using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace WindowsFormsApplication1
{
	public partial class Form1 : Form
	{
		public Form1()
		{
			InitializeComponent();

		}

		private void pictureBox1_Click(object sender, EventArgs e)
		{
			int halfparts = 9;
			pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
			Bitmap b = (pictureBox1.Image as Bitmap);
			Graphics g = Graphics.FromImage(b);
			g.SmoothingMode = SmoothingMode.AntiAlias;
			g.FillRectangle(Brushes.Black, 0, 0, pictureBox1.Width, pictureBox1.Height);
			List<PointF> topPoints = new List<PointF>();
			List<PointF> bottomPoints = new List<PointF>();
			Pen greenPen = new Pen(Brushes.Green, 2);

			Matrix m = new Matrix();
			m.RotateAt(15, new PointF(100, 100));

			for (int i = 0; i < (2*halfparts)+1; i++)
			{
				double theta = 17 + i * 2.0 * Math.PI / (2 * halfparts);
				PointF p = new PointF((float)Math.Cos(theta), (float)Math.Sin(theta));
				PointF topP = new PointF();
				topP.X = (float)((p.X + 2) * 100.0);
				topP.Y = (float)((p.Y + 1.25) * 40.0);
				topPoints.Add(topP);

				PointF bottomP = new PointF();
				bottomP.X = (float)((p.X * 85.0) + 200);
				bottomP.Y = (float)((p.Y + 3.5) * 50.0);
				bottomPoints.Add(bottomP);
			}

			PointF[] top = topPoints.ToArray();
			m.TransformPoints(top);
			topPoints.Clear();
			topPoints.AddRange(top);

			PointF[] bottom = bottomPoints.ToArray();
			m.TransformPoints(bottom);
			bottomPoints.Clear();
			bottomPoints.AddRange(bottom);

			for (int i = 1; i < (2 * halfparts) + 1; i++)
			{
				g.DrawLine(greenPen, topPoints[i - 1], topPoints[i]);
				g.DrawLine(greenPen, bottomPoints[i - 1], bottomPoints[i]);
				g.DrawLine(greenPen, bottomPoints[i], topPoints[i]);
			}
			for (int i = 0; i < halfparts; i++)
			{
				g.DrawLine(greenPen, topPoints[i], topPoints[i + halfparts]);
				g.DrawLine(greenPen, bottomPoints[i], bottomPoints[i + halfparts]);
			}
		
		}
	}
}