401 lines
10 KiB
Java
401 lines
10 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.util.vector;
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import java.io.Serializable;
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import java.nio.FloatBuffer;
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/**
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*
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* Holds a 2x2 matrix
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*
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* @author cix_foo <cix_foo@users.sourceforge.net>
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* @version $Revision$
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* $Id$
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*/
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public class Matrix2f extends Matrix implements Serializable {
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private static final long serialVersionUID = 1L;
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public float m00, m01, m10, m11;
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/**
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* Constructor for Matrix2f. The matrix is initialised to the identity.
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*/
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public Matrix2f() {
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setIdentity();
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}
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/**
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* Constructor
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*/
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public Matrix2f(Matrix2f src) {
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load(src);
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}
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/**
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* Load from another matrix
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* @param src The source matrix
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* @return this
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*/
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public Matrix2f load(Matrix2f src) {
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return load(src, this);
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}
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/**
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* Copy the source matrix to the destination matrix.
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* @param src The source matrix
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* @param dest The destination matrix, or null if a new one should be created.
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* @return The copied matrix
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*/
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public static Matrix2f load(Matrix2f src, Matrix2f dest) {
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if (dest == null)
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dest = new Matrix2f();
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dest.m00 = src.m00;
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dest.m01 = src.m01;
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dest.m10 = src.m10;
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dest.m11 = src.m11;
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return dest;
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}
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/**
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* Load from a float buffer. The buffer stores the matrix in column major
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* (OpenGL) order.
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*
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* @param buf A float buffer to read from
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* @return this
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*/
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public Matrix load(FloatBuffer buf) {
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m00 = buf.get();
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m01 = buf.get();
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m10 = buf.get();
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m11 = buf.get();
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return this;
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}
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/**
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* Load from a float buffer. The buffer stores the matrix in row major
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* (mathematical) order.
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*
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* @param buf A float buffer to read from
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* @return this
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*/
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public Matrix loadTranspose(FloatBuffer buf) {
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m00 = buf.get();
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m10 = buf.get();
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m01 = buf.get();
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m11 = buf.get();
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return this;
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}
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/**
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* Store this matrix in a float buffer. The matrix is stored in column
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* major (openGL) order.
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* @param buf The buffer to store this matrix in
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*/
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public Matrix store(FloatBuffer buf) {
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buf.put(m00);
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buf.put(m01);
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buf.put(m10);
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buf.put(m11);
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return this;
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}
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/**
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* Store this matrix in a float buffer. The matrix is stored in row
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* major (maths) order.
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* @param buf The buffer to store this matrix in
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*/
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public Matrix storeTranspose(FloatBuffer buf) {
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buf.put(m00);
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buf.put(m10);
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buf.put(m01);
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buf.put(m11);
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return this;
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}
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/**
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* Add two matrices together and place the result in a third matrix.
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* @param left The left source matrix
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* @param right The right source matrix
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* @param dest The destination matrix, or null if a new one is to be created
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* @return the destination matrix
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*/
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public static Matrix2f add(Matrix2f left, Matrix2f right, Matrix2f dest) {
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if (dest == null)
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dest = new Matrix2f();
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dest.m00 = left.m00 + right.m00;
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dest.m01 = left.m01 + right.m01;
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dest.m10 = left.m10 + right.m10;
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dest.m11 = left.m11 + right.m11;
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return dest;
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}
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/**
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* Subtract the right matrix from the left and place the result in a third matrix.
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* @param left The left source matrix
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* @param right The right source matrix
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* @param dest The destination matrix, or null if a new one is to be created
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* @return the destination matrix
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*/
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public static Matrix2f sub(Matrix2f left, Matrix2f right, Matrix2f dest) {
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if (dest == null)
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dest = new Matrix2f();
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dest.m00 = left.m00 - right.m00;
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dest.m01 = left.m01 - right.m01;
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dest.m10 = left.m10 - right.m10;
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dest.m11 = left.m11 - right.m11;
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return dest;
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}
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/**
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* Multiply the right matrix by the left and place the result in a third matrix.
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* @param left The left source matrix
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* @param right The right source matrix
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* @param dest The destination matrix, or null if a new one is to be created
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* @return the destination matrix
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*/
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public static Matrix2f mul(Matrix2f left, Matrix2f right, Matrix2f dest) {
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if (dest == null)
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dest = new Matrix2f();
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float m00 = left.m00 * right.m00 + left.m10 * right.m01;
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float m01 = left.m01 * right.m00 + left.m11 * right.m01;
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float m10 = left.m00 * right.m10 + left.m10 * right.m11;
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float m11 = left.m01 * right.m10 + left.m11 * right.m11;
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dest.m00 = m00;
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dest.m01 = m01;
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dest.m10 = m10;
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dest.m11 = m11;
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return dest;
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}
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/**
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* Transform a Vector by a matrix and return the result in a destination
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* vector.
