javax.media.jai
Class BorderExtenderCopy

java.lang.Object
  |
  +--javax.media.jai.BorderExtender
        |
        +--javax.media.jai.BorderExtenderCopy

All Implemented Interfaces:

Serializable

public final class BorderExtenderCopy

extends BorderExtender

A subclass of BorderExtender that implements border extension by filling all pixels outside of the image bounds with copies of the edge pixels. For example, the image:

A	B	C
D	E	F
G	H	I

if extended by adding two extra rows to the top and bottom and two extra columns on the left and right sides, would become:

A	A	A	B	C	C	C
A	A	A	B	C	C	C
A	A	A	B	C	C	C
D	D	D	E	F	F	F
G	G	G	H	I	I	I
G	G	G	H	I	I	I
G	G	G	H	I	I	I

Although this type of extension is not particularly visually appealing, it is very useful as a way of padding source images prior to area or geometric operations, such as convolution, scaling, or rotation.

See Also:

BorderExtender, Serialized Form

Fields inherited from class javax.media.jai.BorderExtender

BORDER_COPY, BORDER_REFLECT, BORDER_WRAP, BORDER_ZERO

Method Summary

void	extend(WritableRaster raster, PlanarImage im) Fills in the portions of a given Raster that lie outside the bounds of a given PlanarImage with copies of the edge pixels of the image.

Methods inherited from class javax.media.jai.BorderExtender

createInstance

Methods inherited from class java.lang.Object

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

Method Detail

extend

public final void extend(WritableRaster raster,
                         PlanarImage im)

Fills in the portions of a given Raster that lie outside the bounds of a given PlanarImage with copies of the edge pixels of the image.

The portion of raster that lies within im.getBounds() is not altered.

Overrides:

extend in class BorderExtender

Parameters:

raster - The WritableRaster the border area of which is to be filled with copies of the edge pixels of the image.

im - The PlanarImage which will provide the edge data with which to fill the border area of the WritableRaster.

Throws:

IllegalArgumentException - if either parameter is null.