Aeonhack's Tab Control Converted to C#

//credits to aeonhack
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;


internal class DotNetBarTabcontrol : TabControl
{
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    [DefaultValue(false)]
    private bool _DrawPointer = false;
    public bool DrawPointer
    {
        get
        {
            return _DrawPointer;
        }
        set
        {
            _DrawPointer = value;
        }
    }
    public GraphicsPath RoundRect(Rectangle Rectangle, int Curve)
    {
        GraphicsPath P = new GraphicsPath();
        int ArcRectangleWidth = Curve * 2;
        P.AddArc(new Rectangle(Rectangle.X, Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), -180F, 90F);
        P.AddArc(new Rectangle(Rectangle.Width - ArcRectangleWidth + Rectangle.X, Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), -90F, 90F);
        P.AddArc(new Rectangle(Rectangle.Width - ArcRectangleWidth + Rectangle.X, Rectangle.Height - ArcRectangleWidth + Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), 0F, 90F);
        P.AddArc(new Rectangle(Rectangle.X, Rectangle.Height - ArcRectangleWidth + Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), 90F, 90F);
        P.AddLine(new Point(Rectangle.X, Rectangle.Height - ArcRectangleWidth + Rectangle.Y), new Point(Rectangle.X, Curve + Rectangle.Y));
        return P;
    }
    public GraphicsPath RoundRect(int X, int Y, int Width, int Height, int Curve)
    {
        Rectangle Rectangle = new Rectangle(X, Y, Width, Height);
        GraphicsPath P = new GraphicsPath();
        int ArcRectangleWidth = Curve * 2;
        P.AddArc(new Rectangle(Rectangle.X, Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), -180F, 90F);
        P.AddArc(new Rectangle(Rectangle.Width - ArcRectangleWidth + Rectangle.X, Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), -90F, 90F);
        P.AddArc(new Rectangle(Rectangle.Width - ArcRectangleWidth + Rectangle.X, Rectangle.Height - ArcRectangleWidth + Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), 0F, 90F);
        P.AddArc(new Rectangle(Rectangle.X, Rectangle.Height - ArcRectangleWidth + Rectangle.Y, ArcRectangleWidth, ArcRectangleWidth), 90F, 90F);
        P.AddLine(new Point(Rectangle.X, Rectangle.Height - ArcRectangleWidth + Rectangle.Y), new Point(Rectangle.X, Curve + Rectangle.Y));
        return P;
    }
    public DotNetBarTabcontrol()
    {
        SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw | ControlStyles.UserPaint | ControlStyles.DoubleBuffer, true);
        DoubleBuffered = true;
        SizeMode = TabSizeMode.Fixed;
        ItemSize = new Size(35, 85);
    }
    protected override void CreateHandle()
    {
        base.CreateHandle();
        Alignment = TabAlignment.Left;
    }

    public Pen ToPen(Color color)
    {
        return new Pen(color);
    }

    public Brush ToBrush(Color color)
    {
        return new SolidBrush(color);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        Bitmap B = new Bitmap(Width, Height);
        Graphics G = Graphics.FromImage(B);
        try
        {
            SelectedTab.BackColor = Color.White;
        }
        catch
        {
        }
        G.Clear(Parent.FindForm().BackColor);
        G.FillRectangle(new SolidBrush(Color.FromArgb(96, 110, 121)), new Rectangle(0, 0, ItemSize.Height + 4, Height));
        for (var i = 0; i < TabCount; i++)
        {
            if (i == SelectedIndex)
            {
                Rectangle x2 = new Rectangle(new Point(GetTabRect(i).Location.X - 2, GetTabRect(i).Location.Y - 2), new Size(GetTabRect(i).Width + 3, GetTabRect(i).Height - 1));
                ColorBlend myBlend = new ColorBlend();
                myBlend.Colors = new[] { Color.FromArgb(96, 110, 121), Color.FromArgb(96, 110, 121), Color.FromArgb(96, 110, 121) };
                myBlend.Positions = new[] { 0.0F, 0.5F, 1.0F };
                LinearGradientBrush lgBrush = new LinearGradientBrush(x2, Color.Black, Color.Black, 90.0F);
                lgBrush.InterpolationColors = myBlend;
                G.FillRectangle(lgBrush, x2);
                G.DrawRectangle(new Pen(Color.FromArgb(96, 110, 121)), x2);
                Rectangle tabRect = new Rectangle(GetTabRect(i).Location.X + 4, GetTabRect(i).Location.Y + 2, GetTabRect(i).Size.Width + 10, GetTabRect(i).Size.Height - 11);
                G.FillPath(new SolidBrush(Color.FromArgb(80, 90, 100)), RoundRect(tabRect, 5));
                G.DrawPath(new Pen(Color.FromArgb(67, 77, 87)), RoundRect(new Rectangle(tabRect.X + 1, tabRect.Y + 1, tabRect.Width - 1, tabRect.Height - 2), 5));
                G.DrawPath(new Pen(Color.FromArgb(115, 125, 135)), RoundRect(tabRect, 5));

