Page 2 - Snake Game

for (int i = snake.size() - 1; i > 0; i--) {

/* something to make a specific index of the snake take the spot 
of the one preceding it, so I know that for the left and right commands it will 
somehow involve snake.some method or code.x = snake.some method or code.x + 1 */

}

 public void initGame() {
		snake = new ArrayList<Coordinate>();
		snake.add(new Coordinate (15,15));
		snake.add(new Coordinate (14,15));
		snake.add(new Coordinate (13,15));
		snake.add(new Coordinate (12,15));
		snake.add(new Coordinate (11,15));
		
		board.updateSnake(snake);
		
		timer = new Timer(DELAY, this);
		timer.start();
		growCounter = 0;
		moveCounter = 0;
		
		left = false;
		right = true;
		up = false;
		down = false;		
	} 

import java.util.*;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;

import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
 * The main game class that reads user input,
 * maintains a snake and updates game board
 * 
 *
 **/
public class MainGame implements ActionListener {

	// size of the game board (30 * 30 by default)
	private final int WIDTH = 30;
	private final int HEIGHT = 30;
	
	private final int Init_Snake_Length = 5;
	
	// delay of detecting user input ( in milliseconds )
	private final int DELAY = 100;
	
	// grow the snake every GROWTH_INTERVAL milliseconds
	private final int GROWTH_INTERVAL = 5000;
	// move the snake every MOVE_INTERVAL milliseconds
	private final int MOVE_INTERVAL = 500;
	
	// The snake (as a list of coordinates in the 2D board array)
	private ArrayList<Coordinate> snake;
	
	// The game board object - read GameBoard.java
	private GameBoard board; 
	
	// Flag variables indicating which direction is chosen
	// by user. Only one of the four can be true at any moment
	private boolean left = false;
	private boolean right = true;
	private boolean up = false;
	private boolean down = false;

	private Timer timer;
	private long growCounter;
	private long moveCounter;
	
	public MainGame() {
		board = new GameBoard(WIDTH, HEIGHT);
		initGame();
		board.addKeyListener(new TAdapter());
	}
	
	public static void main(String[] argv) {
		MainGame mg = new MainGame();
	}
	
	public void initGame() {
		snake = new ArrayList<Coordinate>();
		snake.add(new Coordinate (15,15)); //head
		snake.add(new Coordinate (14,15)); // upper body
		snake.add(new Coordinate (13,15)); // middle body
		snake.add(new Coordinate (12,15)); // lower body
		snake.add(new Coordinate (11,15)); // tail
		
		board.updateSnake(snake);
		
		timer = new Timer(DELAY, this);
		timer.start();
		growCounter = 0;
		moveCounter = 0;
		
		left = false;
		right = true;
		up = false;
		down = false;		
	}
	
	private void moveSnake() 
	{
		
		if (right == true) 
		{
			snake.get(0).x = snake.get(0).x + 1;
			for (int i = 1; i < snake.size() -1; i++) 
			{
				snake.get(i).x = snake.get(i+1).x;
			}
		}
		
		if (left == true) 
		{
			snake.get(0).x = snake.get(0).x - 1;
			for (int i = 1; i < snake.size() -1; i++) 
			{
				snake.get(i).x = snake.get(i+1).x;
			}
		}
			
		if (up == true) 
		{	
			snake.get(0).y = snake.get(0).y - 1;
			for (int i = 1; i < snake.size() -1; i++) 
			{
				snake.get(i).y = snake.get(i+1).y;
			}
		}

		
		if (down == true) 
		{
			snake.get(0).y = snake.get(0).y + 1;
			for (int i = 1; i < snake.size() -1; i++) 
			{
				
				snake.get(i).y = snake.get(i+1).y;
			}
		}
		}
				

		// -------------------------------------------------------------
		// Task 2: Move the snake by updating the list of coordinates properly
		// The direction to move to is given by the four flag variables (left, right, up, down)
		//

		
		// Task 2 end
		//--------------------------------------------------------------

		
	
	private void growSnake() {
		// -------------------------------------------------------------
		// Task 3: Grow the snake by updating the list of coordinates properly
		//

		
		
		// Task 3 end
		//--------------------------------------------------------------
	}


	private void checkCollision() {
		boolean collision = false;
		
		// -------------------------------------------------------------
		// Task 4: Insert code here to detect collision
		//

		
		
		// Task 4 end
		//--------------------------------------------------------------		
		
		
		if (collision) {
			gameOver();
		}
	}
	
	private void gameOver() {
		JOptionPane.showMessageDialog(board, "Game Over");
		System.exit(0);
	}
	
	/**
	 * The actions to be performed every DELAY milliseconds
	 */
	public void actionPerformed(ActionEvent e) {
		
		if ( ++growCounter * DELAY >= GROWTH_INTERVAL) {
			growSnake();
			growCounter = 0;
		} 
		if ( ++moveCounter * DELAY >= MOVE_INTERVAL) {
			moveSnake();
			moveCounter = 0;
		}

		checkCollision();
		board.resetBoard();
		board.updateSnake(snake);
		board.repaint();

	}


	/**
	 * A key listener class for reading user's input.
	 * 
	 *
	 */
	private class TAdapter extends KeyAdapter {

		public void keyPressed(KeyEvent e) {

			int key = e.getKeyCode();

			if ((key == KeyEvent.VK_LEFT) && (!right)) {
				left = true;
				up = false;
				down = false;
			}

			if ((key == KeyEvent.VK_RIGHT) && (!left)) {
				right = true;
				up = false;
				down = false;
			}

			if ((key == KeyEvent.VK_UP) && (!down)) {
				up = true;
				right = false;
				left = false;
			}

			if ((key == KeyEvent.VK_DOWN) && (!up)) {
				down = true;
				right = false;
				left = false;
			}
		}
	}
} 

for (int i = 1; i < snake.size() -1; i++) 
{
	snake.get(i).x = snake.get(i+1).x;
}