如何绘制平滑/圆角/曲线图？(C#)

using System;
using System.Drawing;
using System.Windows.Forms;

public class SmoothCurveForm : Form
{
    public SmoothCurveForm()
    {
        // 设置窗体大小和标题
        this.ClientSize = new Size(400, 300);
        this.Text = "Smooth Curve Example";
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        Graphics g = e.Graphics;

        // 设置绘图样式和属性
        Pen pen = new Pen(Color.Red, 2);
        Brush brush = new SolidBrush(Color.Blue);

        // 绘制平滑曲线
        Point[] points = new Point[]
        {
            new Point(50, 200),
            new Point(100, 100),
            new Point(200, 50),
            new Point(300, 150),
            new Point(350, 100)
        };
        g.DrawCurve(pen, points);

        // 绘制圆角矩形
        Rectangle rect = new Rectangle(100, 150, 200, 100);
        int cornerRadius = 20;
        g.DrawRoundRect(pen, rect, cornerRadius);

        // 绘制贝塞尔曲线
        Point start = new Point(50, 50);
        Point control1 = new Point(100, 100);
        Point control2 = new Point(200, 50);
        Point end = new Point(250, 100);
        g.DrawBezier(pen, start, control1, control2, end);

        // 填充椭圆形
        Rectangle ellipseRect = new Rectangle(300, 200, 100, 100);
        g.FillEllipse(brush, ellipseRect);
    }

    public static void Main()
    {
        Application.Run(new SmoothCurveForm());
    }
}