import java.awt.*;
import java.awt.event.*;public class Yard extends Frame {
public static final int ROWS = 30;
public static final int COLS = 30;
public static final int BLOCK_SIZE = 15;
Image offScreenImage = null; //双缓冲
boolean flag = true;
int score = 0;
Snake s = new Snake(this);
Eggs e = new Eggs();
public static void main(String args[]) {
new Yard().launch();
}
public void launch() {
this.setLocation(200,200);
this.setSize(COLS * BLOCK_SIZE,ROWS * BLOCK_SIZE );
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setVisible(true);
this.addKeyListener(new KeyMonitor());
new Thread(new PaintThread()).start();
}
//双缓冲方法
public void update(Graphics g) {
if(offScreenImage == null)
offScreenImage = this.createImage(COLS * BLOCK_SIZE,ROWS * BLOCK_SIZE);
Graphics gOff = offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage,0,0,null);
}
public void stop() {
flag = false;
}
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(Color.GRAY);
g.fillRect(0, 0,COLS * BLOCK_SIZE,ROWS * BLOCK_SIZE);
g.setColor(Color.DARK_GRAY);
//画出横线
for(int i=0; i< ROWS; i++) {
g.drawLine(0, BLOCK_SIZE*i, COLS*BLOCK_SIZE, BLOCK_SIZE*i);
}
//画出竖线
for(int i =0; i<COLS; i++) {
g.drawLine(BLOCK_SIZE*i, 0, BLOCK_SIZE*i, ROWS*BLOCK_SIZE);
}
g.setColor(Color.YELLOW);
g.drawString("Score:"+score, 10, 60);
if(flag == false) {
g.setColor(Color.red);
// g.setFont(new Font("宋体",Font.BOLD,50));
g.drawString("Game Over",10,80);
}
g.setColor(c);
s.eat(e);
e.draw(g);
s.draw(g);
}
public class PaintThread implements Runnable {
public void run() {
while(flag) {
repaint();
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private class KeyMonitor extends KeyAdapter {
public void keyPressed(KeyEvent e) {
s.keyPressed(e);
}
} public void setScore(int score) {
this.score = score;
}
}
蛇类:import java.awt.*;
import java.awt.event.KeyEvent;public class Snake {
private Node head = null;
private Node tail = null;
private int size = 0;
private Yard y;
private Node n = new Node(20,30,Dir.L);
Snake(Yard y) {
head = n;
tail = n;
size = 1;
this.y = y;
}
public void addToTail() {
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() {
addToHead();
deleteFromTail();
checkDead();
} private void checkDead() {
if(head.row < 0 || head.col < 2 || 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() {
if(size == 0)
return;
tail = tail.prev;
tail.next = null;
} private class Node {
int row;
int col;
int h = Yard.BLOCK_SIZE;
int w = Yard.BLOCK_SIZE;
Dir dir = Dir.L;
Node next = null;
Node prev = null; //前指针
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.GREEN);
g.fillRect(Yard.BLOCK_SIZE*col, Yard.BLOCK_SIZE*row, w, h);
g.setColor(c);
}
}
// boolean intersects(Rectangle r) :确定此 Rectangle 是否与指定的 Rectangle 相交
public void eat(Eggs e) {
if(this.getRect().intersects(e.getRect())) {
e.reAppeal();
this.addToHead(); //增加一节
y.setScore(y.score+5);
}
}
//Rectangle 指定坐标空间中的一个区域
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) {
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;
}
}
}
吃的东西类:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.Random;
public class Eggs {
private int row;
private int col;
int h = Yard.BLOCK_SIZE;
int w = Yard.BLOCK_SIZE;
static Random r = new Random();
private Color color = Color.blue;
public Eggs(int row,int col) {
this.row = row;
this.col = col;
}
public Eggs() {
this(r.nextInt(Yard.ROWS-2)+2,r.nextInt(Yard.COLS));
}
//Rectangle 指定坐标空间中的一个区域
public Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * col,Yard.BLOCK_SIZE * row,w,h);
}
public void reAppeal() {
this.row = r.nextInt(Yard.ROWS-2)+2; //减三加三是防止蛋跑到墙外
this.col = r.nextInt(Yard.COLS);
}
public void draw(Graphics g) {
Color c = g.getColor();
g.setColor(color);
g.fillOval(Yard.BLOCK_SIZE*row, Yard.BLOCK_SIZE*col, w, h);
g.setColor(c);
if(color == Color.blue)
color = Color.red;
else
color = Color.blue;
}
}
方向枚举类:public enum Dir {
L,U,R,D
}
import java.awt.event.*;public class Yard extends Frame {
public static final int ROWS = 30;
public static final int COLS = 30;
