编辑代码

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class RoseFlower extends JPanel {
    private static final long serialVersionUID = 1L;

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        int centerX = getWidth() / 2;
        int centerY = getHeight() / 2;
        int petalCount = 20; // 花瓣数量
        int petalLength = 100; // 花瓣长度

        g.setColor(Color.RED);

        for (int i = 0; i < petalCount; i++) {
            double angle = 2 * Math.PI * i / petalCount;
            int x = (int) (centerX + petalLength * Math.cos(angle));
            int y = (int) (centerY + petalLength * Math.sin(angle));
            g.drawLine(centerX, centerY, x, y);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Rose Flower");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 400);
        frame.setLocationRelativeTo(null);

        RoseFlower flower = new RoseFlower();
        frame.add(flower);

        frame.setVisible(true);
    }
}