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## java.awt.image.renderable
Class RenderableImageProducer

    java.lang.Object
      |
      +--java.awt.image.renderable.RenderableImageProducer

All Implemented Interfaces:
  ImageProducer, Runnable

public class RenderableImageProducer
extends Object
implements ImageProducer, Runnable

An adapter class that implements ImageProducer to allow the asynchronous production of a RenderableImage. The size of the ImageConsumer is determined by the scale factor of the usr2dev transform in the RenderContext. If the RenderContext is null, the default rendering of the RenderableImage is used. This class implements an asynchronous production that produces the image in one thread at one resolution. This class may be subclassed to implement versions that will render the image using several threads. These threads could render either the same image at progressively better quality, or different sections of the image at a single resolution.

Constructor Summary
`RenderableImageProducer(RenderableImage rdblImage, RenderContext rc)` Constructs a new RenderableImageProducer from a RenderableImage and a RenderContext.

Method Summary
`void` | `addConsumer(ImageConsumer ic)` Adds an ImageConsumer to the list of consumers interested in data for this image.
`boolean` | `isConsumer(ImageConsumer ic)` Determine if an ImageConsumer is on the list of consumers currently interested in data for this image.
`void` | `removeConsumer(ImageConsumer ic)` Remove an ImageConsumer from the list of consumers interested in data for this image.
`void` | `requestTopDownLeftRightResend(ImageConsumer ic)` Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.
`void` | `run()` The runnable method for this class.
`void` | `setRenderContext(RenderContext rc)` Sets a new RenderContext to use for the next startProduction() call.
`void` | `startProduction(ImageConsumer ic)` Adds an ImageConsumer to the list of consumers interested in data for this image, and immediately starts delivery of the image data through the ImageConsumer interface.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### RenderableImageProducer

    public RenderableImageProducer(RenderableImage rdblImage,
                                   RenderContext rc)

  Constructs a new RenderableImageProducer from a RenderableImage and a RenderContext.

Parameters:
  `rdblImage` - the RenderableImage to be rendered.
  `rc` - the RenderContext to use for producing the pixels.

Method Detail

### setRenderContext

    public void setRenderContext(RenderContext rc)

  Sets a new RenderContext to use for the next startProduction() call.

  Parameters:
    `rc` - the new RenderContext.

### addConsumer

    public void addConsumer(ImageConsumer ic)

  Adds an ImageConsumer to the list of consumers interested in data for this image.

  Specified by:
    `addConsumer` in interface `ImageProducer`
  Parameters:
    `ic` - an ImageConsumer to be added to the interest list.
  See Also:
    `ImageProducer.startProduction(java.awt.image.ImageConsumer)`

### isConsumer

    public boolean isConsumer(ImageConsumer ic)

  Determine if an ImageConsumer is on the list of consumers currently interested in data for this image.

  Specified by:
    `isConsumer` in interface `ImageProducer`
  Parameters:
    `ic` - the ImageConsumer to be checked.
  Returns:
    true if the ImageConsumer is on the list; false otherwise.

### removeConsumer

    public void removeConsumer(ImageConsumer ic)

  Remove an ImageConsumer from the list of consumers interested in data for this image.

  Specified by:
    `removeConsumer` in interface `ImageProducer`
  Parameters:
    `ic` - the ImageConsumer to be removed.

### startProduction

    public void startProduction(ImageConsumer ic)

  Adds an ImageConsumer to the list of consumers interested in data for this image, and immediately starts delivery of the image data through the ImageConsumer interface.

  Specified by:
    `startProduction` in interface `ImageProducer`
  Parameters:
    `ic` - the ImageConsumer to be added to the list of consumers.
  See Also:
    `ImageProducer.addConsumer(java.awt.image.ImageConsumer)`

### requestTopDownLeftRightResend

    public void requestTopDownLeftRightResend(ImageConsumer ic)

  Requests that a given ImageConsumer have the image data delivered one more time in top-down, left-right order.

  Specified by:
    `requestTopDownLeftRightResend` in interface `ImageProducer`
  Parameters:
    `ic` - the ImageConsumer requesting the resend.
  See Also:
    `ImageConsumer.setHints(int)`

### run

    public void run()

  The runnable method for this class. This will produce an image using the current RenderableImage and RenderContext and send it to all the ImageConsumer currently registered with this class.

  Specified by:
    `run` in interface `Runnable`
  See Also:
    `Thread.run()`

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.