grab a raw snapshot of a UI component as BitmapData.

Parameters

| `source:IBitmapDrawable` — An object that implements the `flash.display.IBitmapDrawable` interface.
| `matrix:Matrix` (default = `null`)`` — A Matrix object used to scale, rotate, or translate the coordinates of the captured bitmap. If you do not want to apply a matrix transformation to the image, set this parameter to an identity matrix, created with the default new Matrix() constructor, or pass a null value.
| `colorTransform:ColorTransform` (default = `null`)`` — A ColorTransform object that you use to adjust the color values of the bitmap. If no object is supplied, the bitmap image's colors are not transformed. If you must pass this parameter but you do not want to transform the image, set this parameter to a ColorTransform object created with the default new ColorTransform() constructor.
| `blendMode:String` (default = `null`)`` — A string value, from the flash.display.BlendMode class, specifying the blend mode to be applied to the resulting bitmap.
| `clipRect:Rectangle` (default = `null`)`` — A Rectangle object that defines the area of the source object to draw. If you do not supply this value, no clipping occurs and the entire source object is drawn.
| `smoothing:Boolean` (default = `false`)`` — A Boolean value that determines whether a BitmapData object is smoothed when scaled.

Returns

| `BitmapData` — A BitmapData object representing the captured snapshot or null if the source has no visible bounds.

captureImage | () | method |

`public static function captureImage(source:IBitmapDrawable, dpi:Number = 0, encoder:IImageEncoder = null, scaleLimited:Boolean = true):ImageSnapshot`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A utility method to grab a snapshot of a component, scaled to a specific resolution (in dpi) and encoded into a specific image format.

Parameters

| `source:IBitmapDrawable` — An object that implements the `flash.display.IBitmapDrawable` interface.
| `dpi:Number` (default = `0`)`` — The resolution in dots per inch. If a resolution is not provided, the current on-screen resolution is used by default.
| `encoder:IImageEncoder` (default = `null`)`` — The image format used to encode the raw bitmap. The two encoders are PNGEncoder and JPEGEncoder. If an encoder is not provided, the default is PNGEncoder.
| `scaleLimited:Boolean` (default = `true`)`` — The maximum width or height of a bitmap in Flash is 2880 pixels - if scaleLimited is set to true the resolution will be reduced proportionately to fit within 2880 pixels, otherwise, if scaleLimited is false, smaller snapshot windows will be taken and stitched together to capture a larger image. The default is true.

Returns

| `ImageSnapshot` — An ImageSnapshot holding an encoded captured snapshot and associated image metadata.

encodeImageAsBase64 | () | method |

`public static function encodeImageAsBase64(snapshot:ImageSnapshot):String`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

A utility method to convert an ImageSnapshot into a Base-64 encoded String for transmission in text based serialization formats such as XML.

Parameters

| `snapshot:ImageSnapshot` — An image captured as an `mx.graphics.ImageSnapshot`.

Returns

| `String` — A string representing the base64 encoded snapshot.

See also

captureImage
Constant Detail

MAX_BITMAP_DIMENSION | Constant

`public static const MAX_BITMAP_DIMENSION:int = 2880`

Language Version : | ActionScript 3.0

Product Version : | Flex 3

Runtime Versions : | Flash Player 9, AIR 1.1

The maximum width and height of a Bitmap.

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