Полезная информация

Java AWT

Previous Chapter 22
java.awt.image Reference
Next
 

PixelGrabber

Name

PixelGrabber

[Graphic: Figure from the text]

Description

The PixelGrabber class is an ImageConsumer that captures the pixels from an image and saves them in an array.

Class Definition

public class java.awt.image.PixelGrabber
    extends java.lang.Object 
    implements java.awt.image.ImageConsumer {
  // Constructors
  public PixelGrabber (Image img, int x, int y, int w, int h, 
      boolean forceRGB); (New)
  public PixelGrabber (Image image, int x, int y, int width, 
      int height, int[] pixels, int offset, int scansize);
  public PixelGrabber (ImageProducer ip, int x, int y, int width, 
      int height, int[] pixels, int offset, int scansize);
  // Instance Methods
  public synchronized void abortGrabbing(); (New)
  public synchronized ColorModel getColorModel(); (New)
  public synchronized int getHeight(); (New)
  public synchronized Object getPixels(); (New)
  public synchronized int getStatus(); (New)
  public synchronized int getWidth(); (New)
  public boolean grabPixels() throws InterruptedException;
  public synchronized boolean grabPixels (long ms) 
      throws InterruptedException;
  public synchronized void imageComplete (int status);
  public void setColorModel (ColorModel model);
  public void setDimensions (int width, int height);
  public void setHints (int hints);
  public void setPixels (int x, int y, int width, int height, 
      ColorModel model, byte[] pixels, int offset, int scansize);
  public void setPixels (int x, int y, int width, int height, 
      ColorModel model, int[] pixels, int offset, int scansize);
  public void setProperties (Hashtable properties);
  public synchronized void startGrabbing(); (New)
  public synchronized int status(); (Deprecated)
}

Constructors

PixelGrabber

public PixelGrabber (Image img, int x, int y, int w, int h, boolean forceRGB) (New)

Parameters

img

Image to use as source of pixel data.

x

x-coordinate of top-left corner of pixel data.

y

y-coordinate of top-left corner of pixel data.

w

Width of pixel data.

h

Height of pixel data.

forceRGB

true to force the use of the RGB color model; false otherwise.

Description

Constructs a PixelGrabber instance to grab the specified area of the image.

public PixelGrabber (Image image, int x, int y, int width, int height, int[] pixels, int offset, int scansize)

Parameters

image

Image to use as source of pixel data.

x

x-coordinate of top-left corner of pixel data.

y

y-coordinate of top-left corner of pixel data.

width

Width of pixel data.

height

Height of pixel data.

pixels

Where to store pixel data when grabPixels() called.

offset

Offset from beginning of each line in pixels array.

scansize

Size of each line of data in pixels array.

Description

Constructs a PixelGrabber instance to grab the specified area of the image and store the pixel data from this area in the array pixels[].

public PixelGrabber (ImageProducer ip, int x, int y, int width, int height, int[] pixels, int offset, int scansize)

Parameters

ip

ImageProducer to use as source of pixel data.

x

x-coordinate of top-left corner of pixel data.

y

y-coordinate of top-left corner of pixel data.

width

Width of pixel data.

height

Height of pixel data.

pixels

Where to store pixel data when grabPixels() called.

offset

Offset from beginning of each line in pixels array.

scansize

Size of each line of data in pixels array.

Description

Constructs a PixelGrabber instance to grab data from the specified area of the image generated by an ImageProducer and store the pixel data from this area in the array pixels[].

Instance Methods

abortGrabbing

public synchronized void abortGrabbing() (New)

Description

Stops the PixelGrabber's image-grabbing process.

getColorModel

public synchronized ColorModel getColorModel() (New)

Returns

The color model the PixelGrabber is using for its array.

getHeight

public synchronized int getHeight() (New)

Returns

The height of the grabbed image, or -1 if the height is not known.

getPixels

public synchronized Object getPixels() (New)

Returns

The array of pixels.

