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osu-lazer/osu.Game.Rulesets.Osu/Objects/Drawables/Pieces/SpinnerSpmCounter.cs
2020-01-09 13:43:44 +09:00

87 lines
2.7 KiB
C#

// 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 System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Utils;
using osu.Game.Graphics;
using osu.Game.Graphics.Sprites;
namespace osu.Game.Rulesets.Osu.Objects.Drawables.Pieces
{
public class SpinnerSpmCounter : Container
{
private readonly OsuSpriteText spmText;
public SpinnerSpmCounter()
{
Children = new Drawable[]
{
spmText = new OsuSpriteText
{
Anchor = Anchor.TopCentre,
Origin = Anchor.TopCentre,
Text = @"0",
Font = OsuFont.Numeric.With(size: 24)
},
new OsuSpriteText
{
Anchor = Anchor.TopCentre,
Origin = Anchor.TopCentre,
Text = @"SPINS PER MINUTE",
Font = OsuFont.Numeric.With(size: 12),
Y = 30
}
};
}
private double spm;
public double SpinsPerMinute
{
get => spm;
private set
{
if (value == spm) return;
spm = value;
spmText.Text = Math.Truncate(value).ToString(@"#0");
}
}
private struct RotationRecord
{
public float Rotation;
public double Time;
}
private readonly Queue<RotationRecord> records = new Queue<RotationRecord>();
private const double spm_count_duration = 595; // not using hundreds to avoid frame rounding issues
public void SetRotation(float currentRotation)
{
// Never calculate SPM by same time of record to avoid 0 / 0 = NaN or X / 0 = Infinity result.
if (Precision.AlmostEquals(0, Time.Elapsed))
return;
// If we've gone back in time, it's fine to work with a fresh set of records for now
if (records.Count > 0 && Time.Current < records.Last().Time)
records.Clear();
if (records.Count > 0)
{
var record = records.Peek();
while (records.Count > 0 && Time.Current - records.Peek().Time > spm_count_duration)
record = records.Dequeue();
SpinsPerMinute = (currentRotation - record.Rotation) / (Time.Current - record.Time) * 1000 * 60 / 360;
}
records.Enqueue(new RotationRecord { Rotation = currentRotation, Time = Time.Current });
}
}
}