BezierArt.cs

  //---------------------------------------------
  // BezierArt.cs (C) 2001 by Charles Petzold
  //---------------------------------------------
  using System;
  using System.Drawing;
  using System.Windows.Forms;

  class BezierArt: PrintableForm
  {
      const int iNum = 100;

      public new static void Main()
      {
          Application.Run(new BezierArt());
      }
      public BezierArt()
      {
          Text = "Bezier Art";
      }
      protected override void DoPage(Graphics grfx, Color clr, int cx, int cy)
      {
          Pen      pen  = new Pen(clr);
          PointF[] aptf = new PointF[4];

          for (int i = 0; i < iNum; i++)
          {
              double dAngle = 2 * i * Math.PI / iNum;

              aptf[0].X =     cx / 2 + cx /  2 * (float) Math.Cos(dAngle);
              aptf[0].Y = 5 * cy / 8 + cy / 16 * (float) Math.Sin(dAngle);

              aptf[1] = new PointF(cx / 2,    -cy);
              aptf[2] = new PointF(cx / 2, 2 * cy);

              dAngle += Math.PI;

              aptf[3].X = cx / 2 + cx /  4 * (float) Math.Cos(dAngle);
              aptf[3].Y = cy / 2 + cy / 16 * (float) Math.Sin(dAngle);

              grfx.DrawBeziers(pen, aptf);
          }
      }
  }