贪吃蛇的小问题
我写了一个贪吃蛇程序，但是在画窗口里显示出来的移动不对（在没有吃到东西是自动增加），下面是我Snake类的代码，里面包含，draw（）方法和内部类Node表示蛇的每一节（这样所不是很清楚，我把全部代码都发过来了）：
- Java code
package snakeGame;import java.util.Random;public class AddEggs implements Runnable { private Random r = new Random(); Yard y; public AddEggs(Yard y) { this.y = y; } public void run() { while (true) { int count = r.nextInt(3) + 1; if (y.eggs.size() == 0) { try { for (int i = 0; i < count; i++) { Egg egg = new Egg(r.nextInt(Yard.COLS), r.nextInt(Yard.ROWS-2)+2); y.eggs.add(egg); } Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }}package snakeGame;public enum Direction { U, D, L, R}package snakeGame;import java.awt.Color;import java.awt.Graphics;import java.awt.Rectangle;public class Egg { private int cols,rows; private int w = Yard.BLOCK_SIZE; private int h = Yard.BLOCK_SIZE; private boolean live = true; public Egg(int cols,int rows){ this.cols = cols; this.rows = rows; } public void draw(Graphics g) { if(!live)return; Color c = g.getColor(); g.setColor(Color.MAGENTA); g.fillOval(Yard.BLOCK_SIZE*cols, Yard.BLOCK_SIZE*rows, w, h); g.setColor(c); } public Rectangle getRect() { return new Rectangle(Yard.BLOCK_SIZE*cols, Yard.BLOCK_SIZE*rows); } public boolean isLive() { return live; } public void setLive(boolean live) { this.live = live; }}package snakeGame;import java.awt.Color;import java.awt.Graphics;import java.awt.Rectangle;import java.awt.event.KeyEvent;import java.util.List;/** * 类，蛇 * * @author hejie */public class Snake { // 蛇头节点 Node head = null; // 蛇尾节点 Node tail = null; // 蛇的长度 private int size; private Node node = new Node(15, 20, Direction.R); private Yard y; public Snake(Yard y) { head = node; tail = node; this.y = y; this.size = 1; } public void draw(Graphics g) { if (size == 0) return; move(); for (Node n = head; n!= tail; n = n.nextNode) { n.draw(g); } } // 把一个节点加到蛇尾 public void addNodeTail() { Node node = null; switch (tail.dir) { case U: node = new Node(tail.cols, tail.rows + 1, tail.dir); break; case D: node = new Node(tail.cols, tail.rows - 1, tail.dir); break; case L: node = new Node(tail.cols + 1, tail.rows, tail.dir); break; case R: node = new Node(tail.cols - 1, tail.rows, tail.dir); break; } tail.nextNode = node; node.frontNode = tail; tail = node; size++; } // 把一个节点加到蛇头 public void addNodeHead() { Node node = null; switch (head.dir) { case U: node = new Node(head.cols, head.rows - 1, head.dir); break; case D: node = new Node(head.cols, head.rows + 1, head.dir); break; case L: node = new Node(head.cols - 1, head.rows, head.dir); break; case R: node = new Node(head.cols + 1, head.rows, head.dir); break; } node.nextNode = head; head.frontNode = node; head = node; size++; } private void deletTail() { if (size == 0) return; tail = tail.frontNode; tail.nextNode = null; size--; } public void keyPressed(KeyEvent ke) { int keyCode = ke.getKeyCode(); if (keyCode == ke.VK_UP || keyCode == ke.VK_W) { if (head.dir != Direction.D) head.dir = Direction.U; } else if (keyCode == ke.VK_DOWN || keyCode == ke.VK_S) { if (head.dir != Direction.U) head.dir = Direction.D; } else if (keyCode == ke.VK_LEFT || keyCode == ke.VK_A) { if (head.dir != Direction.R) head.dir = Direction.L; } else if (keyCode == ke.VK_RIGHT || keyCode == ke.VK_D) { if (head.dir != Direction.L) head.dir = Direction.R; } } private void move() { addNodeHead(); deletTail(); checkDead(); } public void eatEgg(List<Egg> eggs) { Egg egg; for (int i = 0; i < eggs.size(); i++) { egg = eggs.get(i); if (head.getRect().intersects(egg.getRect())) { this.addNodeHead(); egg.setLive(false); } } } private void