鼠标监听事件、模拟画图工具

/**
 * @Description 鼠标监听事件、模拟画图工具
 */
package com.ai.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，正对这个窗口
        this.addMouseListener(new MyMouseListener());
    }

    @Override
    public void paint(Graphics g){
        //画画，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();

            //这个我们点击的时候，就会在界面上产生一个点！画

            //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    30帧     60帧
        }
    }
}