Java learning_Day14
本人学习视频用的是马士兵的,也在这里献上
<链接:https://pan.baidu.com/s/1qKNGJNh0GgvlJnitTJGqgA>
提取码:fobs
主要内容:
小游戏:贪吃蛇
成果图:
代码
Yard.java 部分
摘要:下面程序段主要用于显示背景界面以及游戏的开始与结束。
import java.awt.*;
import java.awt.event.*;
public class Yard extends Frame {
PaintThread paintThread = new PaintThread();
private boolean flag = true; //判断游戏是否结束
//游戏的行列和每个格子的大小
public static final int ROWS = 30;
public static final int COLS = 30;
public static final int BLOCK_SIZE = 15;
private int score = 0;
Snake s = new Snake(this);
Egg e = new Egg();
Image offScreenImage = null;
//初始化游戏界面
public void launch() {
this.setLocation(200, 200);
this.setSize(COLS * BLOCK_SIZE, ROWS * BLOCK_SIZE);
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setVisible(true);
this.addKeyListener(new KeyMonitor());;
new Thread(paintThread).start();
}
public static void main(String[] args) {
new Yard().launch();
}
//当游戏终止操作
public void stop() {
flag = false;
}
//画出背景,游戏动画的执行部分
@Override
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 = 1; i < ROWS; i++) {
g.drawLine(0, BLOCK_SIZE * i, COLS * BLOCK_SIZE, BLOCK_SIZE * i);
}
//画出竖线
for (int i = 1; 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);
s.eat(e);
e.draw(g);
s.draw(g);
//当游戏结束时,提示玩家
if(flag == false) {
g.setFont(new Font("华文彩云", Font.BOLD | Font.HANGING_BASELINE, 50));
g.drawString("game over", 105, 240);
paintThread.pause();
}
g.setColor(c);
}
//防止画面闪烁
@Override
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);
}
//控制动作的进行和终止
private class PaintThread implements Runnable {
private boolean pause = false;
public void run() {
while(flag) {
if(pause) continue;
else repaint();
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void pause() {
this.pause = true;
}
public void reStart() {
pause = false;
s = new Snake(Yard.this);
}
}
private class KeyMonitor extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if(key == KeyEvent.VK_F2) paintThread.reStart(); //当按下F2时重玩游戏
s.keyPressed(e);
}
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
}
Snake.java
摘要:下面程序段主要用于响应蛇的相关操作。
import java.awt.*;
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;
}
//将节点加在蛇的尾巴上
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++;
}
//将节点加在蛇的头部
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++;
}
//画蛇
public void draw(Graphics g) {
if (size <= 0) return;
move();
for (Node n = head; n != null; n = n.next) {
n.draw(g);
}
}
//控制蛇的移动
private void move() {
addToHead();
deleteFromTail();
checkDead();
}
//检验蛇是否死亡
private void checkDead() {
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();
}
}
//将蛇的尾部去除,主要用于蛇的移动
private void deleteFromTail() {
if(size == 0) return;
tail = tail.prev;
tail.next = null;
}
//蛇的每一个节点的属性
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;
}
//蛇的身体的绘画
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);
}
}
//蛇吃了蛋的响应
public void eat(Egg e) {
if(this.getRect().intersects(e.getRect())) {
e.reAppear();
this.addToHead();
y.setScore(y.getScore() + 5);
}
}
//返回蛇头的位置
private Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * head.col, Yard.BLOCK_SIZE * head.row, head.w, head.h);
}
//响应玩家按键
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;
}
}
}
Egg.java 部分
摘要:下面程序段主要用于生成蛋。
import java.awt.*;
import java.util.Random;
public class Egg {
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-2) + 2, r.nextInt(Yard.COLS));
}
//使蛋随机出现
public void reAppear() {
this.row = r.nextInt(Yard.ROWS-2) + 2;
this.col = r.nextInt(Yard.COLS);
}
//返回蛋的位置
public Rectangle getRect() {
return new Rectangle(Yard.BLOCK_SIZE * this.col, Yard.BLOCK_SIZE * this.row, this.w, this.h);
}
//画蛋
public 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.RED;
else color = Color.GREEN;
}
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;
}
}
Dir.java 部分
摘要:四个方向键。
public enum Dir {
L, U, R, D
}