各种曲线运动、弹球、笔记

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// 绘制曲线
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image img = Toolkit.getDefaultToolkit().getImage("pingpang.jpg"); // 这种写法的问题就是开始时静态图像不会显示，需要最小化或最大化后才能显示
    double x = 200;
    double y = 200;
    double degree = 0; 
    public void paint(Graphics g) // 自动调用, g相当于画笔
    {
            System.out.println("窗口被画了一次");
            g.drawImage(img, (int)x, (int)y, null);
            // 椭圆
            /*x = 250 + 200*Math.cos(degree);
            y = 250 + 100*Math.sin(degree);*/
             
            // 正弦曲线
            x = x + 2;
            y = 200 + 100*Math.sin(degree);
            degree = degree + 0.1;
             
         
// g.drawImage(img, 100, 100, null);
         
        /*g.setColor(Color.GREEN);
        g.drawLine(100, 100, 200, 200);
        g.drawRect(50, 50, 100, 80);
        g.drawOval(50, 50, 100, 80);
        g.setColor(Color.YELLOW);
        g.drawString("游戏开始！", 80, 80);*/
    }
    void launchFrame()
    {
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("hallo ball");
        setBackground(Color.blue);
        setVisible(true);
        new PaintThread().start();
    }
     
     
    public static void main(String[] args)
    {
        new BallGame().launchFrame();
         
    }
     
    class PaintThread extends Thread
    {
        public void run()
        {
            while(true)
            {
                repaint(); // 重画窗口!
                try
                {
                    Thread.sleep(40); // 40MS, 1S画25次
                 
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
                 
            }
        }
    }
}
//------------------------------我是分割线---------------------------------------------------------------
弹球:
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image img = Toolkit.getDefaultToolkit().getImage("pingpang.png"); // 这种写法的问题就是开始时静态图像不会显示，需要最小化或最大化后才能显示
    double x = 100;
    double y = 100;
    double degree = 3.14 / 3; 
    public void paint(Graphics g) // 自动调用, g相当于画笔
    {
            System.out.println("窗口被画了一次");
            g.drawImage(img, (int)x, (int)y, null);
             
            if(y > 300 - 30)
            {
                degree = -degree;
            }
            else if(y < 30)
            {
                degree = - degree;
            }
            else if(x > 500 - 30)
            {
                degree = 3.14 - degree;
            }
            else if(x < 0)
            {
                degree = 3.14 - degree;
            }
             
            x = x + 10*Math.cos(degree);
            y = y + 10*Math.sin(degree);
                 
         
//        g.drawImage(img, 100, 100, null);
         
        /*g.setColor(Color.GREEN);
        g.drawLine(100, 100, 200, 200);
        g.drawRect(50, 50, 100, 80);
        g.drawOval(50, 50, 100, 80);
        g.setColor(Color.YELLOW);
        g.drawString("游戏开始！", 80, 80);*/
    }
    void launchFrame()
    {
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("hallo ball");
        setBackground(Color.blue);
        setVisible(true);
        new PaintThread().start();
    }
     
     
    public static void main(String[] args)
    {
        new BallGame().launchFrame();
         
    }
     
    class PaintThread extends Thread
    {
        public void run()
        {
            while(true)
            {
                repaint(); // 重画窗口!
                try
                {
//                    Thread.sleep(40); // 40MS, 1S画25次
                    Thread.sleep(40);
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
                 
            }
        }
    }
}
//----------------------------我是分割线--------------------------------------------------
笔记：
1.JAVA开发环境安装和配置
a)下载JDK(Java Development Kit) 
b)安装JDK、 JRE(Java Runtime environment)
c)配置环境变量：
i.path(系统通过path指定的目录寻找相关的可执行文件！)
右键单击我的电脑属性高级环境变量修改path即可！
ii.classpath(系统通过classpath寻找类文件)
JDK1.5之后，可以不设置！
2.Eclipse的使用（目前使用最多的IDE:integrated development environment集成开发环境）
a)下载
b)解压即可
3.新建一个JAVA项目
a)New Java Project只需要输入project name，回车即可！
4.新建一个JAVA类
a)右键单击srcnew Class键入类名：BallGame
b)输入代码：
public class BallGame {
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
    }
}
c)运行java程序的三种方式：
i.右键单击Run asjava application
ii.Alt+shift+X，再按J
iii.Ctrl+F11
iv.单击运行按钮
 
 
开始开发我们的小游戏
1.增加窗口
import java.awt.*;
public class BallGame extends Frame {
     
    void launchFrame(){
        setSize(500, 300);
        setLocation(50, 50);
        setVisible(true);
        setTitle("尚学堂---张三作品");
        setBackground(Color.black);
    }
     
