winform根据三维坐标绘制三维曲线代码

以下是用C#编写的WinForm绘制三维曲线的示例代码：

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

namespace ThreeDGraph
{
    public partial class MainForm : Form
    {
        private Graphics g;
        private Point3D[] points = new Point3D[100];
        private int numPoints = 0;

        public MainForm()
        {
            InitializeComponent();
            g = panel1.CreateGraphics();
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            DrawPoints();
            DrawLines();
        }

        private void DrawPoints()
        {
            foreach (Point3D p in points)
            {
                if (p != null)
                {
                    Point screenPoint = ToScreen(p);
                    g.FillEllipse(Brushes.Red, screenPoint.X - 3, screenPoint.Y - 3, 7, 7);
                }
            }
        }

        private void DrawLines()
        {
            if (numPoints > 1)
            {
                Point[] screenPoints = new Point[numPoints];
                for (int i = 0; i < numPoints; i++)
                    screenPoints[i] = ToScreen(points[i]);
                g.DrawCurve(Pens.Blue, screenPoints);
            }
        }

        private Point ToScreen(Point3D p)
        {
            double x = p.X - panel1.Width / 2;
            double y = p.Y - panel1.Height / 2;
            double z = p.Z;
            double k = 1000 / (1000 + z);
            int screenX = (int)(panel1.Width / 2 + x * k);
            int screenY = (int)(panel1.Height / 2 + y * k);
            return new Point(screenX, screenY);
        }

        private void panel1_MouseClick(object sender, MouseEventArgs e)
        {
            if (numPoints < points.Length)
            {
                double x = e.X - panel1.Width / 2;
                double y = e.Y - panel1.Height / 2;
                double z = 0;
                Point3D p = new Point3D(x, y, z);
                points[numPoints++] = p;
                panel1.Invalidate();
            }
        }
    }

    public class Point3D
    {
        public double X, Y, Z;

        public Point3D(double x, double y, double z)
        {
            X = x;
            Y = y;
            Z = z;
        }
    }
}

此代码使用 `Point3D` 类来表示三维坐标点，使用 `ToScreen` 方法将三维坐标转换为屏幕坐标。在 `panel1_MouseClick` 事件处理程序中，单击鼠标添加一个新的三维点，并在 `panel1_Paint` 事件处理程序中绘制点和曲线。注意，此代码只支持单色曲线绘制，如果需要使用多个颜色绘制曲线，需要使用更复杂的算法来计算曲线上每个点的颜色。