goldfish/src/Render.java

import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;

import javax.swing.JFrame;

public class Render extends Canvas implements Runnable {
	private static final long serialVersionUID = 1L;

	public static int width;
	public static int height;
	public static int scale = 2;
	
	public String title = "Title";

	private Thread thread;
	private JFrame frame;
	private boolean running = false;

	private Screen screen;

	private BufferedImage image;
	private int[] pixels;

	public Render(int width, int height) {
		this.width = width;
		this.height = height;
		image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		pixels = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
		Dimension size = new Dimension(width*scale, height*scale);
		setPreferredSize(size);
		screen = new Screen(width, height);
		frame = new JFrame();
	}
	
	public Render() {
		width = 320;
		height = 240;
		image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		pixels = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
		Dimension size = new Dimension(width*scale, height*scale);
		setPreferredSize(size);
		screen = new Screen(width, height);

		frame = new JFrame();
	}

	public synchronized void start() {
		running = true;
		thread = new Thread(this, "Display");
		thread.start();
	}

	public synchronized void stop() {
		running = false;
		try {
			thread.join();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	public void run() {
		long lastTime = System.nanoTime();
		long timer = System.currentTimeMillis();
		double delta = 0;
		int frames = 0;
		int updates = 0;
		long now;
		while (running) {
			now = System.nanoTime();
			delta += (now - lastTime) * 6.0 / 100000000.0;
			lastTime = now;
			while (delta >= 1) {
				update();
				updates++;
				delta--;
				render();
				frames++;
			}
			if (System.currentTimeMillis() - timer > 1000) {
				timer += 1000;
				frame.setTitle(title + " | updates: " + updates + " | frames: "+ frames);
				frames = 0;
				updates = 0;
			}
		}
		stop();
	}

	public void update() {
	}

	public void render() {
		BufferStrategy bs = getBufferStrategy();
		if (bs == null) {
			createBufferStrategy(3);
			return;
		}

		screen.clear();
		screen.render();

		for (int i = 0; i < pixels.length; i++) {
			pixels[i] = screen.pixels[i];
		}

		Graphics g = bs.getDrawGraphics();
		g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
		g.dispose();
		bs.show();
	}

	public static void main(String[] args) {
		Render render = new Render(160,120);
		render.frame.setResizable(false);
		render.frame.setTitle(render.title);
		render.frame.add(render);
		render.frame.pack();
		render.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		render.frame.setLocationRelativeTo(null);
		render.frame.setVisible(true);

		render.start();
	}
}