单击按钮在面板中绘制一个可调整大小的矩形

如何解决单击按钮在面板中绘制一个可调整大小的矩形

我是 Java Swing 的新手。我试图在面板中绘制一个可调整大小的矩形，就好像我点击了一个红色按钮一样，它应该在红色面板中绘制一个可调整大小的矩形，绿色按钮和蓝色按钮也是如此，但动作侦听器有效，形状没有在面板中显示

以下是可调整大小的组件类

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Rectangle2D;


// it is resizable component code

class ResizableComponent extends JPanel {

    private int SIZE = 8;
    private Rectangle2D[] points = {new Rectangle2D.Double(50,50,SIZE,SIZE),new Rectangle2D.Double(150,100,SIZE)};
    Rectangle2D s = new Rectangle2D.Double();
    ShapeResizeHandler ada = new ShapeResizeHandler();

    public ResizableComponent() {
        addMouseListener(ada);
        addMouseMotionListener(ada);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D) g;

        for (int i = 0; i < points.length; i++) {
            g2.fill(points[i]);
        }
        s.setRect(points[0].getCenterX(),points[0].getCenterY(),Math.abs(points[1].getCenterX() - points[0].getCenterX()),Math.abs(points[1].getCenterY() - points[0].getCenterY()));

        g2.draw(s);
    }

    class ShapeResizeHandler extends MouseAdapter {

        Rectangle2D r = new Rectangle2D.Double(0,SIZE);
        private int pos = -1;

        public void mousepressed(MouseEvent event) {
            Point p = event.getPoint();

            for (int i = 0; i < points.length; i++) {
                if (points[i].contains(p)) {
                    pos = i;
                    return;
                }
            }
        }

        public void mouseReleased(MouseEvent event) {
            pos = -1;
        }

        public void mouseDragged(MouseEvent event) {
            if (pos == -1) {
                return;
            }

            points[pos].setRect(event.getPoint().x,event.getPoint().y,points[pos].getWidth(),points[pos].getHeight());
            System.out.println("x : " + event.getPoint().x);
            System.out.println("y : " + event.getPoint().y);
            System.out.println("w : " + points[pos].getWidth());
            System.out.println("h : " + points[pos].getHeight());
            repaint();
        }
    }
}

以下是绘制框架和面板的绘图类

public class Drawing extends JFrame{

    public static void main(String[] args) {
        
        Drawing d= new Drawing();

        d.setSize(1000,800);
        d.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        d.setVisible(true);
        d.setLayout(null);

        JPanel redPanel = new JPanel();
        redPanel.setBounds(0,300,700);
        redPanel.setBackground(Color.red);

        JPanel greenPanel = new JPanel();
        greenPanel.setBounds(300,400,700);
        greenPanel.setBackground(Color.green);

        JPanel bluePanel = new JPanel();
        bluePanel.setBounds(700,700);
        bluePanel.setBackground(Color.blue);

        JPanel yellowPanel = new JPanel();
        yellowPanel.setBounds(0,700,1000,100);
        yellowPanel.setBackground(Color.yellow);

        JTextField tf =new JTextField("Default",30);
        tf.setEditable(false);
        
        JButton redButton = new JButton("red");
        
        JButton greenButton = new JButton("Green");

        JButton blueButton = new JButton("Blue");

        yellowPanel.add(tf);
        yellowPanel.add(redButton);
        yellowPanel.add(greenButton);
        yellowPanel.add(blueButton);

        d.add(redPanel);
        d.add(greenPanel);
        d.add(bluePanel);
        d.add(yellowPanel);

        redButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                redPanel.add(new ResizableComponent());
                redPanel.repaint();
                String s = e.getActionCommand();
                System.out.println(s + " Clicked");
            }
        });

        greenButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                greenPanel.add(new ResizableComponent());
                greenPanel.repaint();
                String s = e.getActionCommand();
                System.out.println(s + " Clicked");
            }
        });

        blueButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                bluePanel.add(new ResizableComponent());
                bluePanel.repaint();
                String s = e.getActionCommand();
                System.out.println(s + " Clicked");
            }
        });
    }
}