// Parallel Computing
//
// Display applet
//
// Author  Matthew Caryl
// Created 2.2.97

package Parallel;

import java.awt.Graphics;
import java.awt.Color;
import java.awt.Event;
import java.applet.Applet;
import java.lang.System;
import java.io.*;

public final class Display extends Applet implements Viewer {
	//
	// Private interface
	//
	
	public static final Color		backgroundColor = Color.black;
	public static final Color		outlineColor = Color.white;
	
	private Graphics		graphics;
	private Computer		computer;

	//
	// Public interface
	//
	
	public void init() {
		setBackground(backgroundColor);
		graphics = this.getGraphics();
		Computer.registerComputer(this, getParameter("computerName"), 0, 0);
		}
	
	public void destroy() {
		stop();
		if (graphics != null)
			graphics.dispose();
		}

	public void paint(Graphics g) {
		g.setColor(backgroundColor);
		g.fillRect(0, 0, size().width, size().height);
		g.setColor(outlineColor);
		
		if (computer != null) {
			String message = new String("Computer is present");
			int messageWidth = graphics.getFontMetrics(graphics.getFont()).stringWidth(message);
			int messageHeight = graphics.getFontMetrics(graphics.getFont()).getHeight();
			
 			g.drawString(message, size().width / 2 - messageWidth / 2, size().height / 2 + messageHeight / 2);
			}
		else {
			String message = new String("Computer is not present");
			int messageWidth = graphics.getFontMetrics(graphics.getFont()).stringWidth(message);
			int messageHeight = graphics.getFontMetrics(graphics.getFont()).getHeight();
			
 			g.drawString(message, size().width / 2 - messageWidth / 2, size().height / 2 + messageHeight / 2);
 			}
		
		}
	
	public String[][] getParameterInfo() {
		String[][] info = {{"computerName", "string", "name of computer to access"}};
		return info;
		}
	
	public void setComputer(Computer C) {
		System.out.println("set display");
		
		computer = C;
		update(graphics);
		}
	}