Snakegame

import java.awt.image.BufferStrategy;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.Applet;
import java.awt.Graphics2D;
import java.util.ArrayList;
import java.util.Random;



public class SnakeGame extends JFrame implements KeyListener{
	final static int INGAME=1;
	final static int GAMEOVER=2;
	int currentState=INGAME;
	Canvas c;
	Button startButton, stopButton;
	boolean animationRunning = true;
	private BufferStrategy	strategy;
	final static int CANVAS_WIDTH =950;
	final static int CANVAS_HEIGHT = 950;
	int speed, mouseX, mouseY;
	int fruitX, fruitY, fruitSize;
	int score = 0;
	int highscore =0;
	String playerwithhighscore = "";
	Random randomGen = new Random();
	ArrayList<Snake> snake = new ArrayList<Snake>();
	Snake player = new Snake();
	Fruit fruit = new Fruit();
	int FPS = 20 ;

	public SnakeGame(){
		c = new Canvas();
		c.setSize(950, 950);

		//restart();

		// Add a window listner for close button
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});

		c.addKeyListener(this);
		this.getContentPane().add(c, BorderLayout.CENTER);
		this.setTitle("Snake Game");
		this.pack();
		this.setVisible(true);
		c.createBufferStrategy(2);
		strategy = c.getBufferStrategy();
		do{
			try{
				FPS = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the speed of the snake between 10 and 30", "FPS"));
			}catch(NumberFormatException nfe){
				FPS=0;
			}
		}while(FPS<10 || FPS>30);
		 restartGame();
		new AnimationThread(this);

	}



	public static void main(String s[]) {
		new SnakeGame();

	}
	public double getDistance(double sx, double sy, double ex, double ey){
		double xdiff = sx-ex;
		double ydiff = sy-ey;
		return Math.sqrt((xdiff*xdiff)+(ydiff*ydiff));
	}

	public int randomInteger(int min, int max){
		return min + (int)(Math.random() * ((max - min) + 1));
	}

	public void collisionDetection(){
			if(player.x <= 0 || player.x >= c.getWidth() || player.y <= 0 || player.y >= c.getHeight()){

			gameOver();

			}
			double distance = getDistance (fruit.x,fruit.y, player.x, player.y);
			if(distance < 10){
				fruit.x = randomInteger(10, c.getWidth()-10);
				fruit.x=(fruit.x/10)*10;
				fruit.y = randomInteger(10, c.getHeight()-10);
				fruit.y=(fruit.y/10)*10;
				score++;
				snake.add(new Snake());
				}

                    for (int i = 0; i < snake.size(); i++) {

        if ((player.x == snake.get(i).x) && player.y == snake.get(i).y) {
            gameOver();
        }
    }


				//if(fruit.x == player.x && fruit.y == player.y){

				//}
	}


	public void gameOver(){
		if (score > highscore){
			highscore=score;
			playerwithhighscore = JOptionPane.showInputDialog(null, "You beat the highscore!", "Enter your name");

		}
	currentState=GAMEOVER;

	//score=0;
	}


	public void updateGame(){
		updateSnake();
		player.x += player.xdir;

		player.y += player.ydir;
		collisionDetection();
	}

	public void updateSnake(){
		int i=snake.size()-1;
		while (i > 0){
			snake.get(i).x = snake.get(i-1).x;
			snake.get(i).y = snake.get(i-1).y;
			i=i-1;
		}
		snake.get(0).x =player.x;
		snake.get(0).y =player.y;
	}
   public void keyTyped(KeyEvent e) { }
   public void keyReleased(KeyEvent e) { }

