Java（GUI编程02）

参考视频：10、画笔paint（狂神）

示例一：

package com.zach.lesson03;

import java.awt.*;

public class TestPaint {
    public static void main(String[] args) {
        new MyPaint().loadframe();
    }
}

class MyPaint extends frame{

    public void loadframe(){
        setBounds(200,200,600,500);
        setVisible(true);
    }

    //画笔
    @Override
    public void paint(Graphics g) {
//        super.paint(g);
        //画笔，要有颜色，可以画画
//        g.setColor(Color.RED);
//        g.drawOval(100,100,100,100);
        g.fillOval(100,100,100,100);//实心圆

//        g.setColor(Color.GREEN);
        g.fillRect(200,200,200,200);

        //养成习惯，画笔用完，将它还原到最初分颜色
    }
}

示例一：

package com.zach.lesson03;

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;

public class TestMouseListener {
    public static void main(String[] args) {
        new Myframe("画图");
    }
}

//自己的类
class Myframe extends frame{
    //画画需要画笔，需要监听鼠标当前的位置，需要集合来存储这个点
    ArrayList points;

    public Myframe(String title){
        super(title);
        setBounds(200,200,400,300);
        //存鼠标点击的点
        points = new ArrayList<>();

        setVisible(true);

        //鼠标监听器，针对这个窗口
        this.addMouseListener(new MyMouseListener());

    }

    @Override
    public void paint(Graphics g) {
        //画图，监听鼠标的事件
        Iterator iterator = points.iterator();
        while (iterator.hasNext()){
            Point point = (Point) iterator.next();
            g.setColor(Color.BLUE);
            g.fillOval(point.x,point.y,10,10);
        }
    }

    //添加一个点到界面上
    public void addPaint(Point point){
        points.add(point);
    }

    //适配器模式
    private class MyMouseListener extends MouseAdapter{
        //鼠标：按下，弹起，按住不放

        @Override
        public void mousePressed(MouseEvent e) {
            Myframe frame = (Myframe) e.getSource();
            //这里我们点击的时候，就会在界面上产生一个点！画出来
            //这个点就是鼠标的点；
            frame.addPaint(new Point(e.getX(),e.getY()));

            //每次点击鼠标都需要重新画一遍
            frame.repaint();//刷新
        }
    }
}

示例一：

package com.zach.lesson03;

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

public class TestWindow {
    public static void main(String[] args) {
        new Windowframe();
    }
}

class Windowframe extends frame {
    public Windowframe(){
        setBackground(Color.blue);
        setBounds(100,100,200,200);
        setVisible(true);
//        addWindowListener(new MyWindowListen());

        this.addWindowListener(
                //匿名内部类
                new WindowAdapter() {
                    //关闭窗口
                    @Override
                    public void windowClosing(WindowEvent e) {
                        System.out.println("窗口关闭中");
                        System.exit(0);
                    }
                    //激活窗口
                    @Override
                    public void windowActivated(WindowEvent e) {
                        Windowframe source = (Windowframe) e.getSource();
                        source.setTitle("已被激活");
                        System.out.println("窗口已激活");
                    }

                    @Override
                    public void windowDeactivated(WindowEvent e) {
                        System.out.println("窗口未激活");
                    }

                }
        );

    }
    
}

示例一：

package com.zach.lesson03;

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

//键
public class TestKeyListener {
    public static void main(String[] args) {
        new Keyframe();
    }
}

class Keyframe extends frame{
    public Keyframe(){
        setBounds(1,2,300,400);
        setVisible(true);

        this.addKeyListener(new KeyAdapter() {
            //键盘按下
            @Override
            public void keyPressed(KeyEvent e) {
                //获得键盘下的键是那一个，当前的码
                int keyCode = e.getKeyCode();//不需要去记录这个数值，直接使用静态属性 VK_XX
                System.out.println(keyCode);
                if (keyCode == KeyEvent.VK_UP){
                    System.out.println("你按下了上键");
                }
            }
        });

    }
}