System.Windows.Forms.ThemeWin32Classic.DrawBorderInternal C# (CSharp) Method

		private static void DrawBorderInternal (Graphics graphics, float startX, float startY, float endX, float endY,
			int width, Color color, ButtonBorderStyle style, Border3DSide side) {

			Pen pen = null;

			switch (style) {
			case ButtonBorderStyle.Solid:
			case ButtonBorderStyle.Inset:
			case ButtonBorderStyle.Outset:
					pen = ThemeEngine.Current.ResPool.GetDashPen (color, DashStyle.Solid);
					break;
			case ButtonBorderStyle.Dashed:
					pen = ThemeEngine.Current.ResPool.GetDashPen (color, DashStyle.Dash);
					break;
			case ButtonBorderStyle.Dotted:
					pen = ThemeEngine.Current.ResPool.GetDashPen (color, DashStyle.Dot);
					break;
			default:
			case ButtonBorderStyle.None:
					return;
			}

			switch(style) {
			case ButtonBorderStyle.Outset: {
				Color		colorGrade;
				int		hue, brightness, saturation;
				int		brightnessSteps;
				int		brightnessDownSteps;

				ControlPaint.Color2HBS(color, out hue, out brightness, out saturation);

				brightnessDownSteps=brightness/width;
				if (brightness>127) {
					brightnessSteps=Math.Max(6, (160-brightness)/width);
				} else {
					brightnessSteps=(127-brightness)/width;
				}

				for (int i=0; i<width; i++) {
					switch(side) {
					case Border3DSide.Left:	{
						colorGrade=ControlPaint.HBS2Color(hue, Math.Min(255, brightness+brightnessSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX+i, startY+i, endX+i, endY-i);
						break;
					}

					case Border3DSide.Right: {
						colorGrade=ControlPaint.HBS2Color(hue, Math.Max(0, brightness-brightnessDownSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX-i, startY+i, endX-i, endY-i);
						break;
					}

					case Border3DSide.Top: {
						colorGrade=ControlPaint.HBS2Color(hue, Math.Min(255, brightness+brightnessSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX+i, startY+i, endX-i, endY+i);
						break;
					}

					case Border3DSide.Bottom: {
						colorGrade=ControlPaint.HBS2Color(hue, Math.Max(0, brightness-brightnessDownSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX+i, startY-i, endX-i, endY-i);
						break;
					}
					}
				}
				break;
			}

			case ButtonBorderStyle.Inset: {
				Color		colorGrade;
				int		hue, brightness, saturation;
				int		brightnessSteps;
				int		brightnessDownSteps;

				ControlPaint.Color2HBS(color, out hue, out brightness, out saturation);

				brightnessDownSteps=brightness/width;
				if (brightness>127) {
					brightnessSteps=Math.Max(6, (160-brightness)/width);
				} else {
					brightnessSteps=(127-brightness)/width;
				}

				for (int i=0; i<width; i++) {
					switch(side) {
					case Border3DSide.Left:	{
						colorGrade=ControlPaint.HBS2Color(hue, Math.Max(0, brightness-brightnessDownSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX+i, startY+i, endX+i, endY-i);
						break;
					}

					case Border3DSide.Right: {
						colorGrade=ControlPaint.HBS2Color(hue, Math.Min(255, brightness+brightnessSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX-i, startY+i, endX-i, endY-i);
						break;
					}

					case Border3DSide.Top: {
						colorGrade=ControlPaint.HBS2Color(hue, Math.Max(0, brightness-brightnessDownSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX+i, startY+i, endX-i, endY+i);
						break;
					}

					case Border3DSide.Bottom: {
						colorGrade=ControlPaint.HBS2Color(hue, Math.Min(255, brightness+brightnessSteps*(width-i)), saturation);
						pen = ThemeEngine.Current.ResPool.GetPen (colorGrade);
						graphics.DrawLine(pen, startX+i, startY-i, endX-i, endY-i);
						break;
					}
					}
				}
				break;
			}

				/*
					I decided to have the for-loop duplicated for speed reasons;
					that way we only have to switch once (as opposed to have the
					for-loop around the switch)
				*/
			default: {
				switch(side) {
				case Border3DSide.Left:	{
					for (int i=0; i<width; i++) {
						graphics.DrawLine(pen, startX+i, startY+i, endX+i, endY-i);
					}
					break;
				}

				case Border3DSide.Right: {
					for (int i=0; i<width; i++) {
						graphics.DrawLine(pen, startX-i, startY+i, endX-i, endY-i);
					}
					break;
				}

				case Border3DSide.Top: {
					for (int i=0; i<width; i++) {
						graphics.DrawLine(pen, startX+i, startY+i, endX-i, endY+i);
					}
					break;
				}

				case Border3DSide.Bottom: {
					for (int i=0; i<width; i++) {
						graphics.DrawLine(pen, startX+i, startY-i, endX-i, endY-i);
					}
					break;
				}
				}
				break;
			}
			}
		}