osu-lazer/osu.Game/Screens/Play/LetterboxOverlay.cs

// Copyright (c) 2007-2017 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.Graphics;
using osu.Framework.Graphics.Colour;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;

namespace osu.Game.Screens.Play
{
    public class LetterboxOverlay : Container
    {
        private const int letterbox_height = 350;

        private Color4 transparentBlack => new Color4(0, 0, 0, 0);

        public LetterboxOverlay()
        {
            RelativeSizeAxes = Axes.Both;
            Alpha = 0;
            Children = new Drawable[]
            {
                new Container
                {
                    Anchor = Anchor.TopLeft,
                    Origin = Anchor.TopLeft,
                    RelativeSizeAxes = Axes.X,
                    Height = letterbox_height,
                    Child = new Box
                    {
                        RelativeSizeAxes = Axes.Both,
                        Colour = new ColourInfo
                        {
                            TopLeft = Color4.Black,
                            TopRight = Color4.Black,
                            BottomLeft = transparentBlack,
                            BottomRight = transparentBlack,
                        }
                    }
                },
                new Container
                {
                    Anchor = Anchor.BottomLeft,
                    Origin = Anchor.BottomLeft,
                    RelativeSizeAxes = Axes.X,
                    Height = letterbox_height,
                    Child = new Box
                    {
                        RelativeSizeAxes = Axes.Both,
                        Colour = new ColourInfo
                        {
                            TopLeft = transparentBlack,
                            TopRight = transparentBlack,
                            BottomLeft = Color4.Black,
                            BottomRight = Color4.Black,
                        }
                    }
                }
            };
        }
    }
}