Java小游戏

这是一个飞机躲避子弹的小游戏，其中有许多干货

这是蒟蒻我第二次做，请各位大佬多多指教

目录

1.游戏主窗口的创建

2.图形绘制_文本绘制_颜色改变_图像对象的加载

3.线程内部类实现动画

4.游戏物体根类的实现

5.面向对象思想重构飞机类设计

6.键盘控制游戏物体原理

7.面向对象重构飞机类的键盘控制代码

8.炮弹类设计_任意角度飞行

9.容器或数组产生多发炮弹

10.双缓冲解决闪烁问题_矩形检测原理

11.炮弹和飞机的碰撞检测_飞机死掉

12.爆炸类_图片数组轮播处理

13.099_主窗口画出爆炸类

14.100_飞机死亡和计时功能

//创建类

public class Constant {
    public static final int GAME_WIDTH = 500;
    public static final  int  GAME_HEIGHT = 500;
}

当飞机与子弹发生碰撞时的爆炸效果的实现

import java.awt.Graphics;
import java.awt.Image;

/*
 * 爆炸类
 */
public class Explode {
    double x, y;

    static Image[] imgs = new Image[16];
    static {
        for (int i = 0; i < 16; i++) {
            imgs[i] = GameUtil.getImage("images/explode/e" + (i + 1) + ".gif");
            imgs[i].getWidth(null);
        }
    }

    int count;

    public void draw(Graphics g) {
        if (count <= 15) {
            g.drawImage(imgs[count], (int) x, (int) y, null);
            count++;
        }
    }

    public Explode(double x, double y) {
        this.x = x;
        this.y = y;
    }
}

游戏物体

package cn.sxt.game;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;

/**
 * 游戏物体的父类
 * @author VictorDW
 *
 */
public class GameObject {
      Image  img;
      double  x,y;
       int   speed;
      int  width, height;

    public  void  drawSelf(Graphics  g){
        g.drawImage(img, (int)x,(int) y, null);
    }

    public GameObject(Image img, double x, double y, int speed, int width, int height) {
        super();
        this.img = img;
        this.x = x;
        this.y = y;
        this.speed = speed;
        this.width = width;
        this.height = height;
    }

    public GameObject(Image img, double x, double y) {
        super();
        this.img = img;
        this.x = x;
        this.y = y;
    }

    public GameObject() {
    }

    /**
     * 返回物体所在的矩形。便于后续的碰撞检测
     * @return
     */
    public  Rectangle   getRect(){
        return  new Rectangle((int)x, (int)y, width, height);
    }

}

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;

public class GameUtil {
    // 工具类最好将构造器私有化。
    private GameUtil() {
    } 

    /**
     * 返回指定路径文件的图片对象
     * @param path
     * @return
     */
    public static Image getImage(String path) {
        BufferedImage bi = null;
        try {
            URL u = GameUtil.class.getClassLoader().getResource(path);
            bi = ImageIO.read(u);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bi;
    }
}

飞机

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;

public class Plane  extends GameObject {
    boolean  left,up,right,down;

    boolean  live = true;  

    public  void  drawSelf(Graphics  g){
        if(live){
                g.drawImage(img, (int)x,(int) y, null);

                if(left){
                    x -=speed;
                }
                if(right){
                    x += speed;
                }
                if(up){
                    y -=speed;    //y = y-speed;
                }
                if(down){
                    y += speed;
            }
        }else{

        }

    }

    public  Plane(Image  img, double x, double y){
        this.img = img;
        this.x = x;
        this.y = y;
        this.speed = 5;
        this.width = img.getWidth(null) ;
        this.height = img.getHeight(null);

    }

    //按下某个键，增加相应的方向
    public  void   addDirection(KeyEvent  e){
        switch (e.getKeyCode()) {
        case KeyEvent.VK_LEFT:
            left = true;
            break;
        case KeyEvent.VK_UP:
            up = true;
            break;
        case KeyEvent.VK_RIGHT:
            right = true;
            break;
        case KeyEvent.VK_DOWN:
            down = true;
            break;
        }
    }

    //按下某个键，取消相应的方向
        public  void   minusDirection(KeyEvent  e){
            switch (e.getKeyCode()) {
            case KeyEvent.VK_LEFT:
                left = false;
                break;
            case KeyEvent.VK_UP:
                up = false;
                break;
            case KeyEvent.VK_RIGHT:
                right = false;
                break;
            case KeyEvent.VK_DOWN:
                down = false;
                break;
            }
        }

