mirror of https://github.com/ppy/osu
113 lines
4.0 KiB
C#
113 lines
4.0 KiB
C#
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
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// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using osu.Game.Rulesets.Objects.Types;
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using System;
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namespace osu.Game.Rulesets.Mania.Objects
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{
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internal class ManiaHitObjectDifficulty
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{
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/// <summary>
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/// Factor by how much individual / overall strain decays per second.
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/// </summary>
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/// <remarks>
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/// These values are results of tweaking a lot and taking into account general feedback.
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/// </remarks>
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internal const double INDIVIDUAL_DECAY_BASE = 0.125;
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internal const double OVERALL_DECAY_BASE = 0.30;
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internal ManiaHitObject BaseHitObject;
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private readonly int beatmapColumnCount;
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private readonly double endTime;
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private readonly double[] heldUntil;
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/// <summary>
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/// Measures jacks or more generally: repeated presses of the same button
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/// </summary>
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private readonly double[] individualStrains;
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internal double IndividualStrain
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{
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get
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{
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return individualStrains[BaseHitObject.Column];
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}
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set
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{
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individualStrains[BaseHitObject.Column] = value;
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}
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}
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/// <summary>
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/// Measures note density in a way
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/// </summary>
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internal double OverallStrain = 1;
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public ManiaHitObjectDifficulty(ManiaHitObject baseHitObject, int columnCount)
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{
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BaseHitObject = baseHitObject;
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endTime = (baseHitObject as IHasEndTime)?.EndTime ?? baseHitObject.StartTime;
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beatmapColumnCount = columnCount;
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heldUntil = new double[beatmapColumnCount];
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individualStrains = new double[beatmapColumnCount];
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for (int i = 0; i < beatmapColumnCount; ++i)
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{
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individualStrains[i] = 0;
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heldUntil[i] = 0;
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}
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}
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internal void CalculateStrains(ManiaHitObjectDifficulty previousHitObject, double timeRate)
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{
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// TODO: Factor in holds
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double timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
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double individualDecay = Math.Pow(INDIVIDUAL_DECAY_BASE, timeElapsed / 1000);
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double overallDecay = Math.Pow(OVERALL_DECAY_BASE, timeElapsed / 1000);
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double holdFactor = 1.0; // Factor to all additional strains in case something else is held
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double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly
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// Fill up the heldUntil array
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for (int i = 0; i < beatmapColumnCount; ++i)
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{
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heldUntil[i] = previousHitObject.heldUntil[i];
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// If there is at least one other overlapping end or note, then we get an addition, buuuuuut...
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if (BaseHitObject.StartTime < heldUntil[i] && endTime > heldUntil[i])
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{
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holdAddition = 1.0;
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}
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// ... this addition only is valid if there is _no_ other note with the same ending. Releasing multiple notes at the same time is just as easy as releasing 1
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if (endTime == heldUntil[i])
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{
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holdAddition = 0;
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}
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// We give a slight bonus to everything if something is held meanwhile
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if (heldUntil[i] > endTime)
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{
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holdFactor = 1.25;
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}
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// Decay individual strains
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individualStrains[i] = previousHitObject.individualStrains[i] * individualDecay;
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}
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heldUntil[BaseHitObject.Column] = endTime;
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// Increase individual strain in own column
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IndividualStrain += 2.0 * holdFactor;
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OverallStrain = previousHitObject.OverallStrain * overallDecay + (1.0 + holdAddition) * holdFactor;
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}
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}
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}
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