Game.java

package com.doamax.game.graphics;

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;

import com.doamax.game.graphics.Screen;
import com.doamax.game.input.Keyboard;
import com.doamax.game.level.Level;
import com.doamax.game.level.RandomLevel;

public class Game extends Canvas implements Runnable {

    private static final long serialVersionUID = 1L;
    public static int width = 300;
    public static int height = width / 16 * 9;
    public static int scale = 3;
    public static String title = "Game";

    public Thread thread;
    private JFrame frame;
    private Keyboard key;
    private Level level;
    private boolean running = false;
    private Screen screen;

    private BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    private int[] pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();

    public Game(){
        Dimension size = new Dimension(width * scale, height * scale);
        setPreferredSize(size);

        screen = new Screen(width, height);
        frame = new JFrame();
        key = new Keyboard();
        addKeyListener(key);
        level = new RandomLevel(64,64);

    }

    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();
        final double ns = 1000000000.0 / 60.0;
        double delta = 0;
        int frames = 0;
        int updates = 0;
        requestFocus();
        while(running == true){
            long now = System.nanoTime();
            delta += (now - lastTime) / ns;
            lastTime = now;
            while (delta >= 1){
                update();
                updates++;
                delta--;
            }
            render();
            frames++;

            if (System.currentTimeMillis() - timer > 1000 ){
                timer += 1000;
                frame.setTitle(title + "  |  " + "UPS " + updates + "  |  " + "FPS: " + frames);
                updates = 0;
                frames = 0;
            }
        }
        stop();
    }

    int x = 0, y = 0;

    public void update() {
        key.update();
        if(key.up) y--;
        if(key.down) y++;
        if(key.left) x--;
        if(key.right) x++;
    }
    public void render() {
        BufferStrategy bs = getBufferStrategy();
        if (bs == null){
            createBufferStrategy(3);
            return;
        }

        screen.clear();
        level.render(x, y, screen);

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

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

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

        game.start();

    }
}