/*******************************************************************************
*Uppgift4.2.1 - IP1.
*Ninis Whiteboard
*
*@Java version "1.5.0_06"
*@Author Véronique Rarchaert
*@vero-rar@dsv.su.se
*********************************************************************************/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.net.*;
import java.io.*;

/*********************************************************************************************
*Uppgift4.2.1 är ett fristående program med ett grafiskt användargränssnitt som implementerar
*ett enkelt distribuerat ritprogram (whiteboard). Allt som ritas sänds med UDP till ett annat
*program identiskt som ritar upp exakt samma bild. Det andra programmet fungerar på samma sätt.
*********************************************************************************************/
public class Draw extends JFrame {
	public Paper p = new Paper();
	public HashSet hs = new HashSet();

/*************************************************************************
*Kör igång programmet med: java Draw <my port> <remote host> <remote port>
**************************************************************************/
	public static void main(String[] arg) {
		if(arg.length == 3)
			new Draw();
		if (arg.length != 3)
			System.out.println("Usage: java Draw <my port> <remote host> <remote port>");
			return;
	}//main

/**********************************************************
*Metod addPoint som lägger till Point
**********************************************************/
	private void addPoint(Point p) {
		hs.add(p);
		repaint();
	}//addPoint

/**********************************************************
*Konstruktor
**********************************************************/
	public Draw() {
		setDefaultCloseOperation(EXIT_ON_CLOSE);
        getContentPane().add(p, BorderLayout.CENTER);
        setSize(640, 480);
        setVisible(true);
	}//konstruktor

	class Paper extends JPanel {
		public HashSet hs = new HashSet();

		public Paper() {
			setBackground(Color.white);
			addMouseListener(new L1());
			addMouseMotionListener(new L2());
		}

		public void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.setColor(Color.black);
			Iterator i = hs.iterator();
			while(i.hasNext()) {
				Point p = (Point)i.next();
				g.fillOval(p.x, p.y, 2, 2);
			}//while
		}//paintComponent

		public synchronized void send(Point p) {
			hs.add(p);
			repaint();
		}//send

		class L1 extends MouseAdapter {
			public void mousePressed(MouseEvent me) {
				send(me.getPoint());
			}//mousePressed
		}

		class L2 extends MouseMotionAdapter {
			public void mouseDragged(MouseEvent me) {
				send(me.getPoint());
			}//mouseDragged
		}

		class Net extends Thread {
			private Draw draw;
			private String host;
			private int myPort;
			private int toPort;
			private String message;

			public Net(Draw draw, String[] args) {
				this.draw = draw;
				this.myPort = Integer.parseInt(args[0]);
				this.host = args[1];
				this.toPort = Integer.parseInt(args[2]);
				start();
			}//Net

			public void send(Point p) {
				try {
					String m = Integer.toString(p.x) + " " + Integer.toString(p.y);
					byte[] data = m.getBytes();
					InetAddress toAddress = InetAddress.getByName(host);
					DatagramPacket packet = new DatagramPacket(data, data.length, toAddress, toPort);
					DatagramSocket s = new DatagramSocket();
					s.send(packet);
				} catch(Exception e) {
					System.out.println(e);
				}//catch
			}//send

			public void run() {
				try {
					DatagramSocket s = new DatagramSocket(myPort);
					while(true) {
						byte[] data = new byte[8192];
						DatagramPacket packet = new DatagramPacket(data, data.length);
						s.receive(packet);
						String[] xy = message.split(" ");
						Point p = new Point(Integer.parseInt(xy[0]), Integer.parseInt(xy[1]));
						draw.addPoint(new Point(p));
					}//while
					} catch(Exception e) {
						System.out.println(e);
					}//catch
			}//run
		}//Net
	}
}