Anonymous

using System;
using System.Drawing;
using System.Collections.Generic;
using System.Text;

namespace SomeCompanyName
{
	public static class Gfx
	{
		/// <summary>
		/// Draws a border around a rectangle maximising the width of the pen
		/// to make the border as large as the pen width.
		/// </summary>
		/// <remarks>
		/// The reason we faff around with drawing the border at an offset to the pen width
		/// is to ensure the border is infact drawn at the size of the pen.
		/// If you have a Pen width of 6 and you just perform DrawRectangle on the ClientRectangle
		/// you'll actually get a border of 3 as the width of the pen is from the central point
		/// it draws (so the other 3 is drawn OFF screen).
		/// 
		/// The reason we minus one from the end of the width and height is due to CE
		/// performing DrawRectangle as rect inclusive (counting zero as 1).
		/// See: http://blogs.msdn.com/oldnewthing/archive/2004/02/18/75652.aspx for further information.
		/// </remarks>
		/// <param name="graphics"></param>
		/// <param name="rect"></param>
		/// <param name="pen"></param>
		public static void PaintBorderAroundRectangle(Graphics graphics, Rectangle rect, Pen pen)
		{
			int offSet = (int)Math.Round(pen.Width / 2);
			// outline
			graphics.DrawRectangle(pen, new Rectangle(
				rect.X + offSet,
				rect.Y + offSet,
				rect.Width - (offSet * 2) - 1,
				rect.Height - (offSet * 2) - 1));
		}
	}
}