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
        new BallGame().launchFrame();
    }
}
 
2.加载图片
在项目下新建images文件夹，将sun.jpg拷贝到images下面
 
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image sun = Toolkit.getDefaultToolkit().getImage("images/sun.jpg"); //这种写法并不好，但是是最简单的！
     
    public void paint(Graphics g){
        g.drawImage(sun, 100, 100, null);
    }
     
    void launchFrame(){
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("尚学堂---张三作品");
        setBackground(Color.black);
        setVisible(true);
    }
     
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
        new BallGame().launchFrame();
    }
}
注意：运行时，第一次打开窗口看不到图片。需要将窗口最小化再打开即可看到！
 
3.学习画各种曲线、形状、字符串：
 
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image sun = Toolkit.getDefaultToolkit().getImage("images/sun.jpg"); //这种写法并不好，但是是最简单的！
     
    public void paint(Graphics g){
        g.drawImage(sun, 100, 100, null);
        g.setColor(Color.blue);
        g.drawLine(100, 100, 200, 200);
        g.drawRect(50, 50, 100, 80);
        g.drawOval(50, 50, 100, 80);
        g.setColor(Color.yellow);
        g.drawString("游戏开始啦！！", 80, 80);
[暂时跟我们的游戏无关，但是一些基本的编程知识！]    }
     
    void launchFrame(){
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("尚学堂---张三作品");
        setBackground(Color.black);
        setVisible(true);
    }
     
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
        new BallGame().launchFrame();
    }
}
 
4.增加动画
 
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image sun = Toolkit.getDefaultToolkit().getImage("images/sun.jpg"); //这种写法并不好，但是是最简单的！
    int x=100;
    int y=100;
    public void paint(Graphics g){
        System.out.println("窗口被画了一次！");
        g.drawImage(sun, x, y, null);
        x = x+2;
    }
     
    void launchFrame(){
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("尚学堂---张三作品");
        setBackground(Color.black);
        setVisible(true);
        new PaintThread().start();
    }
     
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
        new BallGame().launchFrame();
    }
 
    class PaintThread extends Thread {
        public void run(){
            while(true){
                repaint(); //重画窗口！
                try{
                    Thread.sleep(40); //40ms 1s=1000ms
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
 
5.通过我们掌握的数学函数(抛物线、正弦曲线、椭圆等)，控制游戏中物体的运动！
 
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image sun = Toolkit.getDefaultToolkit().getImage("images/sun.jpg"); //这种写法并不好，但是是最简单的！
    double x=100;
    double y=100;
    double degree = 0;
    public void paint(Graphics g){
        System.out.println("窗口被画了一次！");
        g.drawImage(sun, (int)x,(int)y, null);
        x =150+ 100*Math.cos(degree);
        y = 150+100*Math.sin(degree);
        degree = degree + 0.1;
    }
     
    void launchFrame(){
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("尚学堂---张三作品");
        setBackground(Color.black);
        setVisible(true);
        new PaintThread().start();
    }
     
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
        new BallGame().launchFrame();
    }
 
    class PaintThread extends Thread {
        public void run(){
            while(true){
                repaint(); //重画窗口！
                try{
                    Thread.sleep(40); //40ms 1s=1000ms
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
 
6.实现台球的运动！
 
import java.awt.*;
 
public class BallGame extends Frame {
     
    Image sun = Toolkit.getDefaultToolkit().getImage("images/sun.jpg"); //这种写法并不好，但是是最简单的！
    double x=100;
    double y=100;
    double degree = 3.14/3;
    public void paint(Graphics g){
        System.out.println("窗口被画了一次！");
        g.drawImage(sun, (int)x,(int)y, null);
        x = x+ 10*Math.cos(degree);
        y = y+10*Math.sin(degree);
         
        if(y>300-30){
            degree = - degree;
        }
        if(x>500-30){
            degree = 3.14-degree;
        }
        if(x<0){
            degree = 3.14-degree;
        }
        if(y<30){
            degree = -degree;
        }
    }
     
    void launchFrame(){
        setSize(500, 300);
        setLocation(50, 50);
        setTitle("尚学堂---张三作品");
        setBackground(Color.black);
        setVisible(true);
        new PaintThread().start();
    }
     
    public static void main(String[] args){
        System.out.println("我是尚学堂的高淇！");
        new BallGame().launchFrame();
    }
 
    class PaintThread extends Thread {
        public void run(){
            while(true){
                repaint(); //重画窗口！
                try{
                    Thread.sleep(40); //40ms 1s=1000ms
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
 
7.通过键盘来控制物体的运动！