Android Open Source - Schooner-3D Matrix

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Dan Mercer/* ww  w.  j av a2s  .co m*/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.supermercerbros.gameengine.collision;

public class Matrix {
  /**
   * The column-major matrix stored in a float array.
   */
  final float m0, m1, m2, m4, m5, m6, m8, m9, m10, m12, m13, m14;

  /**
   * Constructs a new Matrix that can give the position of a point (given in
   * b's coordinate system) in a's coordinate system.
   * 
   * @param a
   * @param b
   */
  public Matrix(float[] a, float[] b) {
    final float[] m = new float[16];
    final float[] aInverse = new float[16];
    
    android.opengl.Matrix.invertM(aInverse, 0, a, 0);
    android.opengl.Matrix.multiplyMM(m, 0, aInverse, 0, b, 0);

    m0 = m[0];
    m1 = m[1];
    m2 = m[2];
    
    m4 = m[4];
    m5 = m[5];
    m6 = m[6];
    
    m8 = m[8];
    m9 = m[9];
    m10 = m[10];
    
    m12 = m[12];
    m13 = m[13];
    m14 = m[14];
  }
  
  public Matrix(float[] m){
    m0 = m[0];
    m1 = m[1];
    m2 = m[2];
    
    m4 = m[4];
    m5 = m[5];
    m6 = m[6];
    
    m8 = m[8];
    m9 = m[9];
    m10 = m[10];
    
    m12 = m[12];
    m13 = m[13];
    m14 = m[14];
  }

  /**
   * Constructs an identity matrix.
   */
  public Matrix() {
    m1 = m2 = m4 = m6 = m8 = m9 = m12 = m13 = m14 = 0.0f;
    m0 = m5 = m10 = 1.0f;
  }

  public Point transform(float x, float y, float z) {
    final float rx = m0 * x + m4 * y + m8 * z + m12;
    final float ry = m1 * x + m5 * y + m9 * z + m13;
    final float rz = m2 * x + m6 * y + m10 * z + m14;
    return new Point(rx, ry, rz);
  }

}

Java Source Code List

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