Description

Either a byte array or an integer array is returned, or null if the size and format of the image are not yet known. Because the PixelGrabber may change its mind about what ColorModel it's using, different calls to this method may return different arrays until the image acquisition is complete.

getStatus

public synchronized int getStatus() (New)

Returns

A combination of ImageObserver flags indicating what data is available.

getWidth

public synchronized int getWidth() (New)

Returns

The width of the grabbed image, or -1 if the width is not known.

grabPixels

public boolean grabPixels() throws InterruptedException

Throws

InterruptedException

If image grabbing is interrupted before completion.

Returns

true if the image has completed loading, false if the loading process aborted or an error occurred.

Description

Starts the process of grabbing the pixel data from the source and storing it in the array pixels[] from constructor. Returns when the image is complete, loading aborts, or an error occurs.

public synchronized boolean grabPixels (long ms) throws InterruptedException

Parameters

ms

Milliseconds to wait for completion.

Returns

true if image has completed loading, false if the loading process aborted, or an error or a timeout occurred.

Throws

InterruptedException

If image grabbing is interrupted before completion.

Description

Starts the process of grabbing the pixel data from the source and storing it in the array pixels[] from constructor. Returns when the image is complete, loading aborts, an error occurs, or a timeout occurs.

imageComplete

public synchronized void imageComplete (int status)

Parameters

status

Image loading completion status flags.

Implements

ImageConsumer.imageComplete(int)

Description

Called by the ImageProducer to indicate that the image has been delivered.

setColorModel

void setColorModel (ColorModel model)

Parameters

model

The color model for the image.

Implements

ImageConsumer.setColorModel(ColorModel)

Description

Does nothing.

setDimensions

void setDimensions (int width, int height)

Parameters

width

Width for image.

height

Height for image.

Implements

ImageConsumer.setDimensions(int, int)

Description

Does nothing.

setHints

void setHints (int hints)

Parameters

hints

Image consumption hints.

Implements

ImageConsumer.setHints(int)

Description

Does nothing.

setPixels

void setPixels (int x, int y, int width, int height, ColorModel model, byte[] pixels, int offset, int scansize)

Parameters

x

x-coordinate of top-left corner of pixel data delivered with this method call.

y

y-coordinate of top-left corner of pixel data delivered with this method call.

width

Width of the rectangle of pixel data delivered with this method call.

height

Height of the rectangle of pixel data delivered with this method call.

model

Color model of image data.

pixels

Image data.

offset

Offset from beginning of the pixels array.

scansize

Size of each line of data in pixels array.

Implements

ImageConsumer.setPixels(int, int, int, int, ColorModel, byte[], int, int)

Description

Called by the ImageProducer to deliver pixel data from the image.

void setPixels (int x, int y, int width, int height, ColorModel model, int[] pixels, int offset, int scansize)

Parameters

x

x-coordinate of top-left corner of pixel data delivered with this method call.

y

y-coordinate of top-left corner of pixel data delivered with this method call.

width

Width of the rectangle of pixel data delivered with this method call.

height

Height of the rectangle of pixel data delivered with this method call.

model

Color model of image data.

pixels

Image data.

offset

Offset from beginning of the pixels array.

scansize

Size of each line of data in pixels array.

Implements

ImageConsumer.setPixels(int, int, int, int, ColorModel, int[], int, int)

Description

Called by the ImageProducer to deliver pixel data from the image.

setProperties

void setProperties (Hashtable properties)

Parameters

properties

The properties for the image.

Implements

ImageConsumer.setProperties(Hashtable)

Description

Does nothing.

startGrabbing

public synchronized void startGrabbing() (New)

Description

Starts the PixelGrabber's image-grabbing process.

status

public synchronized int status () (Deprecated)

Returns

The ImageObserver flags OR'ed together representing the available information about the image. Replaced by getStatus().

See Also

ColorModel, Hashtable, Image, ImageConsumer, ImageProducer, InterruptedException, MemoryImageSource, Object


Previous Home Next
MemoryImageSource Book Index ReplicateScaleFilter (New)

Java in a Nutshell Java Language Reference Java AWT Java Fundamental Classes Exploring Java