BandCombineOp (Java Platform SE 6)

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.

Overview

Package

Class

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

java.awt.image
class BandCombineOp

java.lang.Object
  java.awt.image.BandCombineOp

All Implemented Interfaces:: RasterOp

public class BandCombineOp
extends Object
implements RasterOp

This class performs an arbitrary linear combination of the bands in a Raster, using a specified matrix.

The width of the matrix must be equal to the number of bands in the source Raster, optionally plus one. If there is one more column in the matrix than the number of bands, there is an implied 1 at the end of the vector of band samples representing a pixel. The height of the matrix must be equal to the number of bands in the destination.

For example, a 3-banded Raster might have the following transformation applied to each pixel in order to invert the second band of the Raster.

   [ 1.0   0.0   0.0    0.0  ]     [ b1 ]    
   [ 0.0  -1.0   0.0  255.0  ]  x  [ b2 ]
   [ 0.0   0.0   1.0    0.0  ]     [ b3 ]
                                   [ 1 ]

Note that the source and destination can be the same object.

Constructor Summary
`BandCombineOp(float[][] matrix, RenderingHints hints)` Constructs a `BandCombineOp` with the specified matrix.

Method Summary
`WritableRaster`	`createCompatibleDestRaster(Raster src)` Creates a zeroed destination `Raster` with the correct size and number of bands.
`WritableRaster`	`filter(Raster src, WritableRaster dst)` Transforms the `Raster` using the matrix specified in the constructor.
`Rectangle2D`	`getBounds2D(Raster src)` Returns the bounding box of the transformed destination.
`float[][]`	`getMatrix()` Returns a copy of the linear combination matrix.
`Point2D`	`getPoint2D(Point2D srcPt, Point2D dstPt)` Returns the location of the corresponding destination point given a point in the source `Raster`.
`RenderingHints`	`getRenderingHints()` Returns the rendering hints for this operation.

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

Constructor Detail

BandCombineOp

public BandCombineOp(float[][] matrix,
                     RenderingHints hints)

Constructs a BandCombineOp with the specified matrix. The width of the matrix must be equal to the number of bands in the source Raster, optionally plus one. If there is one more column in the matrix than the number of bands, there is an implied 1 at the end of the vector of band samples representing a pixel. The height of the matrix must be equal to the number of bands in the destination.

The first subscript is the row index and the second is the column index. This operation uses none of the currently defined rendering hints; the RenderingHints argument can be null.

Parameters:: matrix - The matrix to use for the band combine operation.; hints - The RenderingHints object for this operation. Not currently used so it can be null.

Method Detail

createCompatibleDestRaster

public WritableRaster createCompatibleDestRaster(Raster src)

Creates a zeroed destination Raster with the correct size and number of bands. An IllegalArgumentException may be thrown if the number of bands in the source is incompatible with the matrix. See the class comments for more details.

Parameters:: src - The Raster to be filtered.
Returns:: The zeroed destination Raster.

filter

public WritableRaster filter(Raster src,
                             WritableRaster dst)

Transforms the Raster using the matrix specified in the constructor. An IllegalArgumentException may be thrown if the number of bands in the source or destination is incompatible with the matrix. See the class comments for more details.

If the destination is null, it will be created with a number of bands equalling the number of rows in the matrix. No exception is thrown if the operation causes a data overflow.

Parameters:: src - The Raster to be filtered.; dst - The Raster in which to store the results of the filter operation.
Returns:: The filtered Raster.

getBounds2D

public final Rectangle2D getBounds2D(Raster src)

Returns the bounding box of the transformed destination. Since this is not a geometric operation, the bounding box is the same for the source and destination. An IllegalArgumentException may be thrown if the number of bands in the source is incompatible with the matrix. See the class comments for more details.

Parameters:: src - The Raster to be filtered.
Returns:: The Rectangle2D representing the destination image's bounding box.

getMatrix

public final float[][] getMatrix()

Returns a copy of the linear combination matrix.

Returns:: The matrix associated with this band combine operation.

getPoint2D

public final Point2D getPoint2D(Point2D srcPt,
                                Point2D dstPt)

Returns the location of the corresponding destination point given a point in the source Raster. If dstPt is specified, it is used to hold the return value. Since this is not a geometric operation, the point returned is the same as the specified srcPt.

Parameters:: srcPt - The Point2D that represents the point in the source Raster; dstPt - The Point2D in which to store the result.
Returns:: The Point2D in the destination image that corresponds to the specified point in the source image.

getRenderingHints

public final RenderingHints getRenderingHints()

Returns the rendering hints for this operation.

Returns:: The RenderingHints object associated with this operation. Returns null if no hints have been set.