Ellipse with DrawLines : Curve : Graphics C# Source Code

    
 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class PolyEllipse: Form
{
     public static void Main()
     {
          Application.Run(new PolyEllipse());
     }
     public PolyEllipse()
     {
          Text = "Ellipse with DrawLines";
          ResizeRedraw = true;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          int      iNum = 2 * (cx + cy);
          PointF[] aptf = new PointF[iNum];
   
          for (int i = 0; i < iNum; i++)
          {
               double dAng = i * 2 * Math.PI / (iNum - 1);
   
               aptf[i].X = (cx - 1) / 2f * (1 + (float)Math.Cos(dAng));
               aptf[i].Y = (cy - 1) / 2f * (1 + (float)Math.Sin(dAng));
          }
          grfx.DrawLines(new Pen(clr), aptf);
     }
}