Adobe® Flex® 4 Language Reference
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mx.graphics 
ImageSnapshot 
Packagemx.graphics
Classpublic dynamic class ImageSnapshot
InheritanceImageSnapshot Inheritance 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
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
  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
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
  width : int
The image width in pixels.
ImageSnapshot
Public Methods
 MethodDefined By
  
ImageSnapshot(width:int = 0, height:int = 0, data:ByteArray = null, contentType:String = null)
Constructor.
ImageSnapshot
  
captureBitmapData(source:IBitmapDrawable, matrix:Matrix = null, colorTransform:flash.geom: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
  
[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
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Public Constants
 ConstantDefined 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:flash.geom: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:flash.geom: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.

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

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.