java最简桌球小游戏教程

一、建立基础

• 新建 ballgame1.java 文件，新建 images 文件夹，把游戏涉及的 ball desk 图片放进去

• 制作一个基础的窗口

import java.awt.*;
import javax.swing.*;
public class BallGame extends JFrame {
      // 窗口加载
      void launchFrame() {
        setSize(300, 300);
        setLocation(400, 400);
        setVisible(true);
         }


      //main 方法是执行程序的入口
      public static void main(String[] args) {
        System.out.println("hello, it my first game");
        BallGame game = newBallGame();
        game.launchFrame();
       }
}

最终效果

二、加载两个图片

import java.awt.* ;
import javax.swing.*;
public class BallGame extends JFrame {
        Image ball = Toolkit.getDefaultToolkit().getImage('images/ball.png');
        Image desk = Toolkit.getDefaultToolkit().getImage('images/desk.jpg');

        double x = 100; //小球的坐标
        double y = 100;

        //画窗口的方法
        public void paint(Graphics g){
                System.out.println('windows load again');
                g.drawImage(desk, 0, 0, null);
                g.drawImage(ball, (int)x, (int)y, null);
        }

        // 窗口加载
        void launchFrame(){
                setSize(856,500);
                setLocation(50,50);
                setVisible(true);
        }

public static void main(String[] args){
        System.out.println('the first game');
        BallGame game = new BallGame();
        game.launchFrame();
    }

}

最终效果

三、实现小球水平动态运动

import java.awt.*;
import javax.swing.*;
public class BallGame extends JFrame {
        Image ball = Toolkit.getDefaultToolkit().getImage('images/ball.png');
        Image desk = Toolkit.getDefaultToolkit().getImage('images/desk.jpg');
        
        double x = 100;
        double y = 100;
        boolean right = true; //方向
        //画窗的方法
        public void paint(Graphics g){
                System.out.println('paint again');
                g.drawImage(desk, 0, 0, null);
                g.drawImage(ball, (int)x, (int)y, null);
                if(right){
                        x = x + 10;
                } else{
                        x = x - 10;
                }
                if(x>856-70){
                        right = false;
                }
                if(x<40){
                right = true;
                }                   
       }

        void launchFrame(){
                setSize(856,500);
                setLocation(50, 50);
                setVisible(true);
                while(true){
                        repaint();
                        try{
                                Thread.sleep(40);
                            }catch(Expection e){
                                e.printStackTrace(); 
                            }
                }
        }

        public static void main(String[] args){
                System.out.println('my first game');
                BallGame game = new BallGame();
                game.launcFrame();
        }

    }

四、小球沿着任意角度运动（复制）

import  java.awt.*;
import javax.swing.*;
 
public class BallGame2 extends JFrame {
     
    Image ball = Toolkit.getDefaultToolkit().getImage("images/ball.png");
    Image desk = Toolkit.getDefaultToolkit().getImage("images/desk.jpg");
     
    double  x=100;    //小球的横坐标
    double  y=100; //小球的纵坐标
     
    double degree = 3.14/3;    //弧度。此处就是：60度
     
    //画窗口的方法
    public void paint(Graphics  g){
        System.out.println("窗口被画了一次！");
        g.drawImage(desk, 0, 0, null);
        g.drawImage(ball,(int)x, (int)y, null);
         
         
        x  = x+ 10*Math.cos(degree);
        y  = y +10*Math.sin(degree); 
         
        //碰到上下边界
        if(y>500-40-30||y<40+40){//500是窗口高度；40是桌子边框，30是球直径；最后一个40是标题栏的高度
            degree = -degree;
        }
         
        //碰到左右边界
        if(x<40||x>856-40-30){
            degree = 3.14 - degree;
        }
         
    }
     
    //窗口加载
    void launchFrame(){
        setSize(856,500);
        setLocation(50,50);
        setVisible(true);
         
        //重画窗口,每秒画25次
        while(true){
            repaint(); 
            try{
                Thread.sleep(40);   //40ms,   1秒=1000毫秒.  大约一秒画25次窗口
            }catch(Exception e){
                e.printStackTrace();
            }
             
        }
         
    }
     
    //main方法是程序执行的入口
    public static void main(String[] args){
        System.out.println(" 小游戏而已！");
        BallGame2 game = new BallGame2();
        game.launchFrame();
    }
     
}