第十一次实验课代码

添加C08~C011

C08-SnackGame/C08-SnackGame.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

C08-SnackGame/src/game/Direction.java

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+package game;
+
+import java.awt.*;
+
+public enum Direction {
+    UP(new Point(0,-1)),
+    DOWN(new Point(0,1)),
+    LEFT(new Point(-1,0)),
+    RIGHT(new Point(1,0));
+    private Point offset;
+    Direction(Point offset) {
+        this.offset = offset;
+    }
+    public static Point getOffset(Direction dir) {
+        return dir.offset;
+    }
+}

C08-SnackGame/src/game/Drawable.java

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+package game;
+
+import java.awt.*;
+
+public interface Drawable {
+    void draw(Graphics g);
+}

C08-SnackGame/src/game/Food.java

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+package game;
+
+import java.awt.*;
+import java.util.Random;
+
+public class Food extends GameElement{
+    private  static Random randeom = new Random();
+    public Food(int width,int height) {
+        super(0,0);
+        randomPosition(width,height);
+    }
+
+    /**
+     * 随机设置位置坐标
+     * @param width 可用宽度范围
+     * @param height 可用高度范围
+     */
+    public void randomPosition(int width, int height) {
+        //计算一排或一列最多的格子数
+        int maxX = width/SIZE;
+        int maxY = height/SIZE;
+        //将位置坐标映射到像素点
+        int x = randeom.nextInt(maxX)*SIZE;
+        int y = randeom.nextInt(maxY)*SIZE;
+        //设置坐标
+        position.setLocation(x,y);
+    }
+    @Override
+    public void draw(Graphics g) {
+        //红色填充，黑色边框
+        g.setColor(Color.RED);
+        g.fillOval(position.x,position.y,SIZE,SIZE);
+
+        g.setColor(Color.BLACK);
+        g.drawOval(position.x,position.y,SIZE,SIZE);
+    }
+
+}

C08-SnackGame/src/game/GameElement.java

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+package game;
+
+import java.awt.*;
+
+public abstract class GameElement {
+    protected Point position;
+    public static final int SIZE = 20;
+    protected GameElement(int x,int y) {
+        position = new Point(x,y);
+    }
+    public Point getPosition() {
+        return position;
+    }
+    public abstract void draw(Graphics g);
+}

C08-SnackGame/src/game/Movable.java

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+package game;
+
+public interface Movable {
+    void move();
+}

C08-SnackGame/src/game/SnakeNode.java

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+package game;
+
+import java.awt.*;
+
+public class SnakeNode extends GameElement implements Movable{
+    private Direction direction;
+    public SnakeNode(int x, int y, Direction direction) {
+        super(x, y);
+        this.direction = direction;
+    }
+    public void setDirection(Direction direction) {
+        this.direction = direction;
+    }
+
+    @Override
+    public void draw(Graphics g) {
+        //绿色填充，黑色边框
+        g.setColor(Color.GREEN);
+        g.fillRect(position.x, position.y, SIZE, SIZE);
+        // 绘制边框，让蛇身更清晰
+        g.setColor(Color.BLACK);
+        g.drawRect(position.x, position.y, SIZE, SIZE);
+    }
+
+    @Override
+    public void move() {
+        Point offset = Direction.getOffset(direction);
+        position.x += offset.x*SIZE;
+        position.y += offset.y*SIZE;
+    }
+}

C08-SnackGame/src/view/GamePanel.java

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+package view;
+
+import game.Direction;
+import game.Food;
+import game.SnakeNode;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+
+
+public class GamePanel extends JPanel {
+    private static final int WIDTH = 600;
+    private static final int HEIGHT = 600;
+    private boolean isRunning;
+    // FIXME 蛇身体节点 未来需要改进
+    private SnakeNode[] snakeBody = new SnakeNode[3];
+    private final Food food;
+
+
+    public GamePanel() {
+        setPreferredSize(new Dimension(WIDTH, HEIGHT));
+        setBackground(Color.WHITE); // 背景色设为白色
+
+        // FIXME 初始化蛇 未来需要改进
+        snakeBody[0] = new SnakeNode(100, 100, Direction.RIGHT);
+        snakeBody[1] = new SnakeNode(80, 100, Direction.RIGHT);
+        snakeBody[2] = new SnakeNode(60, 100, Direction.RIGHT);
+
+        food = new Food(WIDTH, HEIGHT);
+
+
+        // 键盘监听
+        addKeyListener(new KeyAdapter() {
+            @Override
+            public void keyPressed(KeyEvent e) {
+                // TODO 按下按键后需要做处理
+            }
+        });
+        setFocusable(true); // 确保面板能接收键盘事件
+
+        // 游戏循环
+        new Thread(() -> {
+            while (isRunning) {
+                try {
+                    Thread.sleep(250);
+                    moveSnake(); // 移动蛇
+                    checkCollision(); // 检查碰撞
+                    repaint(); // 调用paintComponent重绘
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        }).start();
+    }
+
+    private void moveSnake() {
+        // TODO
+    }
+
+    private void checkCollision() {
+        // TODO
+    }
+
+    private void gameOver() {
+        isRunning = false;
+        JOptionPane.showMessageDialog(this, "游戏结束！得分：");
+        System.exit(0);
+    }
+
+    // 核心改进：重写paintComponent而非paint，利用Swing双缓冲
+    @Override
+    protected void paintComponent(Graphics g) {
+        super.paintComponent(g); // 先绘制背景（双缓冲关键步骤）
+
+        // 绘制蛇
+        for (SnakeNode node : snakeBody) {
+            node.draw(g);
+        }
+
+        // 绘制食物
+        food.draw(g);
+    }
+}

C08-SnackGame/src/view/SnakeGame.java

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+package view;
+
+import javax.swing.*;
+
+public class SnakeGame extends JFrame {
+    public SnakeGame() {
+        setTitle("贪吃蛇");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        add(new GamePanel()); // 添加游戏面板
+        pack(); // 自动调整窗口大小以适应面板
+        setLocationRelativeTo(null); // 窗口居中
+        setVisible(true);
+    }
+
+    public static void main(String[] args) {
+        new SnakeGame();
+    }
+}