System.Drawing.Drawing2D.GraphicsPath.AddLines C# (CSharp) Method

        public void AddLines(Point [] points)
        {
            if (points == null)
                throw new ArgumentNullException ("points");
            if (points.Length == 0)
                throw new ArgumentException ("points");

            /* only the first point can be compressed (i.e. removed if identical to previous) */
            for (int i = 0, count = points.Length; i < count; i++)
                Append (points [i].X, points [i].Y, PathPointType.Line, (i == 0));
        }

		private void DrawPointerDown(Graphics g)
		{
			Point[] points = new Point[] { new Point(ThumbBounds.Left + (ThumbBounds.Width / 2), ThumbBounds.Bottom - 1), new Point(ThumbBounds.Left, (ThumbBounds.Bottom - (ThumbBounds.Width / 2)) - 1), ThumbBounds.Location, new Point(ThumbBounds.Right - 1, ThumbBounds.Top), new Point(ThumbBounds.Right - 1, (ThumbBounds.Bottom - (ThumbBounds.Width / 2)) - 1), new Point(ThumbBounds.Left + (ThumbBounds.Width / 2), ThumbBounds.Bottom - 1) };
			GraphicsPath path = new GraphicsPath();
			path.AddLines(points);
			Region region = new Region(path);
			g.Clip = region;

			if (ThumbState == 3 || !base.Enabled)
				ControlPaint.DrawButton(g, ThumbBounds, ButtonState.All);
			else
				g.Clear(SystemColors.Control);

			g.ResetClip();
			region.Dispose();
			path.Dispose();
			Point[] pointArray2 = new Point[] { points[0], points[1], points[2], points[3] };
			g.DrawLines(SystemPens.ControlLightLight, pointArray2);
			pointArray2 = new Point[] { points[3], points[4], points[5] };
			g.DrawLines(SystemPens.ControlDarkDark, pointArray2);
			points[0].Offset(0, -1);
			points[1].Offset(1, 0);
			points[2].Offset(1, 1);
			points[3].Offset(-1, 1);
			points[4].Offset(-1, 0);
			points[5] = points[0];
			pointArray2 = new Point[] { points[0], points[1], points[2], points[3] };
			g.DrawLines(SystemPens.ControlLight, pointArray2);
			pointArray2 = new Point[] { points[3], points[4], points[5] };
			g.DrawLines(SystemPens.ControlDark, pointArray2);
		}