import java.lang.Object;
import java.lang.Math;
import java.awt.geom.*;

/**
 * <p>Title: TransfMatr</p>
 * <p>Description: Contains a list of mathematical Transforms</p>
 * Cassandra Robinson
 * version 1.0
 */

public class TransfMatr {
	double xval;
	double yval;
	double angleval;
    double [][] transfby;
	int type;
	final double PI=3.14159265;


	public TransfMatr(double ang, double x1, double y1, int ttype) {
		//input values for transforming a matrix
		//if unneeded give a 0 value
		xval = x1;
		yval = y1;
		angleval = ang*PI/180;
		type = ttype;

		switch ( ttype ){
			case 0:
			    //identity
			    double [][] identity = {
						{1., 0., 0.},
						{0., 1., 0.},
						{0., 0., 1.}
			    };
			    transfby = identity;
			    break;
	
			case 1:
				//translation
				double [][] translation = {
					{ 1., 0., xval },
					{ 0., 1., yval },
					{ 0., 0., 1. }
				};
				transfby = translation;
				break;
	
			case 2:
			    //scaling
			    double [][] scaling = {
						{xval, 0., 0.},
						{0., yval, 0.},
						{0., 0., 1.}
			    };
			    transfby = scaling;
			    break;
			    
			case 3:
			    //rotation

			    double [][] rotation = {
						{java.lang.Math.cos( angleval ), -java.lang.Math.sin( angleval ) , 0.}, 
						{java.lang.Math.sin( angleval ),java.lang.Math.cos( angleval ) , 0.},
						{0., 0., 1.}
			    };
			    transfby = rotation;
			    break;
			    
			case 4:
			    //shear by x
			    double [][] shearbyx = {
						{1., xval, 0.},
						{0., 1., 0.},
						{0., 0., 1.}
			    };
			    transfby = shearbyx;
			    break;
		
			case 5:
			    //shear by y	
			    double [][] shearbyy = {
						{1., 0., 0.},
						{yval, 1., 0.},
						{0., 0., 1.}
			    };
			    transfby = shearbyy;
			    break;
	
	
			default:
				System.out.println("Constructor for TransfMatr given invalid type of transformation.");
				break;
		}
	}


    void transform(Point2D point)
    {
		double x;
		double y;
	
		//tranform  
		x = (transfby[0][0] * point.getX() ) + (transfby[0][1] * point.getY() ) + (transfby[0][2]);
		y = (transfby[1][0] * point.getX() ) + (transfby[1][1] * point.getY() ) + (transfby[1][2]);
             
		point.setLocation(x,y);
    }

	void print()
	{
		System.out.print(" [" + transfby[0][0] + ","
							  + transfby[0][1] + ","
							  + transfby[0][2] + " ] " );
		System.out.print("\n");
		System.out.print(" [" + transfby[1][0] + ","
							  + transfby[1][1] + ","
							  + transfby[1][2] + " ] " );
		System.out.print("\n");
		System.out.print(" [" + transfby[2][0] + ","
							  + transfby[2][1] + ","
							  + transfby[2][2] + " ] " );
		System.out.print("\n");
	}
}