ADD file via upload

GamePanel.java

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+package com.uyong.study.snake;
+
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+
+import javax.swing.BorderFactory;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.Timer;
+
+public class GamePanel extends JPanel {
+
+	private static final long serialVersionUID = 1L;
+
+	private Snake snake;
+	private Food food;
+	private Timer timer;
+	private int score;// 分数
+	private int length;// 蛇身长度
+	private int speed;// 速度
+
+	public GamePanel() {
+		snake = new Snake();
+		food = new Food();
+		speed = 200;
+		timer = new Timer(speed, new SnakeRunListerner());
+
+		setSize(SizeConstants.WIDTH * SizeConstants.SIZE, SizeConstants.HEIGHT * SizeConstants.SIZE);
+		setBorder(BorderFactory.createEtchedBorder(Color.RED, Color.RED));
+		addKeyListener(new KeyControl());
+	}
+
+	// 开始游戏
+	public void startGame() {
+		score = 0;
+		length = snake.getSnakeBody().size();
+		timer.start();
+	}
+
+	// 暂停
+	public void stop() {
+		if (timer.isRunning()) {
+			timer.stop();
+		} else {
+			timer.start();
+		}
+	}
+
+	// 重新开始
+	public void againStart() {
+		repaint();
+		snake.againStart();
+		speed = 200;
+		startGame();
+	}
+
+	// 当吃到食物后产生新食物
+	public void eatFood() {
+		if (snake.isEatFood(food)) {
+			addSpeed();
+			timer.setDelay(speed);
+			countScore();
+			countLength();
+			snake.eatFood();
+			snake.setColor(food.getColor());
+			food.changeColor();
+			food.createFood(snake);
+		}
+	}
+
+	// 游戏结束后的选择
+	public void gameEnd() {
+		if (!snake.getLife()) {
+
+			int option = JOptionPane.showConfirmDialog(null, "是否继续?", "游戏已结束", JOptionPane.YES_NO_OPTION);
+			if (option == JOptionPane.YES_OPTION) {
+				speed = 200;
+				againStart();
+			} else {
+				System.exit(0);
+			}
+		}
+	}
+
+	// 速度增长比例
+	public void addSpeed() {
+		speed = speed - 5;
+	}
+
+	// 分数计算
+	public void countScore() {
+		score = score + 2 * (length - 2);
+	}
+
+	// 长度计算
+	public void countLength() {
+		length++;
+	}
+
+	public int getScore() {
+		return score;
+	}
+
+	public int getLength() {
+		return length;
+	}
+
+	public int getSpeed() {
+		return speed;
+	}
+
+	public void setSpeed(int speed) {
+		this.speed = speed;
+	}
+
+	@Override
+	public void paintComponent(Graphics g) {
+		super.paintComponent(g);
+		g.setColor(getBackground());
+		g.fillRect(1, 1, SizeConstants.WIDTH * SizeConstants.SIZE, SizeConstants.HEIGHT * SizeConstants.SIZE);
+		snake.drawSnake(g);
+		food.drawFood(g);
+		eatFood();
+	}
+
+	private class SnakeRunListerner implements ActionListener {
+		@Override
+		public void actionPerformed(ActionEvent e) {
+			if (e.getSource() == timer) {
+				if (snake.getLife()) {
+					snake.snakeMove();
+					gameEnd();
+					repaint();
+				}
+			}
+		}
+	}
+
+	private class KeyControl extends KeyAdapter {
+		@Override
+		public void keyPressed(KeyEvent e) {
+			int key = e.getKeyCode();
+			switch (key) {
+			case KeyEvent.VK_UP:
+				snake.changeDeriction(snake.UP);
+				break;
+			case KeyEvent.VK_DOWN:
+				snake.changeDeriction(snake.DOWN);
+				break;
+			case KeyEvent.VK_LEFT:
+				snake.changeDeriction(snake.LEFT);
+				break;
+			case KeyEvent.VK_RIGHT:
+				snake.changeDeriction(snake.RIGHT);
+				break;
+			}
+		}
+	}
+}