/*
Research Project:   Graphical Database for Category Theory
                    J. Bradbury, Dr. R. Rosebrugh, I. Rutherford
                    Mount Allison University 2001
File:               Matrix44.java
                    (author: Larry Barowski, Auburn University, 7/13/96)
Description:	      A 4x4 Matrix class used in the visual display side of GDCT.
*/

public class Matrix44 //implements Cloneable
{
public double[][] matrix;
public double scale;



public Matrix44()
	{
	matrix = new double[4][4];

	for(int i = 0; i < 4; i++)
		for(int j = 0; j < 4; j++)
			matrix[i][j] = 0.0;
	}



public Matrix44(Matrix44 init)
	{
	matrix = new double[4][4];

	for(int i = 0; i < 4; i++)
		for(int j = 0; j < 4; j++)
			matrix[i][j] = init.matrix[i][j];
	}



public void mult(Matrix44 mat2)
	{
	double[][]	result = new double[4][4];
	double[][]	a = matrix;
	double[][]	b = mat2.matrix;

	for(int i = 0; i < 4; i++)
		for(int j = 0; j < 4; j++)
			result[i][j] = a[i][0] * b[0][j] + a[i][1] * b[1][j] +
				a[i][2] * b[2][j] + a[i][3] * b[3][j];

	for(int i = 0; i < 4; i++)
		for(int j = 0; j < 4; j++)
			a[i][j] = result[i][j];
	}




public void setTo(Matrix44 mat2)
	{
	for(int i = 0; i < 4; i++)
		for(int j = 0; j < 4; j++)
			matrix[i][j] = mat2.matrix[i][j];
	}

}