   public void keyPressed(KeyEvent e) {
		char key = e.getKeyChar();
		if((key == 'W' || key == 'w') && player.ydir == 0){
			player.ydir=-Snake.SIZE;
			player.xdir=0;
		}else if((key == 'S' || key == 's') && player.ydir == 0){
			player.ydir=Snake.SIZE;
			player.xdir=0;
		}else if((key == 'A' || key == 'a') && player.xdir == 0){
			player.xdir=-Snake.SIZE;
			player.ydir=0;
		}else if((key == 'D' || key == 'd') && player.xdir == 0){
			player.xdir=Snake.SIZE;
			player.ydir=0;
		}else if ((key == 'r' || key == 'R') && currentState == GAMEOVER){
			 restartGame();
		}
	}


	public void restartGame(){
		player.x = c.getHeight()/2;
			player.y = c.getHeight()/2;
			score=0;
			snake.clear();
			snake.add(new Snake());
			snake.add(new Snake());
			snake.add(new Snake());
			snake.add(new Snake());
			player.xdir=Snake.SIZE;
			player.ydir=0;
			currentState= INGAME;
	}


	public void updateCanvas(){
		Graphics2D g2= (Graphics2D)strategy.getDrawGraphics();
		g2.setColor(Color.pink);
		g2.fillRect(0,0,c.getWidth(), c.getHeight());
			g2.setColor(Color.red);
			for(int i=0; i<snake.size(); i++){
				g2.fillOval((int)snake.get(i).x-(Snake.SIZE/2),(int)snake.get(i).y-(Snake.SIZE/2),Snake.SIZE,Snake.SIZE);
			}
			g2.setColor(Color.blue);
			g2.fillOval((int)player.x-(Snake.SIZE/2),(int)player.y-(Snake.SIZE/2),Snake.SIZE,Snake.SIZE);
			g2.setColor (Color.black);
			if (currentState == GAMEOVER){
				g2.setColor (Color.blue);
				g2.drawString("Gameover, press 'R' to restart", 405,475);
				g2.drawString("This game was made by Anon", 405,500);
				System.out.println(" ");
				System.out.println("SHAME, You Died");
                System.out.println("Need to code in snake hitting itself");
			}
			g2.setColor(Color.green);
			g2.fillOval((int)fruit.x-(Fruit.SIZE/2),(int)fruit.y-(Fruit.SIZE/2),Fruit.SIZE,Fruit.SIZE);

			g2.setColor(Color.red);
			g2.drawString("Score: " + score, 10,20);
			g2.setColor(Color.yellow);
			g2.drawString("Highscore: " + highscore , 100,20);
			g2.drawString("By: " + playerwithhighscore , 180,20);


		//}
		g2.dispose();
		strategy.show();
		Toolkit.getDefaultToolkit().sync();
		//}
	//}
	}

	class Snake{
		int x=-20,y=-20,xdir=0,ydir=0;
		final static int SIZE=20;
	}

	class Fruit{
		int x=50,y=50,xdir=0,ydir=0;
		final static int SIZE=20;
	}



	class AnimationThread extends Thread{
		SnakeGame at;

		public AnimationThread(SnakeGame _at){
			at=_at;
			start();
		}
  		public void run(){

			int SKIP_TICKS = 1000 / FPS;
			long next_game_tick = System.currentTimeMillis();
			long sleep_time = 0;
			while(true){
				if(animationRunning){
					if(currentState == INGAME){
						updateGame();
						at.updateCanvas();
						next_game_tick += SKIP_TICKS;
						sleep_time = next_game_tick - System.currentTimeMillis();
						if(sleep_time >= 0 ) {
							try{
								sleep(sleep_time);
							}catch(InterruptedException ie){}
							if(player.x >= 950){
								currentState = GAMEOVER;
								player.x = 20;
							}


							System.out.print("Snake: ");
							System.out.print(player.x);
							System.out.print(", ");
							System.out.println(player.y);
							System.out.print("Fruit: ");
							System.out.print(fruit.x);
							System.out.print(", ");
							System.out.println(fruit.y);
							System.out.print("Score");
							System.out.println(score);
						}else{
							next_game_tick = System.currentTimeMillis();
						}
					}
				}
			}
		}
	}
}