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* @param left The left matrix
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* @param right The right vector
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* @param dest The destination vector, or null if a new one is to be created
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* @return the destination vector
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*/
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public static Vector2f transform(Matrix2f left, Vector2f right, Vector2f dest) {
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if (dest == null)
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dest = new Vector2f();
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float x = left.m00 * right.x + left.m10 * right.y;
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float y = left.m01 * right.x + left.m11 * right.y;
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dest.x = x;
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dest.y = y;
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return dest;
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}
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/**
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* Transpose this matrix
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* @return this
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*/
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public Matrix transpose() {
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return transpose(this);
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}
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/**
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* Transpose this matrix and place the result in another matrix.
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* @param dest The destination matrix or null if a new matrix is to be created
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* @return the transposed matrix
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*/
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public Matrix2f transpose(Matrix2f dest) {
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return transpose(this, dest);
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}
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/**
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* Transpose the source matrix and place the result in the destination matrix.
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* @param src The source matrix or null if a new matrix is to be created
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* @param dest The destination matrix or null if a new matrix is to be created
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* @return the transposed matrix
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*/
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public static Matrix2f transpose(Matrix2f src, Matrix2f dest) {
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if (dest == null)
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dest = new Matrix2f();
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float m01 = src.m10;
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float m10 = src.m01;
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dest.m01 = m01;
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dest.m10 = m10;
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return dest;
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}
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/**
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* Invert this matrix
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* @return this if successful, null otherwise
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*/
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public Matrix invert() {
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return invert(this, this);
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}
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/**
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* Invert the source matrix and place the result in the destination matrix.
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* @param src The source matrix to be inverted
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* @param dest The destination matrix or null if a new matrix is to be created
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* @return The inverted matrix, or null if source can't be reverted.
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*/
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public static Matrix2f invert(Matrix2f src, Matrix2f dest) {
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/*
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*inv(A) = 1/det(A) * adj(A);
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*/
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float determinant = src.determinant();
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if (determinant != 0) {
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if (dest == null)
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dest = new Matrix2f();
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float determinant_inv = 1f/determinant;
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float t00 = src.m11*determinant_inv;
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float t01 = -src.m01*determinant_inv;
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float t11 = src.m00*determinant_inv;
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float t10 = -src.m10*determinant_inv;
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dest.m00 = t00;
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dest.m01 = t01;
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dest.m10 = t10;
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dest.m11 = t11;
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return dest;
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} else
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return null;
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}
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/**
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* Returns a string representation of this matrix
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*/
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public String toString() {
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StringBuffer buf = new StringBuffer();
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buf.append(m00).append(' ').append(m10).append(' ').append('\n');
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buf.append(m01).append(' ').append(m11).append(' ').append('\n');
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return buf.toString();
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}
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/**
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* Negate this matrix
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* @return this
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*/
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public Matrix negate() {
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return negate(this);
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}
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/**
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* Negate this matrix and stash the result in another matrix.
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* @param dest The destination matrix, or null if a new matrix is to be created
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* @return the negated matrix
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*/
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public Matrix2f negate(Matrix2f dest) {
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return negate(this, this);
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}
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/**
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* Negate the source matrix and stash the result in the destination matrix.
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* @param src The source matrix to be negated
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* @param dest The destination matrix, or null if a new matrix is to be created
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* @return the negated matrix
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*/
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public static Matrix2f negate(Matrix2f src, Matrix2f dest) {
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if (dest == null)
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dest = new Matrix2f();
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dest.m00 = -src.m00;
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dest.m01 = -src.m01;
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dest.m10 = -src.m10;
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dest.m11 = -src.m11;
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return dest;
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}
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/**
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* Set this matrix to be the identity matrix.
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* @return this
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*/
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public Matrix setIdentity() {
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return setIdentity(this);
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}
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/**
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* Set the source matrix to be the identity matrix.
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* @param src The matrix to set to the identity.
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* @return The source matrix
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*/
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public static Matrix2f setIdentity(Matrix2f src) {
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src.m00 = 1.0f;
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src.m01 = 0.0f;
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src.m10 = 0.0f;
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src.m11 = 1.0f;
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return src;
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}
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/**
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* Set this matrix to 0.
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* @return this
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*/
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public Matrix setZero() {
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return setZero(this);
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}
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public static Matrix2f setZero(Matrix2f src) {
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src.m00 = 0.0f;
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src.m01 = 0.0f;
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src.m10 = 0.0f;
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src.m11 = 0.0f;
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return src;
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}
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/* (non-Javadoc)
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* @see org.lwjgl.vector.Matrix#determinant()
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*/
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public float determinant() {
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return m00 * m11 - m01*m10;
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}
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}
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