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java.awt.image.renderable
class RenderableImageOp

java.lang.Object extended by java.awt.image.renderable.RenderableImageOp
All Implemented Interfaces:
RenderableImage

public class RenderableImageOp
extends Object
implements RenderableImage

This class handles the renderable aspects of an operation with help from its associated instance of a ContextualRenderedImageFactory.


Constructor Summary

          Constructs a RenderedImageOp given a ContextualRenderedImageFactory object, and a ParameterBlock containing RenderableImage sources and other parameters.
 
Method Summary
 RenderedImage

          Gets a RenderedImage instance of this image with a default width and height in pixels.
 RenderedImage

          Creates a RenderedImage which represents this RenderableImageOp (including its Renderable sources) rendered according to the given RenderContext.
 RenderedImage
createScaledRendering(int w, int h, RenderingHints hints)

          Creates a RenderedImage instance of this image with width w, and height h in pixels.
 float

          Gets the height in user coordinate space.
 float

          Gets the minimum X coordinate of the rendering-independent image data.
 float

          Gets the minimum Y coordinate of the rendering-independent image data.
 ParameterBlock

          Returns a reference to the current parameter block.
 Object

          Gets a property from the property set of this image.
 String[]

          Return a list of names recognized by getProperty.
 Vector

          Returns a vector of RenderableImages that are the sources of image data for this RenderableImage.
 float

          Gets the width in user coordinate space.
 boolean

          Returns true if successive renderings (that is, calls to createRendering() or createScaledRendering()) with the same arguments may produce different results.
 ParameterBlock

          Change the current ParameterBlock of the operation, allowing editing of image rendering chains.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

RenderableImageOp

public RenderableImageOp(ContextualRenderedImageFactory CRIF,
                         ParameterBlock paramBlock)
Constructs a RenderedImageOp given a ContextualRenderedImageFactory object, and a ParameterBlock containing RenderableImage sources and other parameters. Any RenderedImage sources referenced by the ParameterBlock will be ignored.

Parameters:
CRIF - a ContextualRenderedImageFactory object
paramBlock - a ParameterBlock containing this operation's source images and other parameters necessary for the operation to run.
Method Detail

createDefaultRendering

public RenderedImage createDefaultRendering()
Gets a RenderedImage instance of this image with a default width and height in pixels. The RenderContext is built automatically with an appropriate usr2dev transform and an area of interest of the full image. All the rendering hints come from hints passed in. Implementors of this interface must be sure that there is a defined default width and height.

Returns:
a RenderedImage containing the rendered data.

createRendering

public RenderedImage createRendering(RenderContext renderContext)
Creates a RenderedImage which represents this RenderableImageOp (including its Renderable sources) rendered according to the given RenderContext.

This method supports chaining of either Renderable or RenderedImage operations. If sources in the ParameterBlock used to construct the RenderableImageOp are RenderableImages, then a three step process is followed:

  1. mapRenderContext() is called on the associated CRIF for each RenderableImage source;
  2. createRendering() is called on each of the RenderableImage sources using the backwards-mapped RenderContexts obtained in step 1, resulting in a rendering of each source;
  3. ContextualRenderedImageFactory.create() is called with a new ParameterBlock containing the parameters of the RenderableImageOp and the RenderedImages that were created by the createRendering() calls.

If the elements of the source Vector of the ParameterBlock used to construct the RenderableImageOp are instances of RenderedImage, then the CRIF.create() method is called immediately using the original ParameterBlock. This provides a basis case for the recursion.

The created RenderedImage may have a property identified by the String HINTS_OBSERVED to indicate which RenderingHints (from the RenderContext) were used to create the image. In addition any RenderedImages that are obtained via the getSources() method on the created RenderedImage may have such a property.

Parameters:
renderContext - The RenderContext to use to perform the rendering.
Returns:
a RenderedImage containing the desired output image.

createScaledRendering

public RenderedImage createScaledRendering(int w,
                                           int h,
                                           RenderingHints hints)
Creates a RenderedImage instance of this image with width w, and height h in pixels. The RenderContext is built automatically with an appropriate usr2dev transform and an area of interest of the full image. All the rendering hints come from hints passed in.

If w == 0, it will be taken to equal Math.round(h*(getWidth()/getHeight())). Similarly, if h == 0, it will be taken to equal Math.round(w*(getHeight()/getWidth())). One of w or h must be non-zero or else an IllegalArgumentException will be thrown.

The created RenderedImage may have a property identified by the String HINTS_OBSERVED to indicate which RenderingHints were used to create the image. In addition any RenderedImages that are obtained via the getSources() method on the created RenderedImage may have such a property.

Parameters:
w - the width of rendered image in pixels, or 0.
h - the height of rendered image in pixels, or 0.
hints - a RenderingHints object containg hints.
Returns:
a RenderedImage containing the rendered data.

getHeight

public float getHeight()
Gets the height in user coordinate space. By convention, the usual height of a RenderedImage is equal to 1.0F.

Returns:
the height of the image in user coordinates.

getMinX

public float getMinX()
Gets the minimum X coordinate of the rendering-independent image data.


getMinY

public float getMinY()
Gets the minimum Y coordinate of the rendering-independent image data.


getParameterBlock

public ParameterBlock getParameterBlock()
Returns a reference to the current parameter block.

Returns:
the ParameterBlock of this RenderableImageOp.

getProperty

public Object getProperty(String name)
Gets a property from the property set of this image. If the property name is not recognized, java.awt.Image.UndefinedProperty will be returned.

Parameters:
name - the name of the property to get, as a String.
Returns:
a reference to the property Object, or the value java.awt.Image.UndefinedProperty.

getPropertyNames

public String[] getPropertyNames()
Return a list of names recognized by getProperty.

Returns:
a list of property names.

getSources

public Vector getSources()
Returns a vector of RenderableImages that are the sources of image data for this RenderableImage. Note that this method may return an empty vector, to indicate that the image has no sources, or null, to indicate that no information is available.

Returns:
a (possibly empty) Vector of RenderableImages, or null.

getWidth

public float getWidth()
Gets the width in user coordinate space. By convention, the usual width of a RenderableImage is equal to the image's aspect ratio (width divided by height).

Returns:
the width of the image in user coordinates.

isDynamic

public boolean isDynamic()
Returns true if successive renderings (that is, calls to createRendering() or createScaledRendering()) with the same arguments may produce different results. This method may be used to determine whether an existing rendering may be cached and reused. The CRIF's isDynamic method will be called.

Returns:
true if successive renderings with the same arguments might produce different results; false otherwise.

setParameterBlock

public ParameterBlock setParameterBlock(ParameterBlock paramBlock)
Change the current ParameterBlock of the operation, allowing editing of image rendering chains. The effects of such a change will be visible when a new rendering is created from this RenderableImageOp or any dependent RenderableImageOp.

Parameters:
paramBlock - the new ParameterBlock.
Returns:
the old ParameterBlock.


This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
This page displays the Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.