Game.java

package h.c.rpg;

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 h.c.rpg.entity.mob.Player;
import h.c.rpg.graphics.Screen;
import h.c.rpg.input.Keyboard;
import h.c.rpg.level.Level;
import h.c.rpg.level.RandomLevel;
import h.c.rpg.level.SpawnLevel;

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

        public static int width = 300;  // width of screen --- set to 300
        public static int height = width / 16 * 9;      // 168.75 - height of screen --- based on 16:9 ratio
        public static int scale = 3;    // scales up by 3
        public static String title = "16-bit Warrior "; // sets title of window to a string value

        private Thread thread;  // thread(s) = sub-process
        private JFrame frame;
        private Keyboard key;
        private Level level;
        private Player player;
        private boolean running = false; // helps keep program open see line 28 for more

        private Screen screen;

        private BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);     // create an image
        private int[] pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();    // accessing the previously created image

        public Game() {
                Dimension size = new Dimension(width * scale, height * scale);  // sets display screen by giving the screen dimensions
                setPreferredSize(size);                                                                                                 // sets dimensions size in line above to the size of game screen

                screen = new Screen(width, height);     // sets screen integer to width and height
                frame = new JFrame();
                key = new Keyboard();
                level = Level.spawn;
                player = new Player(6 * 16, 4 * 16, key);

                frame.addKeyListener(key);      // checks for keys and applies them and connects the keyboard class interger keyboard update
        }

        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; //60.0;
                double delta = 0;
                int frames = 0;
                int updates = 0;
                frame.requestFocus();

                while (running) {
                        long now = System.nanoTime();
                        delta += (now - lastTime) / ns;
                        lastTime = now;
                        while (delta >= 1) {
                                update(); // Can be replaced by tick() like Minecraft
                                updates++;
                                delta--;
                        }
                        render();
                        frames++;

                        if (System.currentTimeMillis() - timer > 1000) {
                                timer += 1000;
                                System.out.println("[" + updates + " ups, " + frames + " fps" + "]");
                                frame.setTitle(title + "[" + updates + " ups, " + frames + " fps" + "]");
                                updates = 0;
                                frames = 0;
                        }
                }
                stop();
        }

        public void update() {
                key.update();
                player.update();
        }

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

                screen.clear();                         // clears the graphics
                int xScroll = player.x - screen.width / 2;
                int yScroll = player.y - screen.height / 2;
                level.render(xScroll, yScroll, screen);         // renders level & moves with on x / y axis with input
                level.render(player.x, player.x, screen);
//              player.render(screen);          // renders player with screen

                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.setColor(Color.BLACK);              // original white       // black color for coordinates
                //g.setFont(new Font("Verdana", 0, 25));        // size 25 verdana font for coordinates
                //g.drawString("X: " + player.x + ", Y: " + player.y, 700, 22);         // original 350, 300    // string that tracks
                // player.x and player.y for coordinates and places it(the string) on the window at 700, 22 (top-right most corner)
                g.dispose();
                bs.show();
        }

        public static void main(String[] args) {
                Game game = new Game();
                game.frame.setResizable(false); // Can not resize window (it will cause graphica errors)
                game.frame.setTitle(Game.title); // Sets window title to 'Rain' (can be changed)
                game.frame.add(game);
                game.frame.pack(); // Packs the game
                game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Exits the game when you click the red x
                game.frame.setLocationRelativeTo(null);
                game.frame.setVisible(true); // Sets visibility to true

                game.start(); // Starts the game
        }

}