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41 lines
1.5 KiB
C#
41 lines
1.5 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using osu.Game.Rulesets.Scoring;
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namespace osu.Game.Screens.Ranking.Statistics
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{
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/// <summary>
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/// Displays the unstable rate statistic for a given play.
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/// </summary>
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public class UnstableRate : SimpleStatisticItem<double>
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{
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/// <summary>
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/// Creates and computes an <see cref="UnstableRate"/> statistic.
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/// </summary>
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/// <param name="hitEvents">Sequence of <see cref="HitEvent"/>s to calculate the unstable rate based on.</param>
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public UnstableRate(IEnumerable<HitEvent> hitEvents)
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: base("Unstable Rate")
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{
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var timeOffsets = hitEvents.Where(e => !(e.HitObject.HitWindows is HitWindows.EmptyHitWindows) && e.Result.IsHit())
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.Select(ev => ev.TimeOffset).ToArray();
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Value = 10 * standardDeviation(timeOffsets);
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}
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private static double standardDeviation(double[] timeOffsets)
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{
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if (timeOffsets.Length == 0)
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return double.NaN;
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var mean = timeOffsets.Average();
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var squares = timeOffsets.Select(offset => Math.Pow(offset - mean, 2)).Sum();
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return Math.Sqrt(squares / timeOffsets.Length);
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}
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protected override string DisplayValue(double value) => double.IsNaN(value) ? "(not available)" : value.ToString("N2");
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}
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}
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