I don't undestand where the "newHead" should be created and how it affects the existing code, created in the previous tasks.
package com.codegym.task.task23.task2312;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
/**
* The program's main class.
*/
public class Room {
private int width;
private int height;
private Snake snake;
private Mouse mouse;
public Room(int width, int height, Snake snake) {
this.width = width;
this.height = height;
this.snake = snake;
game = this;
}
public Snake getSnake() {
return snake;
}
public Mouse getMouse() {
return mouse;
}
public int getWidth() {
return width;
}
public int getHeight() {
return height;
}
public void setWidth(int width) {
this.width = width;
}
public void setHeight(int height) {
this.height = height;
}
public void setSnake(Snake snake) {
this.snake = snake;
}
public void setMouse(Mouse mouse) {
this.mouse = mouse;
}
/**
* The program's main loop.
* This is where all the important actions happen.
*/
public void run() {
// Create a KeyboardObserver object and start it.
KeyboardObserver keyboardObserver = new KeyboardObserver();
keyboardObserver.start();
// As long as the snake is alive
while (snake.isAlive()) {
// Does the observer have any key events?
if (keyboardObserver.hasKeyEvents()) {
KeyEvent event = keyboardObserver.getEventFromTop();
// If 'q', then exit the game.
if (event.getKeyChar() == 'q') return;
// If "left arrow", then move the figure to the left
if (event.getKeyCode() == KeyEvent.VK_LEFT)
snake.setDirection(SnakeDirection.LEFT);
// If "right arrow", then move the figure to the right
else if (event.getKeyCode() == KeyEvent.VK_RIGHT)
snake.setDirection(SnakeDirection.RIGHT);
// If "up arrow", then move the figure up
else if (event.getKeyCode() == KeyEvent.VK_UP)
snake.setDirection(SnakeDirection.UP);
// If "down arrow", then move the figure down
else if (event.getKeyCode() == KeyEvent.VK_DOWN)
snake.setDirection(SnakeDirection.DOWN);
}
snake.move(); // Move the snake
print(); // Display the current game state
sleep(); // Pause between moves
}
// Display "Game Over"
System.out.println("Game Over!");
}
/**
* Display the current game state on the screen
*/
public void print() {
// Create an array where we will "draw" the current game state
int[][] matrix = new int[height][width];
// Draw all the parts of the snake
ArrayList<SnakeSection> sections = new ArrayList<SnakeSection>(snake.getSections());
for (SnakeSection snakeSection : sections) {
matrix[snakeSection.getY()][snakeSection.getX()] = 1;
}
// Draw the head of the snake (4 - if the snake is dead)
matrix[snake.getY()][snake.getX()] = snake.isAlive() ? 2 : 4;
// Draw the mouse
matrix[mouse.getY()][mouse.getX()] = 3;
// Display it all on the screen
String[] symbols = {" . ", " x ", " X ", "^_^", "RIP"};
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
System.out.print(symbols[matrix[y][x]]);
}
System.out.println();
}
System.out.println();
System.out.println();
System.out.println();
}
/**
* This method is called when the mouse is eaten
*/
public void eatMouse() {
createMouse();
}
/**
* Create a new mouse
*/
public void createMouse() {
int x = (int) (Math.random() * width);
int y = (int) (Math.random() * height);
mouse = new Mouse(x, y);
}
public static Room game;
public static void main(String[] args) {
game = new Room(20, 20, new Snake(10, 10));
game.snake.setDirection(SnakeDirection.DOWN);
game.createMouse();
game.run();
}
private int initialDelay = 520;
private int delayStep = 20;
/**
* The programmer pauses. The length of the pause depends on the length of the snake.
*/
public void sleep() {
try {
int level = snake.getSections().size();
int delay = level < 15 ? (initialDelay - delayStep * level) : 200;
Thread.sleep(delay);
} catch (InterruptedException e) {
}
}
}