SnakeGame.java - master - rod-pis/Snake-for-Java

SnakeGame.java
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rod-pis
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15 дек 2025, 18:34
15 дек 2025, 18:34ed3af57
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;

public class SnakeGame extends JPanel implements ActionListener {

    private final int TILE_SIZE = 25;
    private final int WIDTH = 20;
    private final int HEIGHT = 20;
    private final int DELAY = 150;

    private final int[] x = new int[WIDTH * HEIGHT];
    private final int[] y = new int[WIDTH * HEIGHT];
    private int snakeLength = 3;

    private int foodX;
    private int foodY;

    private char direction = 'R';
    private boolean running = true;

    private Timer timer;
    private Random random;

    public SnakeGame() {
        setPreferredSize(new Dimension(WIDTH * TILE_SIZE, HEIGHT * TILE_SIZE));
        setBackground(Color.BLACK);
        setFocusable(true);
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                switch (e.getKeyCode()) {
                    case KeyEvent.VK_LEFT:
                        if (direction != 'R') direction = 'L';
                        break;
                    case KeyEvent.VK_RIGHT:
                        if (direction != 'L') direction = 'R';
                        break;
                    case KeyEvent.VK_UP:
                        if (direction != 'D') direction = 'U';
                        break;
                    case KeyEvent.VK_DOWN:
                        if (direction != 'U') direction = 'D';
                        break;
                }
            }
        });

        random = new Random();
        spawnFood();
        timer = new Timer(DELAY, this);
        timer.start();
    }

    private void spawnFood() {
        foodX = random.nextInt(WIDTH);
        foodY = random.nextInt(HEIGHT);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        if (running) {
            g.setColor(Color.RED);
            g.fillRect(foodX * TILE_SIZE, foodY * TILE_SIZE, TILE_SIZE, TILE_SIZE);

            for (int i = 0; i < snakeLength; i++) {
                if (i == 0) g.setColor(Color.GREEN);
                else g.setColor(Color.YELLOW);
                g.fillRect(x[i] * TILE_SIZE, y[i] * TILE_SIZE, TILE_SIZE, TILE_SIZE);
            }
        } else {
            g.setColor(Color.WHITE);
            g.setFont(new Font("Arial", Font.BOLD, 40));
            g.drawString("Game Over", 50, HEIGHT * TILE_SIZE / 2);
        }
    }

    private void move() {
        for (int i = snakeLength; i > 0; i--) {
            x[i] = x[i - 1];
            y[i] = y[i - 1];
        }

        switch (direction) {
            case 'U' -> y[0]--;
            case 'D' -> y[0]++;
            case 'L' -> x[0]--;
            case 'R' -> x[0]++;
        }
    }

    private void checkFood() {
        if (x[0] == foodX && y[0] == foodY) {
            snakeLength++;
            spawnFood();
        }
    }

    private void checkCollisions() {
        for (int i = snakeLength; i > 0; i--) {
            if (x[0] == x[i] && y[0] == y[i]) running = false;
        }
        if (x[0] < 0 || x[0] >= WIDTH || y[0] < 0 || y[0] >= HEIGHT) running = false;
        if (!running) timer.stop();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (running) {
            move();
            checkFood();
            checkCollisions();
        }
        repaint();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Snake Game");
        SnakeGame gamePanel = new SnakeGame();
        frame.add(gamePanel);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}