N2Oxide ProgressBar [C# - GDI]

Code:
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace N2Oxide
{
	class N2OxideProgBar : ProgressBar
	{
		private const int MaxHeight = 18;
		private const int CurvePadding = 4;
		private const int IndicatorPadding = 5;
		private const int DispOffset = 40;

		private readonly Color _bgCrossColor = Color.FromArgb(20, 20, 20);
		private readonly Color _bgBottomShineColor = Color.FromArgb(45, 255, 255, 255);
		private readonly Color _indicatorColor = Color.FromArgb(255, 45, 255, 150);
		private const int IndicatorAlpha = 215;

		public N2OxideProgBar()
		{
			DoubleBuffered = true;
			Size = new Size(120, MaxHeight);
			SetStyle(ControlStyles.UserPaint, true);
			SetStyle(ControlStyles.ResizeRedraw, true);
			SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
			SetStyle(ControlStyles.SupportsTransparentBackColor, true);
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e);
			BackColor = Color.Transparent;
			e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

			using (GraphicsPath gp = new GraphicsPath())
			{
				// Draw Background Bottom Shine
				gp.AddLine(new Point(CurvePadding, 1), new Point(Width - CurvePadding, 1));
				gp.AddCurve(new[] { new Point(Width - CurvePadding, 1), new Point(Width, Height / 2 - 1), new Point(Width - CurvePadding, Height) }, 1.2f);
				gp.AddLine(new Point(Width - CurvePadding, Height), new Point(CurvePadding, Height));
				gp.CloseFigure();

				e.Graphics.SetClip(gp);

				using (SolidBrush sb = new SolidBrush(_bgBottomShineColor))
					e.Graphics.FillPath(sb, gp);

				gp.Reset();

				// Draw Background Dark Gradient
				gp.AddLine(new Point(CurvePadding, 0), new Point(Width - CurvePadding, 0));
				gp.AddCurve(new[] { new Point(Width - CurvePadding, 0), new Point(Width, Height / 2 - 1), new Point(Width - CurvePadding, Height - 2) }, 1.2f);
				gp.AddLine(new Point(Width - CurvePadding, Height - 2), new Point(CurvePadding, Height - 2));
				gp.CloseFigure();

				using (HatchBrush hg = new HatchBrush(HatchStyle.DarkDownwardDiagonal, _bgCrossColor))
					e.Graphics.FillPath(hg, gp);

				gp.Reset();

				// Draw Front Progress Indicator
				double progressPercent = (double)Value / Maximum;
				using (LinearGradientBrush lgb = new LinearGradientBrush(new Rectangle(0, IndicatorPadding / 2 + 1, Width, Height), Color.FromArgb(IndicatorAlpha, _indicatorColor), Color.FromArgb(200, 0, 0, 0), 90f))
				{
					if (progressPercent > 0)
					{
						gp.AddLine(new Point(DispOffset + 2, IndicatorPadding),
								   new Point((int)((Width - DispOffset) * progressPercent) - IndicatorPadding + DispOffset, IndicatorPadding));
						gp.AddCurve(
								new[]
								{
									new Point((int)((Width - DispOffset) * progressPercent) - IndicatorPadding - CurvePadding + DispOffset, IndicatorPadding),
									new Point((int)((Width - DispOffset) * progressPercent) - IndicatorPadding + DispOffset, Height / 2),
									new Point((int)((Width - DispOffset) * progressPercent) - IndicatorPadding - CurvePadding + DispOffset, Height - IndicatorPadding)
								}, 1.2f);
						gp.AddLine(new Point((int)((Width - DispOffset) * progressPercent) - IndicatorPadding + DispOffset, Height - IndicatorPadding),
								   new Point(DispOffset + 2, Height - IndicatorPadding));
						gp.CloseFigure();
						e.Graphics.FillPath(lgb, gp);
					}
					gp.Reset();
					gp.AddRectangle(new Rectangle(DispOffset, 0, 2, Height - 2));
					gp.CloseFigure();
					e.Graphics.FillPath(lgb, gp);
				}
				e.Graphics.ResetClip();

				// Draw Percent Display
				string percent = Value + "%";
				SizeF fontSize = e.Graphics.MeasureString(percent, Font);
				e.Graphics.DrawString(percent, Font, Brushes.LightGray, 5, Height / 2 - fontSize.Height / 2);
			}

		}

		protected override void OnResize(EventArgs e)
		{
			base.OnResize(e);
			Size = new Size(Size.Width, MaxHeight);
		}
	}
}