Geometric Art using Triangles (C#)

// experimenting with math generated graphics
// MS Visual C# .NET  by  vegaseat  16mar2005
//
// this is a Windows Application

using System;
using System.Drawing;
using System.Runtime.InteropServices;  // DllImport()
using System.Windows.Forms;

namespace DrawSpokes1
{
	public class Form1 : System.Windows.Forms.Form
	{
    // WinApi Sleep() is in kernel32.dll  
    [DllImport("kernel32")]
    private static extern void Sleep(uint dwMilliseconds);

		public Form1()
		{
			InitializeComponent();
		}

		#region Windows Form Designer generated code
		private void InitializeComponent()
		{
      // 
      // Form1
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
      this.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(224)), ((System.Byte)(192)));
      this.ClientSize = new System.Drawing.Size(640, 344);
      this.Name = "Form1";
      this.Text = "Draw Spokes ...";
      this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }
		#endregion

		static void Main() 
		{
			Application.Run(new Form1());
		}

    private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
      // note: using() calls dispose automatically
      using (Pen p = new Pen(Brushes.Green,1))
      {
        int k, x, y;
        int spokes;  // triangle = 3,  more complex > 3

        for (k = 3; k < 12; k++)
        {
          spokes = k;
          this.Text = "Draw Spokes = " + spokes;
          double radians = 360 / (spokes * 57.29578);
          for (x = 1; x <= spokes; x++) 
          {
            for (y = x; y <= spokes; y++) 
            {
              e.Graphics.DrawLine(p,(int)(Math.Sin(y * radians) * 225 + 320),
                (int)(Math.Cos(y * radians) * 145 + 150),
                (int)(Math.Sin(x * radians) * 225 + 320),
                (int)(Math.Cos(x * radians) * 145 + 150));
            }
          }
          Sleep(3000);
        }
      }
      this.Text = "Done! Is there a heart in there?";
    }
	}
}