在翻转的Java坐标中绘制

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

public class FlipCoordinateExample extends JFrame {
    public FlipCoordinateExample() {
        setTitle("Flip Coordinate Example");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }

    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D) g;

        // 设置翻转坐标系
        g2d.translate(0, getHeight());
        g2d.scale(1, -1);

        // 在翻转的坐标系中绘制图形
        g2d.setColor(Color.RED);
        g2d.fillRect(100, 100, 200, 200);

        g2d.setColor(Color.BLUE);
        g2d.drawLine(50, 50, 350, 350);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            FlipCoordinateExample example = new FlipCoordinateExample();
            example.setVisible(true);
        });
    }
}