java--贪吃蛇-编程知识

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;public class Snake extends JFrame implements KeyListener, ActionListener, MouseListener {int slong = 2;//蛇当前长度//蛇坐标int[] Snakex = new int[100];int[] Snakey = new int[100];int fx = 1;//蛇的方向 0-左 1-右 2-上 3-下Timer timer = new Timer(100, this);//设置定时器，每100毫秒一次//食物位置int foodx;int foody;Random random = new Random();//随机数，随机位置生成食物int started = 0;//游戏信息 0-未开始 1-开始 2-结束//---------------------------------------------------------------------------------------------------------------------//窗体public void myJFrame() {this.setTitle("贪吃蛇"); //标题this.setSize(800, 600); //窗口大小this.setResizable(false); //窗口是否可以改变大小=否this.setDefaultCloseOperation(Snake.EXIT_ON_CLOSE); //窗口关闭方式为关闭窗口同时结束程序int width = Toolkit.getDefaultToolkit().getScreenSize().width; //获取屏幕宽度int height = Toolkit.getDefaultToolkit().getScreenSize().height; //获取屏幕高度
//        System.out.println("宽度："+width);//测试
//        System.out.println("高度："+height);//测试this.setLocation((width - 800) / 2, (height - 600) / 2); //设置窗口默认位置以屏幕居中this.setFocusable(true);this.addKeyListener(this);this.setVisible(true); //窗口是否显示=是//        蛇的初识位置Snakex[0] = 60;Snakey[0] = 100;Snakex[1] = 40;Snakey[1] = 100;//        随机食物的初识位置foodx = random.nextInt(39);foody = random.nextInt(22);foodx = foodx * 20;foody = foody * 20 + 80;System.out.println(foodx + "，" + foody);}//---------------------------------------------------------------------------------------------------------------------//覆写paint方法,绘制界面public void paint(Graphics g) {
//        绘制背景g.setColor(Color.LIGHT_GRAY);g.fillRect(0, 0, 800, 600);//绘制游戏区域g.setColor(Color.black);g.fillRect(0, 80, 800, 520);//绘制蛇for (int i = 0; i < slong; i++) {g.setColor(Color.CYAN);g.fillRect(Snakex[i], Snakey[i], 20, 20);}//        绘制食物g.setColor(Color.yellow);g.fillOval(foodx, foody, 20, 20);if (started == 0) {g.setColor(Color.BLACK);//设置画笔颜色g.setFont(new Font("微软雅黑", 10, 20)); //设置字体g.drawString("按下“空格键”开始游戏", 300, 65); //绘制字符} else if (started == 1) {g.setColor(Color.BLACK);//设置画笔颜色g.setFont(new Font("微软雅黑", 10, 20)); //设置字体g.drawString("当前分数为：", 300, 65); //绘制字符g.drawString(String.valueOf(slong - 2), 420, 65); //绘制字符} else if (started == 2) {g.setColor(Color.BLACK);//设置画笔颜色g.setFont(new Font("微软雅黑", 10, 20)); //设置字体g.drawString("游戏结束-", 250, 65); //绘制字符g.drawString("最终分数为：", 350, 65); //绘制字符g.drawString(String.valueOf(slong - 2), 470, 65); //绘制字符}}//    操作监听——控制蛇的不断移动@Overridepublic void actionPerformed(ActionEvent e) {
//        判断游戏是否开始if (started == 1) {
//            通过循环控制蛇移动for (int i = slong - 1; i > 0; i--) {Snakex[i] = Snakex[i - 1];Snakey[i] = Snakey[i - 1];}//            判断蛇移动的方向if (fx == 0) {Snakex[0] = Snakex[0] - 20;} else if (fx == 1) {Snakex[0] = Snakex[0] + 20;} else if (fx == 2) {Snakey[0] = Snakey[0] - 20;} else if (fx == 3) {Snakey[0] = Snakey[0] + 20;}//            判断蛇是否撞到墙外if (Snakex[0] < 0 || Snakex[0] > 780 || Snakey[0] < 80 || Snakey[0] > 580) {started = 2;}//            判断蛇是否吃到了食物if (Snakex[0] == foodx && Snakey[0] == foody) {slong++;foodx = random.nextInt(39);foody = random.nextInt(22);foodx = foodx * 20;foody = foody * 20 + 80;System.out.println(foodx + "，" + foody);}//            判断是否吃到了自己for (int i = 1; i < slong; i++) {if (Snakex[0] == Snakex[i] && Snakey[0] == Snakey[i]) {started = 2;}}//            判断食物是否随机在了蛇身上for (int i = 0; i < slong; i++) {if (foodx == Snakex[i] && foody == Snakey[i]) {//        随机食物的初识位置foodx = random.nextInt(39);foody = random.nextInt(22);foodx = foodx * 20;foody = foody * 20 + 80;System.out.println(foodx + "，" + foody);}}repaint();}timer.start();}//    输入@Overridepublic void keyTyped(KeyEvent e) {}//    键盘按下——控制游戏的开始以及蛇的移动方向@Overridepublic void keyPressed(KeyEvent e) {
//        获取从键盘输入的键int key = e.getKeyCode();
//        判断是否为空格if (key == KeyEvent.VK_SPACE) {if (started == 0) {started = 1;} else if (started == 1) {started = 0;} else if (started == 2) {started = 0;slong = 2;//蛇当前长度//        蛇的初识位置Snakex[0] = 60;Snakey[0] = 100;Snakex[1] = 40;Snakey[1] = 100;//        随机食物的初识位置foodx = random.nextInt(39);foody = random.nextInt(22);foodx = foodx * 20;foody = foody * 20 + 80;//                初始化方向fx = 1;}repaint();timer.start();//            左} else if (key == KeyEvent.VK_LEFT) {if (fx != 1) {fx = 0;}
//            右} else if (key == KeyEvent.VK_RIGHT) {if (fx != 0) {fx = 1;}
//            上} else if (key == KeyEvent.VK_UP) {if (fx != 3) {fx = 2;}
//下} else if (key == KeyEvent.VK_DOWN) {if (fx != 2) {fx = 3;}}}//    弹起@Overridepublic void keyReleased(KeyEvent e) {}//    点击@Overridepublic void mouseClicked(MouseEvent e) {}//    按下@Overridepublic void mousePressed(MouseEvent e) {}//    抬起@Overridepublic void mouseReleased(MouseEvent e) {}//    进入@Overridepublic void mouseEntered(MouseEvent e) {}//    离开@Overridepublic void mouseExited(MouseEvent e) {}
}