[feature] Don't forget background colors

[JohnnyErnest]

Use esc[48;2;R;G;Bm to set background colors, maybe the object should be Output.Background.FromRGB(r,g,b)?

Observe the following:

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;

namespace ConsoleColor
{
    public class App
    {
        private const int STD_OUTPUT_HANDLE = -11;
        private const uint ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x0004;
        private const uint DISABLE_NEWLINE_AUTO_RETURN = 0x0008;

        [DllImport("kernel32.dll")]
        private static extern bool GetConsoleMode(IntPtr hConsoleHandle, out uint lpMode);

        [DllImport("kernel32.dll")]
        private static extern bool SetConsoleMode(IntPtr hConsoleHandle, uint dwMode);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern IntPtr GetStdHandle(int nStdHandle);

        [DllImport("kernel32.dll")]
        public static extern uint GetLastError();

        //int[] colorMeta1 = { 0, 85, 170, 255 };
        int[] colorMeta2 = { 0, 43, 85, 127, 170, 213, 255 };

        public class Point
        {
            public int X { get; set; }
            public int Y { get; set; }
        }

        public Point SaveCursor()
        {
            return new Point()
            {
                X = Console.CursorLeft,
                Y = Console.CursorTop
            };
        }

        public void SetCursor(Point point)
        {
            Console.CursorTop = point.Y;
            Console.CursorLeft = point.X;
        }

        public void ConsoleInit()
        {
            var iStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
            if (!GetConsoleMode(iStdOut, out uint outConsoleMode))
            {
                Console.WriteLine("failed to get output console mode");
                Console.ReadKey();
                return;
            }

            outConsoleMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING | DISABLE_NEWLINE_AUTO_RETURN;
            if (!SetConsoleMode(iStdOut, outConsoleMode))
            {
                Console.WriteLine($"failed to set output console mode, error code: {GetLastError()}");
                Console.ReadKey();
                return;
            }
        }

        public App()
        {
            ConsoleInit();

            int length = colorMeta2.Length;
            int index = 0;
            Encoding defaultEncoder = Console.OutputEncoding;
            Console.OutputEncoding = Encoding.UTF8;

            StringBuilder sb = new StringBuilder();
            Console.WriteLine();

            for (int r=0;r<length;r++)
            {
                for(int g=0;g<length;g++)
                {
                    for(int b=0;b<length;b++)
                    {
                        int r2 = colorMeta2[r];
                        int g2 = colorMeta2[g];
                        int b2 = colorMeta2[b];
                        int foregroundColor = (r2 == 255 || g2 == 255 || b2 == 255) ? 0 : 255;
                        string formatted = $"({r2.ToString().PadLeft(3, ' ')},{g2.ToString().PadLeft(3, ' ')},{b2.ToString().PadLeft(3, ' ')})";

                        sb.Append($"\u001b[38;2;{r2};{g2};{b2}m█");

                        sb.Append($"\u001b[38;2;{foregroundColor};{foregroundColor};{foregroundColor}m");
                        sb.Append($"\u001b[48;2;{r2};{g2};{b2}m{formatted}");
                        sb.Append($"\u001b[38;2;{r2};{g2};{b2}m█");

                        sb.Append($"\u001b[38;2;{170};{170};{170}m");
                        sb.Append($"\u001b[48;2;{0};{0};{0}m");
                        index++;
                    }
                    sb.AppendLine();
                }
            }
            sb.AppendLine($"{index} total colors.");
            for (int a = 0x2580; a <= 0x259F; a++)
                sb.Append($"{(char)a}");
            for (int a = 0x25E2; a <= 0x25E5; a++)
                sb.Append($"{(char)a}");
            sb.AppendLine();

            Console.WriteLine(sb.ToString());
            Console.WriteLine(defaultEncoder.EncodingName);

            Console.OutputEncoding = defaultEncoder;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            App app = new App();
        }
    }
}

[riezebosch]

It looks beautiful, but I've no idea what I'm looking at 🤷🏻