                G.SmoothingMode = SmoothingMode.HighQuality;

                if (_DrawPointer)
                {
                    Point[] p = new Point[] { new Point(ItemSize.Height - 3, GetTabRect(i).Location.Y + 20), new Point(ItemSize.Height + 4, GetTabRect(i).Location.Y + 14), new Point(ItemSize.Height + 4, GetTabRect(i).Location.Y + 27) };
                    G.FillPolygon(Brushes.White, p);
                    Invalidate();
                }

                if (ImageList != null)
                {
                    try
                    {
                        if (ImageList.Images[TabPages[i].ImageIndex] != null)
                        {

                            G.DrawImage(ImageList.Images[TabPages[i].ImageIndex], new Point(x2.Location.X + 8, x2.Location.Y + 6));
                            G.DrawString("      " + TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), Brushes.White, x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                        }
                        else
                        {
                            G.DrawString(TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), Brushes.White, x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                        }
                    }
                    catch (Exception ex)
                    {
                        G.DrawString(TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), Brushes.White, x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                    }
                }
                else
                {
                    G.DrawString(TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), Brushes.White, x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                }

                G.DrawLine(new Pen(Color.FromArgb(96, 110, 121)), new Point(x2.Location.X - 1, x2.Location.Y - 1), new Point(x2.Location.X, x2.Location.Y));
                G.DrawLine(new Pen(Color.FromArgb(96, 110, 121)), new Point(x2.Location.X - 1, x2.Bottom - 1), new Point(x2.Location.X, x2.Bottom));
            }
            else
            {
                Rectangle x2 = new Rectangle(new Point(GetTabRect(i).Location.X - 2, GetTabRect(i).Location.Y - 2), new Size(GetTabRect(i).Width + 3, GetTabRect(i).Height + 1));
                G.FillRectangle(new SolidBrush(Color.FromArgb(96, 110, 121)), x2);
                G.DrawLine(new Pen(Color.FromArgb(96, 110, 121)), new Point(x2.Right, x2.Top), new Point(x2.Right, x2.Bottom));
                if (ImageList != null)
                {
                    try
                    {
                        if (ImageList.Images[TabPages[i].ImageIndex] != null)
                        {
                            G.DrawImage(ImageList.Images[TabPages[i].ImageIndex], new Point(x2.Location.X + 8, x2.Location.Y + 6));
                            G.DrawString("      " + TabPages[i].Text, Font, Brushes.White, x2, new StringFormat { LineAlignment = StringAlignment.Near, Alignment = StringAlignment.Near });
                        }
                        else
                        {
                            G.DrawString(TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), new SolidBrush(Color.FromArgb(210, 220, 230)), x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                        }
                    }
                    catch (Exception ex)
                    {
                        G.DrawString(TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), new SolidBrush(Color.FromArgb(210, 220, 230)), x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                    }
                }
                else
                {
                    G.DrawString(TabPages[i].Text.ToUpper(), new Font(Font.FontFamily, Font.Size, FontStyle.Bold), new SolidBrush(Color.FromArgb(210, 220, 230)), x2, new StringFormat { LineAlignment = StringAlignment.Center, Alignment = StringAlignment.Center });
                }
            }
            G.FillPath(Brushes.White, RoundRect(new Rectangle(86, 0, Width - 89, Height - 3), 5));
            G.DrawPath(new Pen(Color.FromArgb(65, 75, 85)), RoundRect(new Rectangle(86, 0, Width - 89, Height - 3), 5));
        }

        e.Graphics.DrawImage((Image)B.Clone(), 0, 0);
        G.Dispose();
        B.Dispose();
    }
}