在Java中以特定角度绘制一条线

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

public class LineDrawingExample extends JPanel {
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g;

        // 设置绘图颜色
        g2d.setColor(Color.BLACK);

        // 将坐标系旋转45度
        double angle = Math.toRadians(45);
        g2d.rotate(angle);

        // 绘制一条线
        int x1 = 50;
        int y1 = 50;
        int x2 = 200;
        int y2 = 50;
        g2d.drawLine(x1, y1, x2, y2);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Line Drawing Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 400);

        LineDrawingExample panel = new LineDrawingExample();
        frame.add(panel);

        frame.setVisible(true);
    }
}