package AWT_GameDemo;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GameingDemo {

    // 创建窗口对象
    Frame s = new Frame("BallGame");
    //设置窗口高度宽度
    private final int W_Height=400 ;
    private final int W_Wdith=300 ;
    //球拍高宽
    private final int P_Height=20 ;
    private final int P_Wdith=60;
    //球拍坐标
    private int PX = 130;
    private final int PY = 340;

    //小球高宽
    private final int B_SIZE=16 ;
    //小球坐标
    private int BX = 120;
    private int BY = 20;
    //小球速度
    private int BXV = 10;
    private int BYV = 5;
    //判断游戏是否结束变量
    private boolean isover =false;

    //定义一个定时器（刷新画面用）
    private Timer timer;

    //创建绘画组件
    public class MyCanvas extends Canvas {
        @Override
        public void paint(Graphics g) {
//绘制画面
//游戏结束内容
            if(isover){
                g.setColor(Color.RED);
                g.setFont(new Font("times",Font.BOLD,30));
                g.drawString("GAME OVER",20,200);

            }else{


//游戏中内容
                //绘制小球
                g.setColor(Color.RED);
                g.fillOval(BX,BY,B_SIZE,B_SIZE);
                //绘制球拍
                g.setColor(Color.PINK);
                g.fillRect(PX,PY,P_Wdith,P_Height);

            }
        }}

    MyCanvas myc = new MyCanvas();

    public void mix(){
        //球拍坐标处理逻辑
        KeyListener k = new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                //获取当前按下按钮
                int kc= e.getKeyCode();
                if (kc == KeyEvent.VK_LEFT){
                    if (PX>0){
                        PX-=10;
                    }
                }else if (kc == KeyEvent.VK_RIGHT){
                    if (PX<(W_Wdith-P_Wdith)){
                        PX+=10;
                    }
                }
            }
        };
        //给frame 和画布注册监听
        s.addKeyListener(k);
        myc.addKeyListener(k);
//小球处理逻辑
       ActionListener task = new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent e) {
            //修正速度
               if (BX<=0||BX>W_Wdith-B_SIZE){
                   BXV=-BXV;
               }
               if (BY<=0||(BY>PY-B_SIZE&&BX>PX&&BX<PX+P_Wdith)){
                   BYV=-BYV;
               }
               //游戏状态修正
               if (BY+B_SIZE>PY&&(BX<PX||BX>PX+P_Wdith)){
                   timer.stop();
                   isover = true;
                   myc.repaint();
               }

               //更新小球坐标重汇界面
               BX+=BXV;
               BY+=BYV;
               myc.repaint();
           }
        };
        timer = new Timer(100,task);
        timer.start();
        myc.setPreferredSize(new Dimension(W_Wdith,W_Height));
        s.add(myc);
        s.pack();
        s.setVisible(true);
        s.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }




    public static void main(String[] args) {
        GameingDemo G = new GameingDemo();
        G.mix();

    }
}