5.2 项目完整源码
5.2.1 Images类
该类为静态类，主要存储贪吃蛇组件的图片对象。
package snakegame; import javax.swing.*; import java.net.URL; //Images类用于封装图片路径以及获取图片（使用静态对象便于用类名直接访问） public class Images { //将图片的路径封装成一个对象 public static URL bodyURL=Images.class.getResource("/snake_images/body.jpg"); public static URL backURL=Images.class.getResource("/snake_images/back.jpg"); public static URL snakeDownURL=Images.class.getResource("/snake_images/snakeDown.jpg"); public static URL snakeLeftURL=Images.class.getResource("/snake_images/snakeLeft.jpg"); public static URL snakeRightURL=Images.class.getResource("/snake_images/snakeRight.jpg"); public static URL snakeUpURL=Images.class.getResource("/snake_images/snakeUp.png"); public static URL foodURL=Images.class.getResource("/snake_images/food.jpg"); //将图片封装为程序中的对象 public static ImageIcon bodyImg=new ImageIcon(bodyURL); public static ImageIcon backImg=new ImageIcon(backURL); public static ImageIcon snakeDownImg=new ImageIcon(snakeDownURL); public static ImageIcon snakeUpImg=new ImageIcon(snakeUpURL); public static ImageIcon snakeRightImg=new ImageIcon(snakeRightURL); public static ImageIcon snakeLeftImg=new ImageIcon(snakeLeftURL); public static ImageIcon foodImg=new ImageIcon(foodURL); }
5.2.2 HighestScore
该类实现历史最高分功能。
package snakegame; import org.w3c.dom.Text; import java.io.*; //该类用于给游戏添加历史最高分功能 public class HighestScore { static int score = 0;//最高分的存储 public void highest() throws IOException { //得分为最高分时存储 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(String.valueOf(Text.class.getResourceAsStream("贪吃蛇大作战/score.txt")))); if (GamePanel.score > score) { score = GamePanel.score; String s1 = String.valueOf(score); bos.write(s1.getBytes()); } bos.close(); } //用于游戏开始时从文件读取最高分的值 public void readHighest() throws IOException { BufferedInputStream bis = new BufferedInputStream(new FileInputStream(String.valueOf(Text.class.getResourceAsStream("贪吃蛇大作战/score.txt")))); byte[] bys = new byte[1024]; int len; while ((len = bis.read(bys)) != -1) { System.out.print(new String(bys, 0, len));//测试用 String s2 = new String(bys, 0, len); score = Integer.valueOf(s2); } bis.close(); } }
5.2.3 GamePanel类
该类用于绘制贪吃蛇游戏面板，以及实现游戏具体逻辑功能。
package snakegame; import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.io.IOException; import java.util.Random; //贪吃蛇游戏面板的绘制 public class GamePanel extends JPanel { Timer timer; int time=100; static int score;//记录游戏分数 //蛇属性部分 boolean isDied; int length;//设置蛇长 String direction;//蛇头朝向 //分别储存蛇身的X，Y坐标 int[] snakeX=new int[300]; int[] snakeY=new int[300]; //判断游戏是否开始 boolean isStart=false; int foodX,foodY;//食物的X，Y坐标 //贪吃蛇初始化方法 public void init(){ length=3; snakeX[0]=175; snakeY[0]=275; snakeX[1]=150; snakeY[1]=275; snakeX[2]=125; snakeY[2]=275; foodX=300; foodY=400; score=0; isDied=false;//蛇默认状态为活着 direction="R";//U,D,L,R分别表示蛇头朝向上，下，左，右 } //构造方法 public GamePanel() throws IOException { init(); if(GamePanel.score>HighestScore.score){ new HighestScore().highest(); } //焦点定位到当前面板 this.setFocusable(true); //监听器的实现部分 this.addKeyListener(new KeyAdapter() { @Override public void keyPressed(KeyEvent e) { super.keyPressed(e); int keyCode = e.getKeyCode(); //按下空格以开始游戏，以及方向键的控制 if (keyCode == KeyEvent.VK_SPACE) { if(isDied){ init(); }else { isStart = !isStart; repaint();//重绘 } } else if (keyCode == KeyEvent.VK_UP || keyCode == KeyEvent.VK_W) { direction = "U"; } else if (keyCode == KeyEvent.VK_DOWN || keyCode == KeyEvent.VK_S) { direction = "D"; } else if (keyCode == KeyEvent.VK_LEFT || keyCode == KeyEvent.VK_A) { direction = "L"; } else if (keyCode == KeyEvent.VK_RIGHT || keyCode == KeyEvent.VK_D) { direction = "R"; } } }); //贪吃蛇加速功能的实现 this.addKeyListener(new KeyAdapter() { @Override public void keyPressed(KeyEvent e) { int keyCode=e.getKeyCode(); if(keyCode==KeyEvent.VK_F){ time=10; timer.setDelay(time);//按下F时加速 } } @Override public void keyReleased(KeyEvent e) { int keyCode=e.getKeyCode(); if(keyCode==KeyEvent.VK_F){ time=100; timer.setDelay(time);//松开F键减速恢复默认速度 } } }); //对定时器进行初始化，并实现监听器 timer = new Timer(time, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { //当游戏处于开始状态且蛇活着时蛇活动，且后一节身子到前一节身子的位置上（每一节身子为25乘25像素） if (isStart && isDied == false) { //蛇身运动部分 for (int i = length - 1; i > 0; i--) { snakeX[i] = snakeX[i - 1]; snakeY[i] = snakeY[i - 1]; } //蛇头运动部分 if ("D".equals(direction)) { snakeY[0] += 25; } if ("U".equals(direction)) { snakeY[0] -= 25; } if ("L".equals(direction)) { snakeX[0] -= 25; } if ("R".equals(direction)) { snakeX[0] += 25; } //防止超出边界 if (snakeX[0] > 750) { snakeX[0] = 25; } if (snakeX[0] < 25) { snakeX[0] = 750; } if (snakeY[0] < 100) { snakeY[0] = 725; } if (snakeY[0] > 725) { snakeY[0] = 100; } //吃食物的动作,吃食物加10分且蛇身变长,蛇的速度提升10 if ((snakeX[0] == foodX && snakeY[0] == foodY)) { length++;//蛇身长度加1 foodX = (new Random().nextInt(30) + 1) * 25;//随机生成X坐标[25,750] foodY = (new Random().nextInt(26) + 4) * 25;//随机生成Y坐标[100,725] score += 10;//吃一次食物积分加10 try { new HighestScore().highest(); } catch (IOException ioException) { ioException.printStackTrace(); } if(time>10) timer.setDelay(time-=10);//吃一次食物速度增加10 } //蛇的死亡机制判定 for (int i = 1; i < length; i++) { if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]) { isDied = !isDied; } } repaint(); } } }); timer.start();//定时器启动 } //绘制面板部分 @Override protected void paintComponent(Graphics g) { super.paintComponent(g); //填充背景颜色 this.setBackground(new Color(164, 219, 246)); //绘制初始蛇头的图片（默认右方朝向） Images.backImg.paintIcon(this,g,10,10); //调整画笔的颜色并绘制一个矩形面板 g.setColor(new Color(219,226,219)); g.fillRect(10,70,770,685); //蛇头的绘制;上下左右不同情况 if("L".equals(direction)){ Images.snakeLeftImg.paintIcon(this,g,snakeX[0],snakeY[0]); } if("R".equals(direction)){ Images.snakeRightImg.paintIcon(this,g,snakeX[0],snakeY[0]); } if("U".equals(direction)){ Images.snakeUpImg.paintIcon(this,g,snakeX[0],snakeY[0]); } if("D".equals(direction)){ Images.snakeDownImg.paintIcon(this,g,snakeX[0],snakeY[0]); } //蛇身的绘制 for(int i=1;i<length;i++) { Images.bodyImg.paintIcon(this, g, snakeX[i], snakeY[i]); } //食物绘制 Images.foodImg.paintIcon(this,g,foodX,foodY); //游戏的文字提示语 if(!isStart&&!isDied){ g.setColor(new Color(12, 191, 222)); g.setFont(new Font("楷体",Font.BOLD,40)); g.drawString("轻按空格以开始/暂停游戏！",150,330); g.setColor(new Color(246, 2, 31)); g.setFont(new Font("宋体",Font.CENTER_BASELINE,30)); g.drawString("按住F以加速",300,380); } //游戏的得分显示 g.setColor(new Color(248, 4, 74)); g.setFont(new Font("楷体",Font.BOLD,30)); g.drawString("得分:"+score,420,90); //游戏的最高分展示模块 try { new HighestScore().readHighest(); } catch (IOException e) { e.printStackTrace(); } g.setColor(new Color(183, 25, 238)); g.setFont(new Font("楷体",Font.BOLD,30)); g.drawString("历史最高分:"+HighestScore.score,10,90); //蛇的速度提示 g.setColor(new Color(248, 136, 36)); g.setFont(new Font("楷体",Font.BOLD,30)); g.drawString("当前速度:"+String.valueOf(110-time),550,90); //游戏的奖励鼓励机制 if(score==10){ g.setColor(new Color(127, 232, 20)); g.setFont(new Font("微软雅黑",Font.BOLD,50)); g.drawString("Good!",snakeX[0],snakeY[0]); } else if(score==50){ g.setColor(new Color(17, 231, 250)); g.setFont(new Font("微软雅黑",Font.BOLD,50)); g.drawString("Good!!!",snakeX[0],snakeY[0]); }else if(score==100){ g.setColor(new Color(248, 196, 6)); g.setFont(new Font("微软雅黑",Font.BOLD,50)); g.drawString("Perfect!!!",snakeX[0],snakeY[0]); }else if(score==200){ g.setColor(new Color(248, 245, 26)); g.setFont(new Font("微软雅黑",Font.BOLD,50)); g.drawString("无人能挡!!!",snakeX[0],snakeY[0]); } //小蛇死亡时面板的绘制 if(isDied){ g.setColor(new Color(6, 115, 248)); g.setFont(new Font("微软雅黑",Font.BOLD,30)); g.drawString("你的小蛇已经死亡，按下空格重新开始！",170,330); } } }
5.2.4 Start类
页面的总体布局与程序的入口。
package snakegame; import javax.swing.*; import java.awt.*; import java.io.IOException; //贪吃蛇总体界面布局以及程序的主方法 public class Start { public static void main(String[] args) throws IOException { JFrame jf=new JFrame("贪吃蛇"); //获取屏幕的大小，并使用数据使窗口位置居中 int width= Toolkit.getDefaultToolkit().getScreenSize().width; int height= Toolkit.getDefaultToolkit().getScreenSize().height; jf.setBounds((width-800)/2,(height-800)/2,800,800); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setResizable(false);//设置窗口大小不能更改 //添加GamePanel面板 GamePanel panel=new GamePanel(); jf.add(panel); jf.setVisible(true); } }
