oracle.cabo.image
Class AbstractImageRenderer

java.lang.Object
  |
  +--oracle.cabo.image.AbstractImageRenderer

All Implemented Interfaces:

java.awt.image.ImageObserver, ImageRenderer

Direct Known Subclasses:

PainterImageRenderer

public abstract class AbstractImageRenderer

extends java.lang.Object

implements ImageRenderer, java.awt.image.ImageObserver

Abstract base class that implements ImageRenderer.

Subclasses should always create their images by calling createImage() so that the type of image

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

protected

AbstractImageRenderer() Create an AbstractImageRenderer.

Method Summary

protected java.awt.image.BufferedImage	createImage(int width, int height) Creates an Image with the given width and height.
boolean	imageUpdate(java.awt.Image img, int infoflags, int x, int y, int width, int height) Implementation of ImageObserver.ImageUpdate().
abstract java.awt.Image	renderImage(ImageContext context, java.util.Dictionary requestedProperties, java.util.Dictionary responseProperties) Render the BufferedImage given the Dictionary of properties that describe what to render.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractImageRenderer

protected AbstractImageRenderer()

Create an AbstractImageRenderer.

Method Detail

renderImage

public abstract java.awt.Image renderImage(ImageContext context,
                                           java.util.Dictionary requestedProperties,
                                           java.util.Dictionary responseProperties)

Render the BufferedImage given the Dictionary of properties that describe what to render.

Specified by:

renderImage in interface ImageRenderer

Following copied from interface: oracle.cabo.image.ImageRenderer

Parameters:

context - The rendering context

requestedProperties - Dictionary of requested properties. The keys for this dictionary are the KEY constants defined in ImageConstants.

responseProperties - Dictionary for response properties. The keys for this dictionary are the RESPONSE_KEY constants defined in ImageConstants.

Returns:

an Image containing the rendered results

See Also:

ImageContext, ImageConstants

imageUpdate

public boolean imageUpdate(java.awt.Image img,
                           int infoflags,
                           int x,
                           int y,
                           int width,
                           int height)

Implementation of ImageObserver.ImageUpdate().

Specified by:

imageUpdate in interface java.awt.image.ImageObserver

See Also:

ImageObserver

createImage

protected java.awt.image.BufferedImage createImage(int width,
                                                   int height)

Creates an Image with the given width and height. Subclasses should use this method to create images so that the correct memory representation is used.