Program.cs

using System.Collections.Immutable;
using SFML.Graphics;
using SFML.Window;
using Guit.Domain;
using Guit.Domain.Styles;
using Guit.Application.Core;
using Guit.Application.Factories;
using Guit.Application.Rendering.Core;
using static Guit.Application.Helpers.ColorHelper;
using static Guit.Domain.Note;

Font font = new Font("Merriweather.ttf");

WindowSettings windowSettings = new WindowSettings()
{
    WindowTitle = "Fretboard Application",
    WindowSize = (1200, 800),
    Clear = ColorFromHex("#5A5A5A"),
    WindowStyle = Styles.Close | Styles.Titlebar,
    ContextSettings = new ContextSettings() { AntialiasingLevel = 8 },
};

ImmutableArray<Instrument> instruments =
[
    new Instrument("6-String Guitar (Standard E)",        Frets: 22,    Tune:    [E4, B3, G3, D3, A2, E2]          ),
    new Instrument("6-String Guitar (Drop D)",            Frets: 22,    Tune:    [E4, B3, G3, D3, A2, D2]          ),
    new Instrument("6-String Guitar (DADGAD)",            Frets: 22,    Tune:    [D4, A3, G3, D3, A2, D2]          ),
    new Instrument("7-String Guitar (Standard B)",        Frets: 24,    Tune:    [E4, B3, G3, D3, A2, E2, B1]      ),
    new Instrument("7-String Guitar (Drop A)",            Frets: 24,    Tune:    [E4, B3, G3, D3, A2, E2, A1]      ),
    new Instrument("8-String Guitar (Standard F#)",       Frets: 24,    Tune:    [E4, B3, G3, D3, A2, E2, B1, F1]  ),
    new Instrument("4-String Bass Guitar (Standard E)",   Frets: 24,    Tune:    [G3, D3, A2, E2]                  ),
    new Instrument("5-String Bass Guitar (Standard B)",   Frets: 24,    Tune:    [G3, D3, A2, E2, B1]              ),
    new Instrument("Ukulele (Standard G)",                Frets: 21,    Tune:    [A4, E4, C4, G4]                  ),
    new Instrument("Baritone Ukulele (DGBE)",             Frets: 21,    Tune:    [E4, B3, G3, D3]                  ),
];

ImmutableArray<Scale> scales =
[
    new Scale("Chromatic",          Intervals:   [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]   ),
    new Scale("Ionian",             Intervals:   [0, 2, 4, 5, 7, 9, 11]                   ),
    new Scale("Dorian",             Intervals:   [0, 2, 3, 5, 7, 9, 10]                   ),
    new Scale("Aeolian",            Intervals:   [0, 2, 3, 5, 7, 8, 10]                   ),
    new Scale("Mixolydian",         Intervals:   [0, 2, 4, 5, 7, 9, 10]                   ),
    new Scale("Harmonic minor",     Intervals:   [0, 2, 3, 5, 7, 8, 11]                   ),
    new Scale("Melodic minor",      Intervals:   [0, 2, 3, 5, 7, 9, 11]                   ),
    new Scale("Lydian",             Intervals:   [0, 2, 4, 6, 7, 9, 11]                   ),
    new Scale("Phrygian",           Intervals:   [0, 1, 3, 5, 7, 8, 10]                   ),
    new Scale("Major pentatonic",   Intervals:   [0, 2, 4, 7, 9]                          ),
    new Scale("Minor pentatonic",   Intervals:   [0, 3, 5, 7, 10]                         ),
    new Scale("Blues",              Intervals:   [0, 3, 5, 6, 7, 10]                      ),
    new Scale("Bebop dominant",     Intervals:   [0, 2, 4, 5, 7, 9, 10, 11]               ),
    new Scale("Harmonic major",     Intervals:   [0, 2, 4, 5, 7, 8, 11]                   ),
    new Scale("Lydian augmented",   Intervals:   [0, 2, 4, 6, 8, 9, 11]                   ),
    new Scale("Hungarian Gypsy",    Intervals:   [0, 2, 3, 6, 7, 8, 11]                   ),
    new Scale("Double harmonic",    Intervals:   [0, 1, 4, 5, 7, 8, 11]                   ),
    new Scale("Locrian",            Intervals:   [0, 1, 3, 5, 6, 8, 10]                   ),
    new Scale("Acoustic",           Intervals:   [0, 2, 4, 6, 7, 9, 10]                   ),
];

AppStyle appStyle = AppStyle.GetDefault(font);
AppState appState = new AppState(instruments, scales);
ViewFactory viewFactory = new(appStyle);
new FretboardApplication(windowSettings, viewFactory, appState).OpenRenderWindow();