osu/osu.Game/Screens/Play/HUD/BPMCounter.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Localisation;
using osu.Game.Beatmaps;
using osu.Game.Graphics;
using osu.Game.Graphics.Sprites;
using osu.Game.Graphics.UserInterface;
using osu.Game.Skinning;
using osuTK;

namespace osu.Game.Screens.Play.HUD
{
    public partial class BPMCounter : RollingCounter<double>, ISerialisableDrawable
    {
        protected override double RollingDuration => 750;

        [Resolved]
        private IBindable<WorkingBeatmap> beatmap { get; set; } = null!;

        [Resolved]
        private IGameplayClock gameplayClock { get; set; } = null!;

        [BackgroundDependencyLoader]
        private void load(OsuColour colour)
        {
            Colour = colour.BlueLighter;
            Current.Value = DisplayedCount = 0;
        }

        protected override void Update()
        {
            base.Update();

            // We want to check Rate every update to cover windup/down
            Current.Value = beatmap.Value.Beatmap.ControlPointInfo.TimingPointAt(gameplayClock.CurrentTime).BPM * gameplayClock.GetTrueGameplayRate();
        }

        protected override OsuSpriteText CreateSpriteText()
            => base.CreateSpriteText().With(s => s.Font = s.Font.With(size: 20f, fixedWidth: true));

        protected override LocalisableString FormatCount(double count)
        {
            return $@"{count:0}";
        }

        protected override IHasText CreateText() => new TextComponent();

        private partial class TextComponent : CompositeDrawable, IHasText
        {
            public LocalisableString Text
            {
                get => text.Text;
                set => text.Text = value;
            }

            private readonly OsuSpriteText text;

            public TextComponent()
            {
                AutoSizeAxes = Axes.Both;

                InternalChild = new FillFlowContainer
                {
                    AutoSizeAxes = Axes.Both,
                    Spacing = new Vector2(2),
                    Children = new Drawable[]
                    {
                        text = new OsuSpriteText
                        {
                            Anchor = Anchor.BottomLeft,
                            Origin = Anchor.BottomLeft,
                            Font = OsuFont.Numeric.With(size: 16, fixedWidth: true)
                        },
                        new OsuSpriteText
                        {
                            Anchor = Anchor.BottomLeft,
                            Origin = Anchor.BottomLeft,
                            Font = OsuFont.Numeric.With(size: 8),
                            Text = @"BPM",
                            Padding = new MarginPadding { Bottom = 2f }, // align baseline better
                        }
                    }
                };
            }
        }

        public bool UsesFixedAnchor { get; set; }
    }
}