/*
 * Drawing.java 1.0
 *
 * Classes for lecture 2.
 * The only thing to concentrate on is the tree method
 * in class Drawing, and the clone method of class Pen.
 * The clone method is used in one of the exercises.
 */
 

import javax.swing.*; 
import java.awt.*;

public class Drawing {
	
	public static void main(String args[]) {
		System.out.println("Starting Drawing...");
		MyFrame mainFrame = new MyFrame();
		/* Wait a second before drawing, to make sure the 
		 * window is really in the front of all other windows
		 */
		try{Thread.sleep(1000);}catch(Exception e){};
		/* Make a pen on the main window, and 
		 * locate the pen at the center bottom, pointing
		 * upwards
		 */
		Pen p = mainFrame.makePen("Blue");
		p.turn(180);
		p.jumpTo(180,350);
		/* draw a tree 50 pixels height */
		tree(p,60);
	}

	private static void tree(Pen p, int height){
		if (height < 2 )
			return;
		p.move(height);
		
		Pen leftTree = (Pen)p.clone();
		leftTree.turn(30);
		
		Pen rightTree = (Pen)p.clone();
		rightTree.turn(-45);
		
		tree(leftTree,height-10);
		tree(rightTree, height-5);
	}
	
}

class MyFrame extends JFrame {

	MyFrame(){
		super();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(400, 400);
		setTitle("Drawing");
		setVisible(true);
	}
	Pen makePen(String color){
		return new Pen(color,this);
	}

}

class Pen implements Cloneable {
		
	private int x,y;
	private double heading;
	
	private final Component myComponent;
	
	private Color col;
	
	public Pen(String color, Component c){
		myComponent = c;
		x = c.getWidth()/2;// middle of component
		y = c.getHeight()/2;
		if ( color.equals("Red") ) col = Color.RED;
		if ( color.equals("Green") ) col = Color.GREEN;
		if ( color.equals("Blue") ) col = Color.BLUE;
		
	}
	
	public void jumpTo(int newX, int newY){
		x = newX;
		y = newY;
	}
	
	public void moveTo(int newX, int newY){
		Graphics g = myComponent.getGraphics();
		g.setColor(col);
		g.drawLine((int)x,(int)y,(int)newX,(int)newY);
		x = newX;
		y = newY;
	}
	
	public void move(int length){
		int dX = (int)Math.round(length*Math.sin(Math.toRadians(heading)));
		int dY = (int)Math.round(length*Math.cos(Math.toRadians(heading)));
		moveTo(x+dX, y+dY);
	}
	
	
	public void turn(double angleChange){
		heading = (heading + angleChange) % 360;
	}
	
	public String toString(){
		return "["+x+","+y+"("+heading+")]";
	}
	
	public Object clone(){
		try{
			Pen c = (Pen)super.clone();
			return c; //super.clone();
		}catch(CloneNotSupportedException e) {
			throw new RuntimeException("super class doesn’t implement cloneable");
		}
	}

}