bijnum
Class BIJtransform

java.lang.Object
  bijnum.BIJtransform

public class BIJtransform
extends java.lang.Object

This class implements static transformation matrix operations for 2-D and 3-D transformation matrices. Interface leans heavily on Foley, van Dam. Computer Graphics. Second ed. Homogenuous coordinate systems. Copyright (c) 1999-2003, Michael Abramoff. All rights reserved.

Constructor Summary

BIJtransform()

Method Summary

static float[][]	newMatrix(int dimensions) Create a new (diagonal) transformation matrix for the number of dimensions.
static float[][]	rotatex(float[][] m, double theta) Rotate a transformation matrix around the x-axis.
static float[][]	rotatey(float[][] m, double theta) Rotate a transformation matrix around the y axis.
static float[][]	rotatez(float[][] m, double theta) Rotate a transformation matrix around the z axis.
static float[][]	scale(float[][] m, double sx, double sy) Scale a 2-D transformation matrix by sx, sy.
static float[][]	scale(float[][] m, double sx, double sy, double sz) Scale a 3-D transformation matrix by sx, sy, sz.
static float[][]	translate(float[][] m, double tx, double ty) Translate a 2-D transformation matrix by these values.
static float[][]	translate(float[][] m, double tx, double ty, double tz) Translate a 3-D transformation matrix by these values.

Methods inherited from class java.lang.Object

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

Constructor Detail

BIJtransform

public BIJtransform()

Method Detail

newMatrix

public static float[][] newMatrix(int dimensions)

Create a new (diagonal) transformation matrix for the number of dimensions. Matrix will be one larger because we need a homogenuous coordinate system.

translate

public static float[][] translate(float[][] m,
                                  double tx,
                                  double ty,
                                  double tz)

Translate a 3-D transformation matrix by these values.

Parameters:

m - the transformation matrix

tx,ty,tz - the amounts to translate on each of the axes.

Returns:

a new, transformed matrix.

translate

public static float[][] translate(float[][] m,
                                  double tx,
                                  double ty)

Translate a 2-D transformation matrix by these values.

Parameters:

m - the transformation matrix

tx,ty - the amounts to translate on each of the axes.

Returns:

a new, transformed matrix.

scale

public static float[][] scale(float[][] m,
                              double sx,
                              double sy,
                              double sz)

Scale a 3-D transformation matrix by sx, sy, sz.

Parameters:

m - the transformation matrix

sx,sy,sz - the amounts to scale by on each of the axes.

Returns:

a new, transformed matrix.

scale

public static float[][] scale(float[][] m,
                              double sx,
                              double sy)

Scale a 2-D transformation matrix by sx, sy.

Parameters:

m - the transformation matrix

sx,sy - the amounts to scale by on each of the axes.

Returns:

a new, transformed matrix.

rotatex

public static float[][] rotatex(float[][] m,
                                double theta)

Rotate a transformation matrix around the x-axis. I dont think you can rotate a 2-D image about the x-axis.

Parameters:

m - the transformation matrix

theta - the amount to rotate (in degrees)

Returns:

a new, transformed matrix.

rotatey

public static float[][] rotatey(float[][] m,
                                double theta)

Rotate a transformation matrix around the y axis. I dont think you can rotate a 2-D image about the y-axis.

Parameters:

m - the transformation matrix

theta - the amount to rotate (in degrees)

Returns:

a new, transformed matrix.

rotatez

public static float[][] rotatez(float[][] m,
                                double theta)

Rotate a transformation matrix around the z axis. I dont think you can rotate a 2-D image about the z-axis.

Parameters:

m - the transformation matrix

theta - the amount to rotate (in degrees)

Returns:

a new, transformed matrix.