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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
*/
package net.java.joglutils.msg.math;
/** Arbitrary-size single-precision matrix class. Currently very
simple and only supports a few needed operations. */
public class Matf {
private float[] data;
private int nCol; // number of columns
private int nRow; // number of columns
public Matf(int nRow, int nCol) {
data = new float[nRow * nCol];
this.nCol = nCol;
this.nRow = nRow;
}
public Matf(Matf arg) {
nRow = arg.nRow;
nCol = arg.nCol;
data = new float[nRow * nCol];
System.arraycopy(arg.data, 0, data, 0, data.length);
}
public int nRow() {
return nRow;
}
public int nCol() {
return nCol;
}
/** Gets the (i,j)th element of this matrix, where i is the row
index and j is the column index */
public float get(int i, int j) {
return data[nCol * i + j];
}
/** Sets the (i,j)th element of this matrix, where i is the row
index and j is the column index */
public void set(int i, int j, float val) {
data[nCol * i + j] = val;
}
/** Returns transpose of this matrix; creates new matrix */
public Matf transpose() {
Matf tmp = new Matf(nCol, nRow);
for (int i = 0; i < nRow; i++) {
for (int j = 0; j < nCol; j++) {
tmp.set(j, i, get(i, j));
}
}
return tmp;
}
/** Returns this * b; creates new matrix */
public Matf mul(Matf b) throws DimensionMismatchException {
if (nCol() != b.nRow())
throw new DimensionMismatchException();
Matf tmp = new Matf(nRow(), b.nCol());
for (int i = 0; i < nRow(); i++) {
for (int j = 0; j < b.nCol(); j++) {
float val = 0;
for (int t = 0; t < nCol(); t++) {
val += get(i, t) * b.get(t, j);
}
tmp.set(i, j, val);
}
}
return tmp;
}
/** Returns this * v, assuming v is a column vector. */
public Vecf mul(Vecf v) throws DimensionMismatchException {
if (nCol() != v.length()) {
throw new DimensionMismatchException();
}
Vecf out = new Vecf(nRow());
for (int i = 0; i < nRow(); i++) {
float tmp = 0;
for (int j = 0; j < nCol(); j++) {
tmp += get(i, j) * v.get(j);
}
out.set(i, tmp);
}
return out;
}
/** If this is a 2x2 matrix, returns it as a Mat2f. */
public Mat2f toMat2f() throws DimensionMismatchException {
if (nRow() != 2 || nCol() != 2) {
throw new DimensionMismatchException();
}
Mat2f tmp = new Mat2f();
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
tmp.set(i, j, get(i, j));
}
}
return tmp;
}
/** If this is a 3x3 matrix, returns it as a Mat3f. */
public Mat3f toMat3f() throws DimensionMismatchException {
if (nRow() != 3 || nCol() != 3) {
throw new DimensionMismatchException();
}
Mat3f tmp = new Mat3f();
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
tmp.set(i, j, get(i, j));
}
}
return tmp;
}
/** If this is a 4x4 matrix, returns it as a Mat4f. */
public Mat4f toMat4f() throws DimensionMismatchException {
if (nRow() != 4 || nCol() != 4) {
throw new DimensionMismatchException();
}
Mat4f tmp = new Mat4f();
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
tmp.set(i, j, get(i, j));
}
}
return tmp;
}
}
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