Package com.day.image

Class DistortOp

java.lang.Object

com.day.image.AbstractBufferedImageOp

com.day.image.DistortOp

All Implemented Interfaces:

java.awt.image.BufferedImageOp

public class DistortOp
extends AbstractBufferedImageOp

The DistortOp class implements the distortion operation on a BufferedImage. The rectangular image is distorted such that the orignal corners of the image are at four new coordinate locations. This distortion is generally not linear and requires quite some calculation.

NOTE: This operation works uses copies of the full image to caclulate the new image. This takes an amount of memory relative to the size of the image. To calculate the needed space let srcWidth and srcHeight be the width and height, resp., of the source and dstWidth and dstHeight be the width and height, resp., of the destination image. Then the the source image needs : srcWidth * srcHeight * 4 channels * 4 bytes per sample bytes and the destination image needs dstWidth * dstHeight * 4 channels * 4 bytes.

Since:

coati

Constructor Summary

Constructors

Constructor	Description
DistortOp(float[][] coords)	Creates the DistortOp object by supplying the coordinates of the new corners of the image, where the result is not cropped and pixels not filled with any part of the distorted image is replaced with black.
DistortOp(float[][] coords, boolean crop, java.awt.Color bgColor)	Creates the DistortOp object by supplying the coordinates of the new corners of the image.

Method Summary

Modifier and Type	Method	Description
java.awt.geom.Rectangle2D	getBounds2D(java.awt.image.BufferedImage src)	Returns the bounding box of the filtered destination image.
java.awt.geom.Point2D	getPoint2D(java.awt.geom.Point2D srcPt, java.awt.geom.Point2D dstPt)	Returns the location of the destination point given a point in the source image.

Methods inherited from class com.day.image.AbstractBufferedImageOp

createCompatibleDestImage, filter, getRenderingHints

Methods inherited from class java.lang.Object

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

Constructor Detail

DistortOp

public DistortOp(float[][] coords)

Creates the DistortOp object by supplying the coordinates of the new corners of the image, where the result is not cropped and pixels not filled with any part of the distorted image is replaced with black.

Parameters:

coords - 4x2 matrix describing an array of 4 scale factors by which to transform each corner of an image distorted image in order top/left, top/right, bottom/left, bottom/right.

Throws:

java.lang.IllegalArgumentException - if not enough - namely four - coordinate pairs are supplied to the constructor.

java.lang.NullPointerException - if the coords parameter is null or if any of the coordinates is null.

DistortOp

public DistortOp(float[][] coords,
                 boolean crop,
                 java.awt.Color bgColor)

Creates the DistortOp object by supplying the coordinates of the new corners of the image.

Parameters:

coords - 4x2 matrix describing an array of 4 scale factors by which to transform each corner of an image distorted image in order top/left, top/right, bottom/left, bottom/right.

crop - true if the result should be cropped to the size of the source image.

bgColor - The color to use for pixels not covered by the distorted part of the image.

Throws:

java.lang.IllegalArgumentException - if not enough - namely four - coordinate pairs are supplied to the constructor.

java.lang.NullPointerException - if the coords parameter is null or if any of the coordinates is null.

Method Detail

getBounds2D

public java.awt.geom.Rectangle2D getBounds2D(java.awt.image.BufferedImage src)

Returns the bounding box of the filtered destination image. The IllegalArgumentException may be thrown if the source image is incompatible with the types of images allowed by the class implementing this filter.

Specified by:

getBounds2D in interface java.awt.image.BufferedImageOp

Overrides:

getBounds2D in class AbstractBufferedImageOp

getPoint2D

public java.awt.geom.Point2D getPoint2D(java.awt.geom.Point2D srcPt,
                                        java.awt.geom.Point2D dstPt)

Returns the location of the destination point given a point in the source image. If dstPt is non-null, it will be used to hold the return value.

Specified by:

getPoint2D in interface java.awt.image.BufferedImageOp

Overrides:

getPoint2D in class AbstractBufferedImageOp