gistfile1.java

/*  
  NAME: Russell Jones  
  DATE: February 21, 2007
  PROJECT: LinSprite
  FILE: GamePanel.java 
*/ 

package linsprite;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JPanel;

public class GamePanel extends JPanel implements 
											Runnable, 
											MouseListener, MouseMotionListener, 
											KeyListener {

	private static final long serialVersionUID = 1L;
	private static final int SCREEN_WIDTH = 800;
	private static final int SCREEN_HEIGHT = 600;
	private long startTime, elapsedTime, currentTime;
	private boolean gameRunning = true;
	private boolean debuggerOn = false;
	private Point point = null;
	private Thread thread;

	private Image testImage;
	private boolean imagesLoaded;
	
	public GamePanel() {
		setBackground(Color.white);
		setMinimumSize(new Dimension (SCREEN_WIDTH, SCREEN_HEIGHT));
		setPreferredSize(new Dimension (SCREEN_WIDTH, SCREEN_HEIGHT));
		addMouseListener(this);
		addMouseMotionListener(this);
		addKeyListener(this);
		setFocusable(true);
		thread = new Thread(this);
		thread.start();
	}
	
	public void loadImages() {
		try {
			testImage = ImageIO.read(new File("images/0-8-000.bmp"));
		} catch (IOException e) {
			e.printStackTrace();
		}
		imagesLoaded = true;
	}

	public void run() {
		loadImages();
		startTime = System.currentTimeMillis();
		currentTime = startTime;
		while (gameRunning) {
			try {
				Thread.sleep(20);
			} catch (Exception ex) {}
			repaint();
			elapsedTime = System.currentTimeMillis() - currentTime;
			currentTime += elapsedTime;
		}
	}
	
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		Graphics2D g2d = (Graphics2D)g;
		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		g2d.setColor(Color.black);
		
		if (imagesLoaded) {
			g.drawImage(testImage, getWidth()/2-testImage.getWidth(null), getHeight()/2-testImage.getHeight(null), null);
		}
		
		if (debuggerOn==true) {
			g2d.drawString("startTime: " + Long.toString(startTime), 10, 20);
			g2d.drawString("currentTime: " + Long.toString(currentTime), 10, 40);
			g2d.drawString("elapsedTime: " + Long.toString(elapsedTime), 10, 60);
			if (point != null)
				g2d.drawString("x: " + point.x + " y: " + point.y, 10, 80);
		}
		
	}

	public void mouseClicked(MouseEvent e) {
		point = e.getPoint();
	}

	public void mouseEntered(MouseEvent e) {
	}

	public void mouseExited(MouseEvent e) {
	}

	public void mousePressed(MouseEvent e) {
	}

	public void mouseReleased(MouseEvent e) {
	}

	public void mouseDragged(MouseEvent e) {
		point = e.getPoint();
	}

	public void mouseMoved(MouseEvent e) {
	}

	public void keyPressed(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_D) debuggerOn = (debuggerOn ? false : true);
		if (e.getKeyCode() == KeyEvent.VK_ESCAPE) System.exit(0);	
	}

	public void keyReleased(KeyEvent e) {
	}

	public void keyTyped(KeyEvent e) {
	}

}