java 语言 实现一个跳动的心

以下是Java实现一个跳动的心的代码：

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

public class Heart extends JPanel {
    private static final long serialVersionUID = 1L;
    private static final int SIZE = 200;
    private static final int RATE = 30;

    private int x = SIZE / 2;
    private int y = SIZE / 2;
    private int r = SIZE / 3;
    private int t = 0;

    public Heart() {
        Timer timer = new Timer(RATE, e -> {
            t++;
            repaint();
        });
        timer.start();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        // 计算心形曲线
        Path2D path = new Path2D.Double();
        double step = Math.PI / 180;
        double x, y, r;
        for (double theta = 0; theta <= 2 * Math.PI; theta += step) {
            r = this.r * (1 + Math.sin(theta + t * step));
            x = this.x + r * Math.cos(theta);
            y = this.y + r * Math.sin(theta);
            if (theta == 0) {
                path.moveTo(x, y);
            } else {
                path.lineTo(x, y);
            }
        }
        path.closePath();

        // 绘制心形曲线
        g2.setColor(new Color(255, 0, 0));
        g2.fill(path);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Heart");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(SIZE, SIZE);
        frame.setLocationRelativeTo(null);
        frame.setResizable(false);
        frame.setContentPane(new Heart());
        frame.setVisible(true);
    }
}

该程序主要利用了Java的Swing图形库绘制一个跳动的心形曲线。其中，`Heart`类继承自`JPanel`，重写了`paintComponent`方法，在该方法中计算心形曲线的路径，并绘制出来。程序中通过定时器每隔一段时间重新绘制界面，实现心形曲线的跳动效果。最后，利用`main`方法创建一个窗口并将`Heart`添加到其中，运行程序即可看到跳动的心形曲线。