internal void Draw(MindFusion.Drawing.IGraphics graphics, Pen pen, Brush brush, Real xoff, Real yoff)
		{
			if (!defined)
				return;

			int c = 0;
			for (int i = 0; i < elements.GetLength(0); ++i)
			{
				ArrowHeadElement el = (ArrowHeadElement)elements[i];
				switch (el)
				{

					case ArrowHeadElement.Line:
					{
						Real x1 = coords[c++] + xoff;
						Real y1 = coords[c++] + yoff;
						Real x2 = coords[c++] + xoff;
						Real y2 = coords[c++] + yoff;

						graphics.DrawLine(pen, new Point(x1, y1), new Point(x2, y2));
					}
						break;

					case ArrowHeadElement.Shape:
					{
						int pts = elements[++i];
						Point[] shape = new Point[pts];				
						for (int j = 0; j < pts; ++j)
						{
							shape[j].X = coords[c++] + xoff;
							shape[j].Y = coords[c++] + yoff;
						}

						graphics.FillPolygon(brush, shape);
						graphics.DrawPolygon(pen, shape);
					}
						break;

					case ArrowHeadElement.Circle:
					{
						Real cx = coords[c++] + xoff;
						Real cy = coords[c++] + yoff;
						Real r = coords[c++];

						graphics.FillEllipse(brush, cx - r, cy - r, 2 * r, 2 * r);
						graphics.DrawEllipse(pen, cx - r, cy - r, 2 * r, 2 * r);
					}			
						break;

				}
			}
		}
		
	internal enum ArrowHeadElement
	{
		/// <summary>
		/// A line element.
		/// </summary>
		Line,

		/// <summary>
		/// A polygonal shape.
		/// </summary>
		Shape,

		/// <summary>
		/// A circle element.
		/// </summary>
		Circle
	};