点点绘画器（笑）gui练习

画笔

package com.lean.paint;

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

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);
        windowClose(this);
    }
    //关闭窗口
    public static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
    //画笔
    @Override
    public void paint(Graphics g){
        //画笔需要有颜色，画笔可以画画
        //g.setColor(Color.red);
        //实心圆
        g.fillOval(100,100,100,100);
        //空心圆
        g.drawOval(300,100,100,100);

        //g.setColor(Color.green);
        g.fillRect(150,200,200,200);

        //养成习惯，画笔用完，将他还原成最初的颜色
    }
}

鼠标监听

目的：想要实现鼠标点击画画

package com.lean.paint;

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

public class TestMouseLinster {
     
    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，需要集合存储这个点
    ArrayList points;
    public MyFrame(String title){
     
        super(title);
        setBounds(200,200,400,400);
        //存鼠标点
        points = new ArrayList<>();
        //鼠标监听器，正对这个窗口
        this.addMouseListener(new MyMouseListener());
        setVisible(true);
        windowClose(this);
    }
    @Override
    public void paint(Graphics g){
     
        //画画，监听事件
        Iterator iterator = points.iterator();
        while (iterator.hasNext()){
     
            Point point = (Point) iterator.next();
            g.setColor(Color.green);
            g.fillOval(point.x,point.y,10,10);
        }

    }
    //添加一个点到我们界面上去
    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 myFrame=(MyFrame)e.getSource();
            //这里我们点击的时候，就会在界面上产生一个点
            //这个点就是鼠标的点
            myFrame.addPaint(new Point(e.getX(),e.getY()));
            //每次点击鼠标都需要重新画一遍
            myFrame.repaint();//刷新
        }

    }
    //关闭窗口
    private static void windowClose(Frame frame){
     
        frame.addWindowListener(new WindowAdapter() {
     
            @Override
            public void windowClosing(WindowEvent e) {
     
                System.exit(0);
            }
        });
    }


}

窗口监听

package com.lean.paint;

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

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

class WindowFrame extends Frame{
     
    public WindowFrame(){
     
        setBackground(Color.red);
        setBounds(100,100,200,200);
        setVisible(true);
        //addWindowListener(new MyWindowLinstener());

        this.addWindowListener(
                //匿名内部类
            new WindowAdapter() {
     
                //关闭窗口
                @Override
                public void windowClosing(WindowEvent e) {
     
                    System.exit(0);
                }


                //窗口激活
                @Override
                public void windowActivated(WindowEvent e) {
     
                    WindowFrame source = (WindowFrame)e.getSource();
                    source.setTitle("主人欢迎回来");
                    System.out.println("WindouwActivated");;
                }


            });
    }



}

键盘监听

package com.lean.paint;

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

//键盘监听
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) {
                //获得键盘按下的键是哪一个键,当前的
                int keyCode =  e.getExtendedKeyCode();//不需要记录这个数值，直接使用他的静态属性 VK_XXX
                if (keyCode == KeyEvent.VK_UP) {
                    System.out.println("你按下了上建");
                }
                //根据按下的不同操作会产生不同的操作
            }
        });
    }
}