checkDead() { if(head.rows < 0 || head.cols < 2 || head.rows > Yard.ROWS || head.cols > Yard.COLS) { y.stop(); } for(Node n = head.nextNode; n != null; n = n.nextNode) { if(head.rows == n.rows && head.cols == n.cols) { y.stop(); } } } /** * 构成蛇的节点 * * @author hejie */ private class Node { // 节点的起始位置 int cols, rows; // 节点宽度、高度 int w = Yard.BLOCK_SIZE, h = Yard.BLOCK_SIZE; // 节点方向 Direction dir = Direction.U; // 下一个节点 private Node nextNode = null; private Node frontNode = null; Node(int cols, int rows, Direction dir) { this.cols = cols; this.rows = rows; this.dir = dir; } // 画出本节点 public void draw(Graphics g) { Color c = g.getColor(); g.setColor(Color.BLACK); g.fillRect(Yard.BLOCK_SIZE * cols, Yard.BLOCK_SIZE * rows, w, h); g.setColor(c); } public Rectangle getRect() { return new Rectangle(Yard.BLOCK_SIZE * cols, Yard.BLOCK_SIZE * rows); } }}package snakeGame;import java.awt.Frame;import java.awt.Color;import java.awt.Graphics;import java.awt.Image;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.util.ArrayList;import java.util.List;public class Yard extends Frame{ public static final int ROWS = 40; public static final int COLS = 60; public static final int BLOCK_SIZE = 10; private boolean flag = true; Snake snake = new Snake(this); Image image = null; public List<Egg> eggs = new ArrayList<Egg>(); public Yard(){ super("贪吃蛇"); this.setBackground(Color.LIGHT_GRAY); this.setBounds(200, 100, COLS*BLOCK_SIZE, ROWS*BLOCK_SIZE); this.addKeyListener(new KeyMonitor()); this.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e) { System.exit(0); } }); this.setVisible(true); new Thread(new RepaintSnake()).start(); new Thread(new AddEggs(this)).start(); //System.out.println(eggs.size()); } public void update(Graphics g) { if(image==null){ image = this.createImage(COLS*BLOCK_SIZE, ROWS*BLOCK_SIZE); } Graphics gImage = image.getGraphics(); Color c = gImage.getColor(); gImage.setColor(Color.LIGHT_GRAY); gImage.fillRect(0, 0, COLS*BLOCK_SIZE, ROWS*BLOCK_SIZE); gImage.setColor(c); paint(gImage); g.drawImage(image, 0, 0, null); } public void paint(Graphics g) { Color c = g.getColor(); g.setColor(Color.BLUE); /*g.setColor(Color.LIGHT_GRAY); g.fillRect(0, 0, ROWS*BLOCK_SIZE, COLS*BLOCK_SIZE);*/ //竖线 for(int i=1;i<=COLS;i++){ g.drawLine(BLOCK_SIZE*i, 0, BLOCK_SIZE*i, BLOCK_SIZE*ROWS); } //横线 for(int i=1;i<=ROWS;i++){ g.drawLine(0, BLOCK_SIZE*i, BLOCK_SIZE*COLS, BLOCK_SIZE*i); } g.setColor(c); for(int i=0;i<eggs.size();i++){ eggs.get(i).draw(g); } snake.draw(g); snake.eatEgg(eggs); } public static void main(String[] args) { new Yard(); } private class RepaintSnake implements Runnable{ public void run() { while(flag){ repaint(); try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } } } } private class KeyMonitor extends KeyAdapter { public void keyPressed(KeyEvent ke){ snake.keyPressed(ke); } } public void stop() { flag = false; }}
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我没调试哇 但是我感觉如果是一直加Node的话就应该是这个东西的判断有问题
- Java code
if (head.getRect().intersects(egg.getRect()){}
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再提一句哇
我个人觉得这种格子游戏用碰撞检测不好哇 格子游戏不是每个格子都有坐标嘛
用坐标检测岂不是更好哇 而且逻辑也清楚 而且一般来说 游戏的碰撞检测都是有自己公司开发的API的
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高手，下班学习看看
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不知道问题出在哪,不过有两个地方不妥:
- Java code
for (Node n = head; n!= tail; n = n.nextNode) { //这里的循环条件应该是n!=null吧，尾节点也应该画出来的 n.draw(g);}
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学习一下
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贪食蛇可以看一下传智播客的视频教程 自己研究下该注意的问题和算法 好过让别人看那么复杂的代码