围绕 x 轴垂直旋转形状

提供的代码演示了如何旋转多边形，但它不会围绕 x 轴旋转它x 轴。要实现绕 x 轴的垂直旋转，我们可以将多边形旋转 90 度，然后应用所需的弧度旋转。修改后的代码如下：

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

public class RotatingShape extends JPanel implements ActionListener {

    private int[] p1x = {200, 200, 240, 240, 220, 220, 200};
    private int[] p1y = {200, 260, 260, 240, 240, 200, 200};
    private Polygon p1 = new Polygon(p1x, p1y, p1x.length);
    private double theta = 0;
    private double dt = Math.PI / 36; // Rotation speed
    private Timer timer = new Timer(100, this);

    public RotatingShape() {
        this.setPreferredSize(new Dimension(700, 700));
        this.setBackground(Color.white);
        p1.translate(-50,  100);
    }

    @Override
    public void actionPerformed(ActionEvent event) {
        theta  = dt;
        repaint();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        int w = this.getWidth();
        int h = this.getHeight();
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.drawLine(w / 2, 0, w / 2, h);
        g2d.drawLine(0, h / 2, w, h / 2);
        g2d.rotate(Math.PI / 2, w / 2, h / 2); // Rotate 90 degrees to align with x-axis
        g2d.rotate(theta, w / 2, h / 2); // Apply rotation around x-axis
        g2d.drawPolygon(p1);
    }

    public void start() {
        timer.start();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Rotating Shape");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        RotatingShape sl = new RotatingShape();
        frame.add(sl);
        frame.pack();
        frame.setVisible(true);
        sl.start();
    }
}

在此代码中，我们在 PaintComponent 方法中使用 g2d.rotate(Math.PI / 2, w / 2, h / 2) 将多边形旋转 90 度。这会将多边形与 x 轴对齐，允许我们使用 g2d.rotate(theta, w / 2, h / 2).