【0基础学java】教学日志：项目实战-坦克大战-2

本章概述：本章主要讲了如何让坦克动起来，添加键盘监听事件，每隔50ms刷新窗口自动调用画笔，添加键盘处理，根据箭头的状态来判断坦克的移动方向

目录

目录

本章概述：

一、将坦克坐标定为变量，在paint()方法中修改值，paint被调用后，就可以动起来

二、添加键盘监听事件

1、TankFrame

运行效果

​编辑

三、在主线程每隔50ms刷新窗口，调用repaint()方法，repaint()会自动调用paint(g)

1、TankFrame

2、Main 

运行效果

四、添加键盘处理，根据上下左右箭头的按键状态，判断坦克的移动方向

1、TankFrame

---

---

本章概述：

一、将坦克坐标定为变量，在paint()方法中修改值，paint被调用后，就可以动起来

public class TankFrame extends Frame {

    int x = 200,y=200;

    public TankFrame(){
        setTitle("tank war");
        setSize(800,600);
@ -28,6 +30,8 @@ public class TankFrame extends Frame {
    @Override
    public void paint(Graphics g) {
//        System.out.println("paint");
        g.fillRect(200,200,50,50);
        g.fillRect(x,y,50,50);
        x += 50;
        y += 50;
    }
}

二、添加键盘监听事件

1、TankFrame

 import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

@ -18,6 +20,7 @@ public class TankFrame extends Frame {
        setResizable(false);
        setVisible(true);

        this.addKeyListener(new MyListener());

        addWindowListener(new WindowAdapter() {
            @Override
@ -31,7 +34,21 @@ public class TankFrame extends Frame {
    public void paint(Graphics g) {
//        System.out.println("paint");
        g.fillRect(x,y,50,50);
        x += 50;
        y += 50;
//        x += 50;
//        y += 50;
    }

    class MyListener extends KeyAdapter{
        @Override
        public void keyPressed(KeyEvent e) {
//            System.out.println("pressed");
              x += 50;
              repaint();
        }

        @Override
        public void keyReleased(KeyEvent e) {
            System.out.println("released");
        }
    }
}

运行效果

三、在主线程每隔50ms刷新窗口，调用repaint()方法，repaint()会自动调用paint(g)

1、TankFrame

int x = 200,y=200;

    public TankFrame(){
        setTitle("tank war");
        setSize(800,600);
        setResizable(false);
        setVisible(true);

        this.addKeyListener(new MyListener());

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

    @Override
    public void paint(Graphics g) {
//        System.out.println("paint");
        g.fillRect(x,y,50,50);
//        x += 50;
        x += 50;
//        y += 50;
    }

@ -42,14 +42,14 @@
        @Override
        public void keyPressed(KeyEvent e) {
//            System.out.println("pressed");
              x += 50;
              repaint();
//              x += 50;
//              repaint();
        }

        @Override
        public void keyReleased(KeyEvent e) {
            System.out.println("released");
        }
    }
}

2、Main 

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * @author YuPanpan
 * @version 1.0
 */

public class Main {

    public static void main(String[] args) {
    public static void main(String[] args) throws InterruptedException {
        TankFrame tf = new TankFrame();

        while(true){
            Thread.sleep(50);
            tf.repaint();
        }
    }

}

运行效果

四、添加键盘处理，根据上下左右箭头的按键状态，判断坦克的移动方向

1、TankFrame

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * @author YuPanpan
 * @version 1.0
 */
public class TankFrame extends Frame {

    int x = 200,y=200;


    public TankFrame(){
        setTitle("tank war");
        setSize(800,600);
@ -34,21 +35,41 @@ public class TankFrame extends Frame {
    public void paint(Graphics g) {
//        System.out.println("paint");
        g.fillRect(x,y,50,50);
        x += 50;
//        x += 10;
//        y += 50;
    }

    class MyListener extends KeyAdapter{

        boolean bL = false;
        boolean bU = false;
        boolean bR = false;
        boolean bD = false;
        @Override
        public void keyPressed(KeyEvent e) {
//            System.out.println("pressed");
//              x += 50;
//              repaint();
            int key = e.getKeyCode();
            switch(key){
                case KeyEvent.VK_LEFT:
                    bL = true;
                    break;
                case KeyEvent.VK_UP:
                    bU = true;
                    break;
                case KeyEvent.VK_RIGHT:
                    bR = true;
                    break;
                case KeyEvent.VK_DOWN:
                    bD = true;
                    break;
                    default:
                        break;
            }
        }

        @Override
        public void keyReleased(KeyEvent e) {
            System.out.println("released");
//            System.out.println("released");
        }
    }
}