osu-lazer/osu.Game.Rulesets.Mania/Objects/Drawables/Pieces/NotePiece.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using OpenTK.Graphics;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
using osu.Game.Graphics;

namespace osu.Game.Rulesets.Mania.Objects.Drawables.Pieces
{
    /// <summary>
    /// Represents the static hit markers of notes.
    /// </summary>
    internal class NotePiece : Container, IHasAccentColour
    {
        private const float head_height = 10;
        private const float head_colour_height = 6;

        private readonly Box colouredBox;

        public NotePiece()
        {
            RelativeSizeAxes = Axes.X;
            Height = head_height;

            Children = new[]
            {
                new Box
                {
                    RelativeSizeAxes = Axes.Both
                },
                colouredBox = new Box
                {
                    Anchor = Anchor.TopCentre,
                    Origin = Anchor.TopCentre,
                    RelativeSizeAxes = Axes.X,
                    Height = head_colour_height,
                    Alpha = 0.2f
                }
            };
        }

        private Color4 accentColour;
        public Color4 AccentColour
        {
            get { return accentColour; }
            set
            {
                if (accentColour == value)
                    return;
                accentColour = value;

                colouredBox.Colour = AccentColour.Lighten(0.9f);
            }
        }
    }
}