本人做了些修改
修正如下：
1、修正了按键与行进方向相反而死的bug
2、修正了连续按键可以加速的bug
GreedySnake.java
- package com.fred.test;
- import java.awt.event.KeyListener;
- import java.awt.event.KeyEvent;
- import java.awt.Graphics;
- import java.awt.Point;
- import java.awt.Color;
- import java.util.Random;
- import java.util.List;
- import java.util.LinkedList;
- import javax.swing.JPanel;
- import javax.swing.JFrame;
-
- class Food{
- Snake snake;
- int x,y;
- boolean flag;
- Food(Snake snake){
- this.snake = snake;
- flag = true;
- int x = 0;
- int y = 0;
- while(flag){
- flag = false;
- x = Math.abs(new Random().nextInt()%40);
- y = Math.abs(new Random().nextInt()%40);
- if(snake.head.x==x && snake.head.y==y) flag = true;
- for(Point it:snake.body) if(it.x==x && it.y==y) flag = true;
- }
- this.x = x;
- this.y = y;
- }
-
- }
- class Snake{
- int size,length,dir;
- List<Point> body;
- Point head;
- Snake(Point head){
- size = 10;
- length = 5;dir = 4;
- this.head = head;
- body = new LinkedList<Point>();
- for(int i=0;i<length-1;i++){
- Point p = new Point(head.x,head.y+1+i);
- body.add(p);
- }
- }
- boolean isEat(Food food){
- if(head.x==food.x && head.y==food.y) return true;
- return false;
- }
- boolean isOut(){
- if(head.x<0 || head.y<0 || head.x>=40 || head.y>=40)
- return true;
- return false;
- }
- boolean isPitch(){
- for(Point it:body)
- if(head.x==it.x && head.y==it.y){
- dead(1);
- return true;
- }
- return false;
- }
- void dead(int way){
- System.exit(way);
- }
- }
- class MyPanel extends JPanel implements KeyListener,Runnable{
- Snake snake;
- Food food;
- int speed;
- MyPanel(Snake snake,Food food){
- this.snake = snake;
- this.food = food;
- speed = 526;
- }
- public void paint(Graphics g){
- super.paint(g);
- g.fillRect(0,0,400,400);
- g.setColor(Color.YELLOW);
- g.fillRect(snake.head.x*snake.size,snake.head.y*snake.size,snake.size,snake.size);
- g.setColor(Color.ORANGE);
- for(Point it:snake.body) g.fillRect(it.x*snake.size,it.y*snake.size,snake.size,snake.size);
- g.setColor(Color.GREEN);
- g.fillRect(food.x*snake.size,food.y*snake.size,snake.size,snake.size);
- }
- //自动行进
- public void keyPressed(Integer dir){
-
- Point oxy = new Point(snake.head);
- if(dir==3){
- snake.head.x--;
- }
- else if(dir==4){
- snake.head.x++;
- }
- else if(dir==1){
- snake.head.y--;
- }
- else if(dir==2){
- snake.head.y++;
- }else return;
-
- if(snake.isOut()) snake.dead(1);
-
- snake.body.add(0,oxy);
- if(snake.isEat(food)){
- snake.length++;
- if(speed >= 50) speed-=25;
- food = new Food(snake);
- }else snake.body.remove(snake.length-1);
-
- if(snake.isPitch()) snake.dead(2);
- repaint();
- }
- //按键仅用于修改蛇的方向
- public void keyPressed(KeyEvent e){
- int key = e.getKeyCode();
- //按鍵和行進方向相反，按鍵無效直接返回！
- if(((key==KeyEvent.VK_LEFT && snake.dir==4)||(key==KeyEvent.VK_UP && snake.dir==2)
- ||(key==KeyEvent.VK_DOWN && snake.dir==1)||(key==KeyEvent.VK_RIGHT && snake.dir==3))){
- return;
- }
- if(key == KeyEvent.VK_LEFT){
- snake.dir = 3;
- }
- else if(key == KeyEvent.VK_RIGHT){
- snake.dir = 4;
- }
- else if(key == KeyEvent.VK_UP){
- snake.dir = 1;
- }
- else if(key == KeyEvent.VK_DOWN){
- snake.dir = 2;
- }else return;
-
-
- }
- public void keyReleased(KeyEvent e){}
- public void keyTyped(KeyEvent e){}
-
- public synchronized void run(){
- while(true){
- try{Thread.sleep(speed);
- }catch(Exception e){}
- keyPressed(snake.dir);
- }
- }
- }
- public class GreedySnake extends JFrame{
- MyPanel mp;
- Snake snake;
- Food food;
- Thread t;
- public GreedySnake(){
- snake = new Snake(new Point(5,5));
- food = new Food(snake);
- mp = new MyPanel(snake,food);
- t = new Thread(mp);
- t.start();
- add(mp);
- addKeyListener(mp);
- setTitle("GreedySnake");
- setSize(40*10 + 15,40*10 + 38);
- setLocation(200,200);
- setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
- setVisible(true);
- }
- public static void main(String[] args){
- new GreedySnake();
- }
- }
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