0基础学习Java ——贪吃蛇的项目（跟别人学的...）
本帖最后由 回忆一遥远 于 2017-8-16 07:34 编辑先上各个文件
Dir.java
public enum Dir {
L, U, R, D
}
记录了四个方向的标识
Egg.java
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.Random;
public class Egg {
public int getRow() {
return row;
}
public void setRow(int row) {
this.row = row;
}
public int getCol() {
return col;
}
public void setCol(int col) {
this.col = col;
}
int row, col;
int w = Yard.BLOCK_SIZE;
int h = Yard.BLOCK_SIZE;
private static Random r = new Random();
private Color color = Color.GREEN;
public Egg(int row, int col) {
this.row = row;
this.col = col;
}
public Egg() {
this(r.nextInt(Yard.ROWS - 3) + 3, r.nextInt(Yard.COLS));
}
public void reAppear() {
this.row = r.nextInt(Yard.ROWS - 3) + 3;
this.col = r.nextInt(Yard.COLS);
}
public Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * col, Yard.BLOCK_SIZE * row, w, h);
}
void draw(Graphics g) {
Color c = g.getColor();
g.setColor(color);
g.fillOval(Yard.BLOCK_SIZE * col, Yard.BLOCK_SIZE * row, w, h);
g.setColor(c);
if(color == Color.GREEN) color = Color.BLUE;
else color = Color.GREEN;
}
}
定义和蛇要吃的蛋的行为和属性
Snake.java
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
public class Snake {
private Node head = null;
private Node tail = null;
private int size = 0;
private Node n = new Node(20, 30, Dir.L);
private Yard y;
/* public Snake(Node node) {
head = node;
tail = node;
size = 1;
}*/
public Snake(Yard y) {
head = n;
tail = n;
size = 1;
this.y = y;
}
public void addToTall() {
Node node = null;
switch(tail.dir) {
case L :
node = new Node(tail.row, tail.col + 1, tail.dir);
break;
case U :
node = new Node(tail.row + 1, tail.col, tail.dir);
break;
case R :
node = new Node(tail.row, tail.col - 1, tail.dir);
break;
case D :
node = new Node(tail.row - 1, tail.col, tail.dir);
break;
}
tail.next = node;
node.prev = tail;
tail = node;
size++;
}
public void addToHead() {
Node node = null;
switch(head.dir) {
case L :
node = new Node(head.row, head.col - 1, head.dir);
break;
case U :
node = new Node(head.row - 1, head.col, head.dir);
break;
case R :
node = new Node(head.row, head.col + 1, head.dir);
break;
case D :
node = new Node(head.row + 1, head.col, head.dir);
break;
}
node.next = head;
head.prev = node;
head = node;
size++;
}
public void draw(Graphics g) {
if(size <= 0) return;
move();
for(Node n = head; n != null; n = n.next) {
n.draw(g);
}
}
private void move() {
// TODO Auto-generated method stub
addToHead();
deleteFromTail();
checkDead();
}
private void checkDead() {
// TODO Auto-generated method stub
if(head.row < 2 || head.col < 0 || head.row > Yard.ROWS || head.col > Yard.COLS) {
y.stop();
}
for(Node n = head.next; n != null; n = n.next) {
if(head.row == n.row && head.col == n.col) {
y.stop();
}
}
}
private void deleteFromTail() {
// TODO Auto-generated method stub
if(size == 0) return;
tail = tail.prev;
tail.next = null;
}
private class Node{
int w = Yard.BLOCK_SIZE;
int h = Yard.BLOCK_SIZE;
int row , col;
Dir dir = Dir.L;
Node next = null;
Node prev = null;
Node(int row, int col, Dir dir) {
this.row = row;
this.col = col;
this.dir = dir;
}
void draw(Graphics g) {
Color c = g.getColor();
g.setColor(Color.BLACK);
g.fillRect(Yard.BLOCK_SIZE * col, Yard.BLOCK_SIZE * row, w, h);
g.setColor(c);
}
}
public void eat(Egg e) {
if(this.getRect().intersects(e.getRect())) {
e.reAppear();
this.addToHead();
y.setScore(y.getScore() + 5);
}
}
private Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * head.col, Yard.BLOCK_SIZE * head.row, head.w, head.h);
}
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
int key = e.getKeyCode();
switch(key) {
case KeyEvent.VK_LEFT:
if(head.dir != Dir.R)
head.dir = Dir.L;
break;
case KeyEvent.VK_UP:
if(head.dir != Dir.D)
head.dir = Dir.U;
break;
case KeyEvent.VK_RIGHT:
if(head.dir != Dir.L)
head.dir = Dir.R;
break;
case KeyEvent.VK_DOWN:
if(head.dir != Dir.U)
head.dir = Dir.D;
break;
}
}
}
定义了蛇的行为和属性
Yard.java
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
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;
public class Yard extends Frame {
PaintThread paintThread = new PaintThread();
public boolean gameOver = false;
public static final int ROWS = 50;
public static final int COLS = 50;
public static final int BLOCK_SIZE = 20;
private int score = 0;
Snake s = new Snake(this);
Egg e = new Egg();
Image offScreenImage = null;
public void launch() {
this.setLocation(300, 300);
this.setSize(COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
// TODO Auto-generated method stub
System.exit(0);
}
});
this.setVisible(true);
this.addKeyListener(new KeyMonitor());
new Thread(paintThread).start();
//new Thread(paintThread).start();
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new Yard().launch();
}
public void stop() {
gameOver = true;
}
@Override
public void paint(Graphics g) {
// TODO Auto-generated method stub
Color c = g.getColor();
g.setColor(Color.GRAY);
g.fillRect(0, 0, COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
g.setColor(Color.DARK_GRAY);
// Print line
for(int i = 0; i < ROWS; i++) {
g.drawLine(0, BLOCK_SIZE * i, COLS * BLOCK_SIZE, BLOCK_SIZE * i);
}
for(int i = 0; i < COLS; i++) {
g.drawLine(BLOCK_SIZE * i, 0, BLOCK_SIZE * i, BLOCK_SIZE * ROWS);
}
g.setColor(Color.YELLOW);
g.drawString("score: " + score, 10, 60);
if(gameOver) {
g.setFont(new Font("Verdana", Font.BOLD, 100));
g.drawString("Game over", 180, 400);
paintThread.pause();
}
g.setColor(c);
s.eat(e);
e.draw(g);
s.draw(g);
}
@Override
public void update(Graphics g) {
// TODO Auto-generated method stub
if(offScreenImage == null) {
offScreenImage = this.createImage(COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
}
Graphics gOff = offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage, 0, 0, null);
}
private class PaintThread implements Runnable {
private boolean runing = true;
private boolean pause = false;
@Override
public void run() {
// TODO Auto-generated method stub
while(runing) {
if(pause) continue;
else repaint();
try {
Thread.sleep(120);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void pause() {
this.pause = true;
}
public void reStart() {
/*this.pause = false;
s = new Snake(Yard.this);
gameOver = false;*/
new Yard().launch();
}
/*public void gameOver() {
runing = false;
}*/
}
private class KeyMonitor extends KeyAdapter{
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if(key == KeyEvent.VK_F2) {
paintThread.reStart();
}
// TODO Auto-generated method stub
s.keyPressed(e);
}
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
}
定义了环境的属性...和游戏的判断(规则)
操作方法：方向键控制方向，F2 重置游戏
噗~不能上传图片了，明天再上传吧{:10_266:}
数组可以使用 length 来获取数组的长度
Math.random() 获取 0-1 之间的随机数 谢谢分享，学习下
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