Package org.jdesktop.swingx.graphics

Class FilterComposite

java.lang.Object

org.jdesktop.swingx.graphics.FilterComposite

All Implemented Interfaces:

Composite

public class FilterComposite
extends Object
implements Composite

A FilterComposite allows the inclusion of arbitrary image filters during the paint processing of Graphics2D events. By adding a filter composite, the src and destination images are render using a delegated Composite, then post-processed with the filters before returning the result back to the graphics context. This process adds overhead to the painting both is terms of time (the actual processing time) and memory (as a temporary raster must be created to store the intermediate state). Since it is possible to delegate to a filter composite from a filter composite, this may result slow or unresponsive painting. If you are attempting to render with many different filters, it may be better to have one filter composite with many filters (using a compound filter).

It was decided to use BufferedImageOp as the filter because many of these filters already exist. This gives high reusability to code.

Author:

Karl Schaefer

See Also:

• AbstractFilter

Constructor Summary

Constructors

Constructor	Description
FilterComposite(Composite composite)	Creates an empty filter composite for the specified composite.
FilterComposite(Composite composite, BufferedImageOp filter)	Creates a filter for the specified composite.

Method Summary

Modifier and Type	Method	Description
CompositeContext	createContext(ColorModel srcColorModel, ColorModel dstColorModel, RenderingHints hints)
BufferedImageOp	getFilter()	The filter to apply to the graphics context.
void	setFilter(BufferedImageOp filter)	Sets the filter for manipulating the graphics composites.

Methods inherited from class java.lang.Object

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

Constructor Details

FilterComposite

public FilterComposite(Composite composite)

Creates an empty filter composite for the specified composite.

Parameters:

composite - the composite operation to perform prior to filtering

Throws:

NullPointerException - if composite is null

FilterComposite

public FilterComposite(Composite composite,
 BufferedImageOp filter)

Creates a filter for the specified composite.

Parameters:

composite - the composite operation to perform prior to filtering

filter - the filter to apply to the composite result

Throws:

NullPointerException - if composite is null

Method Details

getFilter

public BufferedImageOp getFilter()

The filter to apply to the graphics context.

Returns:

the current filter

setFilter

public void setFilter(BufferedImageOp filter)

Sets the filter for manipulating the graphics composites.

A null filter will result in no filtering.

Parameters:

filter - the new filter

createContext

public CompositeContext createContext(ColorModel srcColorModel,
 ColorModel dstColorModel,
 RenderingHints hints)

Specified by:

createContext in interface Composite