public static final int BLOCK_SIZE = 15;
Image offScreenImage = null; //双缓冲
boolean flag = true;
int score = 0;
Snake s = new Snake(this);
Eggs e = new Eggs();
public static void main(String args[]) {
new Yard().launch();
}
public void launch() {
this.setLocation(200,200);
this.setSize(COLS * BLOCK_SIZE,ROWS * BLOCK_SIZE );
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setVisible(true);
this.addKeyListener(new KeyMonitor());
new Thread(new PaintThread()).start();
}
//双缓冲方法
public void update(Graphics g) {
if(offScreenImage == null)
offScreenImage = this.createImage(COLS * BLOCK_SIZE,ROWS * BLOCK_SIZE);
Graphics gOff = offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage,0,0,null);
}
public void stop() {
flag = false;
}
public void paint(Graphics g) {
Color c = g.getColor();
g.setColor(Color.GRAY);
g.fillRect(0, 0,COLS * BLOCK_SIZE,ROWS * BLOCK_SIZE);
g.setColor(Color.DARK_GRAY);
//画出横线
for(int i=0; i< ROWS; i++) {
g.drawLine(0, BLOCK_SIZE*i, COLS*BLOCK_SIZE, BLOCK_SIZE*i);
}
//画出竖线
for(int i =0; i<COLS; i++) {
g.drawLine(BLOCK_SIZE*i, 0, BLOCK_SIZE*i, ROWS*BLOCK_SIZE);
}
g.setColor(Color.YELLOW);
g.drawString("Score:"+score, 10, 60);
if(flag == false) {
g.setColor(Color.red);
// g.setFont(new Font("宋体",Font.BOLD,50));
g.drawString("Game Over",10,80);
}
g.setColor(c);
s.eat(e);
e.draw(g);
s.draw(g);
}
public class PaintThread implements Runnable {
public void run() {
while(flag) {
repaint();
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private class KeyMonitor extends KeyAdapter {
public void keyPressed(KeyEvent e) {
s.keyPressed(e);
}
} public void setScore(int score) {
this.score = score;
}
}
蛇类:import java.awt.*;
import java.awt.event.KeyEvent;public class Snake {
private Node head = null;
private Node tail = null;
private int size = 0;
private Yard y;
private Node n = new Node(20,30,Dir.L);
Snake(Yard y) {
head = n;
tail = n;
size = 1;
this.y = y;
}
public void addToTail() {
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() {
addToHead();
deleteFromTail();
checkDead();
} private void checkDead() {
if(head.row < 0 || head.col < 2 || 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() {
if(size == 0)
return;
tail = tail.prev;
tail.next = null;
} private class Node {
int row;
int col;
int h = Yard.BLOCK_SIZE;
int w = Yard.BLOCK_SIZE;
Dir dir = Dir.L;
Node next = null;
Node prev = null; //前指针
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.GREEN);
g.fillRect(Yard.BLOCK_SIZE*col, Yard.BLOCK_SIZE*row, w, h);
g.setColor(c);
}
}
// boolean intersects(Rectangle r) :确定此 Rectangle 是否与指定的 Rectangle 相交
public void eat(Eggs e) {
if(this.getRect().intersects(e.getRect())) {
e.reAppeal();
this.addToHead(); //增加一节
y.setScore(y.score+5);
}
}
//Rectangle 指定坐标空间中的一个区域
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) {
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;
}
}
}
吃的东西类:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.Random;
public class Eggs {
private int row;
private int col;
int h = Yard.BLOCK_SIZE;
int w = Yard.BLOCK_SIZE;
static Random r = new Random();
private Color color = Color.blue;
public Eggs(int row,int col) {
this.row = row;
this.col = col;
}
public Eggs() {
this(r.nextInt(Yard.ROWS-2)+2,r.nextInt(Yard.COLS));
}
//Rectangle 指定坐标空间中的一个区域
public Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * col,Yard.BLOCK_SIZE * row,w,h);
}
public void reAppeal() {
this.row = r.nextInt(Yard.ROWS-2)+2; //减三加三是防止蛋跑到墙外
this.col = r.nextInt(Yard.COLS);
}
public void draw(Graphics g) {
Color c = g.getColor();
g.setColor(color);
g.fillOval(Yard.BLOCK_SIZE*row, Yard.BLOCK_SIZE*col, w, h);
g.setColor(c);
if(color == Color.blue)
color = Color.red;
else
color = Color.blue;
}
}
方向枚举类:public enum Dir {
L,U,R,D
}
解决方案 »
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- 接口不是抽象类嘛,为什么还可以这样用?其方法也不用是抽象类,还可以new对象?
其实不是不能吃,是你画的位置是歪的
还不错,挺好玩的。。就是有时候坐标会变成负数。。
你自己再检查吧 public Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * row,Yard.BLOCK_SIZE * col,w,h);
}