package myGraphics.VectorGrafix;
import myGraphics.VectorGrafix.Matrix;
import myGraphics.VectorGrafix.Vector2d;

public class Matrix2d extends Matrix {
	public Matrix2d() {
		int i, j;
		
		mterm = new double[3][3];
		
		for (i = 0; i < 3; i++) {	/* initialized to identity matrix */
			for (j = 0; j < 3; j++) {
				if (i == j) {
					mterm[i][j] = 1.0;
				} else {
					mterm[i][j] = 0.0;
				}
			}
		}
	}
	
	public void reset()  {
		int i, j;
		
		for (i = 0; i < 3; i++) {	/* reset to identity matrix */
			for (j = 0; j < 3; j++) {
				if (i == j) {
					mterm[i][j] = 1.0;
				} else {
					mterm[i][j] = 0.0;
				}
			}
		}
	}
	
	public Matrix2d multiply(Matrix2d m2) {
		Matrix2d temp = new Matrix2d();
		int i, j, s;
				
		for (i = 0; i < 3; i++) {
			for (j = 0; j < 3; j++) {
				temp.set_term(i, j, 0.0);
				for (s = 0; s < 3; s++) {
					temp.set_term(i, j, 
						temp.get_term(i, j) + (mterm[i][s] * m2.get_term(s, j)));
				}
			}
		}
		return temp;
	}
	
	public Vector2d multiply(Vector2d v) {
		Vector2d temp = new Vector2d();
		int i, s;
				
		for (i = 0; i < 3; i++) {
			temp.set_term(i, 0.0);
			for (s = 0; s < 3; s++) {
				temp.set_term(i,
					temp.get_term(i) + (mterm[i][s] * v.get_term(s)));
			}
		}
		return temp;
	}
}