}

炮弹

import java.awt.Color;
import java.awt.Graphics;

/**
 * 炮弹类
 *
 *
 */
public class Shell   extends  GameObject {

    double  degree;

    public  Shell(){
        x = 200;
        y = 200;
        width=10;
        height = 10;
        speed = 3;
        degree = Math.random()*Math.PI*2;
    }

    public  void   draw(Graphics  g){
        Color   c =  g.getColor();
        g.setColor(Color.YELLOW);

        g.fillOval((int)x,(int) y, width, height);

        //炮弹沿着任意角度去飞
        x += speed*Math.cos(degree);
        y += speed*Math.sin(degree);

        if(x<0||x>Constant.GAME_WIDTH-width){
            degree  = Math.PI - degree;
        }

        if(y<30||y>Constant.GAME_HEIGHT-height){
            degree  = - degree;
        }

        g.setColor(c);
    }

}

主类

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;
import java.util.Date;

/**
 * 飞机游戏的主窗口
 * @author VictorDW
 *
 */
public class MyGameFrame  extends  Frame {

    Image   planeImg  = GameUtil.getImage("images/plane.png");
    Image   bg  = GameUtil.getImage("images/bg.jpg");

    Plane   plane = new Plane(planeImg,250,250);
    Shell[]   shells = new Shell[30];

    Explode   bao ;
    Date  startTime = new Date();
    Date  endTime;
    int period;   //游戏持续的时间

    @Override
    public void paint(Graphics g) {        //自动被调用。  g相当于一只画笔
        Color   c =  g.getColor();
        g.drawImage(bg, 0, 0, null);

        plane.drawSelf(g);  //画飞机

        //画出所有的炮弹
        for(int i=0;i<shells.length;i++){
            shells[i].draw(g);

            //飞机和炮弹的碰撞检测！！！
            boolean  peng = shells[i].getRect().intersects(plane.getRect());
            if(peng){
                plane.live = false;
                if(bao ==null){
                    bao  = new Explode(plane.x, plane.y);

                    endTime = new Date();
                    period = (int)((endTime.getTime()-startTime.getTime())/1000);
                }
                bao.draw(g);
            }

            //计时功能，给出提示
            if(!plane.live){
                g.setColor(Color.red);
                Font   f  =  new Font("宋体", Font.BOLD, 50);
                g.setFont(f);
                g.drawString("时间："+period+"秒", (int)plane.x, (int)plane.y);
            }

        }

        g.setColor(c);
    }

    //帮助我们反复的重画窗口！
    class  PaintThread  extends  Thread  {
        @Override
        public void run() {
            while(true){
                repaint();        //重画

                try {
                    Thread.sleep(40);       //1s=1000ms
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    //定义键盘监听的内部类
    class   KeyMonitor extends  KeyAdapter  {

        @Override
        public void keyPressed(KeyEvent e) {
            plane.addDirection(e);
        }

        @Override
        public void keyReleased(KeyEvent e) {
            plane.minusDirection(e);
        }

    }

    /**
     * 初始化窗口
     */
    public  void  launchFrame(){
        this.setTitle("躲避byYD");
        this.setVisible(true);
        this.setSize(Constant.GAME_WIDTH    , Constant.GAME_HEIGHT);
        this.setLocation(300, 300);

        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        new PaintThread().start();    //启动重画窗口的线程
        addKeyListener(new KeyMonitor());   //给窗口增加键盘的监听

        //初始化50个炮弹
        for(int i=0;i<shells.length;i++){
            shells[i] = new Shell();
        }

    }

    public static void main(String[] args) {
        MyGameFrame  f = new MyGameFrame();
        f.launchFrame();
    }

    private Image offScreenImage = null;

    public void update(Graphics g) {
        if(offScreenImage == null)
            offScreenImage = this.createImage(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);//这是游戏窗口的宽度和高度

        Graphics gOff = offScreenImage.getGraphics();
        paint(gOff);
        g.drawImage(offScreenImage, 0, 0, null);
    }

}

以下是背景与模型，可以自己修改与更换

背景图

飞机模型

爆炸效果