用java编写一个跳动的心型代码

以下用Java Swing编写的跳动的心型代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class HeartBeat extends JPanel implements ActionListener {
    private static final int WIDTH = 400;
    private static final int HEIGHT = 400;
    private static final int DELAY = 10;
    private static final int POINTS = 100;
    private static final int RADIUS = 150;
    private Timer timer;
    private int[] xPoints;
    private int[] yPoints;
    private int angle = 0;
    private int direction = 1;

    public HeartBeat() {
        setPreferredSize(new Dimension(WIDTH, HEIGHT));
        timer = new Timer(DELAY, this);
        timer.start();
    }

    private void calculatePoints() {
        xPoints = new int[POINTS];
        yPoints = new int[POINTS];

        for (int i = 0; i < POINTS; i++) {
            double theta = 2 * Math.PI * i / POINTS;
            double x = RADIUS * (16 * Math.pow(Math.sin(theta), 3));
            double y = -RADIUS * (13 * Math.cos(theta) - 5 * Math.cos(2 * theta) - 2 * Math.cos(3 * theta) - Math.cos(4 * theta));
            xPoints[i] = (int) x + WIDTH / 2;
            yPoints[i] = (int) y + HEIGHT / 2;
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        angle += direction;
        if (angle >= 180 || angle <= 0) {
            direction *= -1;
        }
        repaint();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g.create();
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        calculatePoints();

        g2d.setColor(Color.RED);
        g2d.rotate(Math.toRadians(angle), WIDTH / 2, HEIGHT / 2);
        g2d.fillPolygon(xPoints, yPoints, POINTS);
        g2d.rotate(Math.toRadians(-angle), WIDTH / 2, HEIGHT / 2);

        g2d.dispose();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Heartbeat");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new HeartBeat());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

这个代码使用了心形曲线的极坐标方程，并通过旋转来实现心形的跳动效果。