Question

java中的贪吃蛇程序

最上面画圈的变量都是什么意思？如何判断蛇是否撞到墙或自己的？





Answer 1

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class SnakeGame extends JFrame implements KeyListener{
private int stat=1,direction=0,bodylen=6,headx=7,heady=8,
tailx=1,taily=8,tail,foodx,foody,food;//初始化定义变量
public final int EAST=1,WEST=2,SOUTH=3,NORTH=4;//方向常量
int [][] fillblock=new int [20][20];//定义蛇身所占位置
public SnakeGame() {//构造函数
super("贪吃蛇");
setSize(510,510);
setVisible(true);//设定窗口属性
addKeyListener(this);//添加监听
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
for(int i=1;i<=7;i++) fillblock[i][8]=EAST;//初始化蛇身属性
direction=EAST;//方向初始化的设置
FoodLocate(); //定位食物
while (stat==1){
fillblock[headx][heady]=direction;
switch(direction){
case 1:headx++;break;
case 2:headx--;break;
case 3:heady++;break;
case 4:heady--;break;
}//蛇头的前进
if(heady>19||headx>19||tailx>19||taily>19||heady<0||headx<0||tailx<0||taily<0||fillblock[headx][heady]!=0){
stat=0;
break;
} //判断游戏是否结束
try{
Thread.sleep(150); }
catch(InterruptedException e){}//延迟
fillblock[headx][heady]=direction;
if(headx==foodx&&heady==foody){//吃到食物
FoodLocate();
food=2;
try{
Thread.sleep(100); }
catch(InterruptedException e){}//延迟
}
if(food!=0)food--;
else{tail=fillblock[tailx][taily];
fillblock[tailx][taily]=0;//蛇尾的消除
switch(tail){
case 1:tailx++;break;
case 2:tailx--;break;
case 3:taily++;break;
case 4:taily--;break;
}//蛇尾的前进
}
repaint();
}
if(stat==0)
JOptionPane.showMessageDialog(null,"GAME OVER","Game Over",JOptionPane.INFORMATION_MESSAGE);
}
public void keyPressed(KeyEvent e) {//按键响应
int keyCode=e.getKeyCode();
if(stat==1) switch(keyCode){
case KeyEvent.VK_UP:if(direction!=SOUTH) direction=NORTH;break;
case KeyEvent.VK_DOWN:if(direction!=NORTH)direction=SOUTH;break;
case KeyEvent.VK_LEFT:if(direction!=EAST)direction=WEST;break;
case KeyEvent.VK_RIGHT:if (direction!=WEST)direction=EAST;break;
}
}
public void keyReleased(KeyEvent e){}//空函数
public void keyTyped(KeyEvent e){} //空函数
public void FoodLocate(){//定位食物坐标
do{
Random r=new Random();
foodx=r.nextInt(20);
foody=r.nextInt(20);
}while (fillblock[foodx][foody]!=0);
}
public void paint(Graphics g){//画图
super.paint(g);
g.setColor(Color.BLUE);
for(int i=0;i<20;i++)
for(int j=0;j<20;j++)
if (fillblock[i][j]!=0)
g.fillRect(25*i+5,25*j+5,24,24);
g.setColor(Color.RED);
g.fillRect(foodx*25+5,foody*25+5,24,24);
}
public static void main(String[] args) {//主程序
SnakeGame application=new SnakeGame();
}
}

Answer 2

主要用了javax.swing.Timer这个类:

import java.awt.*;
import javax.swing.*;

@SuppressWarnings("serial")
public class MainClass extends JFrame {
ControlSnake control;

Toolkit kit;

Dimension dimen;

public static void main(String[] args) {
new MainClass("my snake");
}

public MainClass(String s) {
super(s);
control = new ControlSnake();
control.setFocusable(true);
kit = Toolkit.getDefaultToolkit();
dimen = kit.getScreenSize();

add(control);
setLayout(new BorderLayout());
setLocation(dimen.width / 3, dimen.height / 3);// dimen.width/3,dimen.height/3
setSize(FWIDTH, FHEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
setVisible(true);
}

public static final int FWIDTH = 315;

public static final int FHEIGHT = 380;
}

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.Timer;
import java.util.Random;

@SuppressWarnings("serial")
public class ControlSnake extends JPanel implements ActionListener {
Random rand;

ArrayList<Point> list, listBody;

String str, str1;

static boolean key;

int x, y, dx, dy, fx, fy, flag;

int snakeBody;

int speed;

public ControlSnake() {
snakeBody = 1;

str = "上下左右方向键控制 P键暂停...";
str1 = "现在的长度为:" + snakeBody;
key = true;
flag = 1;

speed = 700;
rand = new Random();
list = new ArrayList<Point>();
listBody = new ArrayList<Point>();

x = 5;
y = 5;
list.add(new Point(x, y));
listBody.add(list.get(0));

dx = 10;
dy = 0;

fx = rand.nextInt(30) * 10 + 5;// 2
fy = rand.nextInt(30) * 10 + 5;// 2

setBackground(Color.WHITE);
setSize(new Dimension(318, 380));

final Timer time = new Timer(speed, this);
time.start();

addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 37) {
dx = -10;
dy = 0;
} else if (e.getKeyCode() == 38) {
dx = 0;
dy = -10;
} else if (e.getKeyCode() == 39) {
dx = 10;
dy = 0;
} else if (e.getKeyCode() == 40) {
dx = 0;
dy = 10;
} else if (e.getKeyCode() == 80) {
if (flag % 2 == 1) {
time.stop();
}
if (flag % 2 == 0) {
time.start();
}
flag++;
}
}
});

}

Answer 3

xy就是坐标边界 超了就结束了

追问

z,growth,time是什么意思