mirror of https://github.com/ppy/osu
68 lines
2.1 KiB
C#
68 lines
2.1 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.Linq;
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using osu.Framework.Audio.Track;
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using osu.Game.Beatmaps;
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using osu.Game.Rulesets.UI;
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using osu.Game.Rulesets.Objects;
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namespace osu.Game.Rulesets.Mods
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{
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public abstract class ModTimeRamp : Mod, IUpdatableByPlayfield, IApplicableToTrack, IApplicableToBeatmap
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{
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/// <summary>
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/// The point in the beatmap at which the final ramping rate should be reached.
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/// </summary>
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private const double final_rate_progress = 0.75f;
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public override Type[] IncompatibleMods => new[] { typeof(ModTimeAdjust) };
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protected abstract double FinalRateAdjustment { get; }
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private double finalRateTime;
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private double beginRampTime;
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private Track track;
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public virtual void ApplyToTrack(Track track)
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{
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this.track = track;
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lastAdjust = 1;
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// for preview purposes. during gameplay, Update will overwrite this setting.
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applyAdjustment(1);
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}
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public virtual void ApplyToBeatmap(IBeatmap beatmap)
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{
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HitObject lastObject = beatmap.HitObjects.LastOrDefault();
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beginRampTime = beatmap.HitObjects.FirstOrDefault()?.StartTime ?? 0;
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finalRateTime = final_rate_progress * (lastObject?.GetEndTime() ?? 0);
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}
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public virtual void Update(Playfield playfield)
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{
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applyAdjustment((track.CurrentTime - beginRampTime) / finalRateTime);
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}
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private double lastAdjust = 1;
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/// <summary>
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/// Adjust the rate along the specified ramp
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/// </summary>
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/// <param name="amount">The amount of adjustment to apply (from 0..1).</param>
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private void applyAdjustment(double amount)
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{
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double adjust = 1 + (Math.Sign(FinalRateAdjustment) * Math.Clamp(amount, 0, 1) * Math.Abs(FinalRateAdjustment));
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track.Tempo.Value /= lastAdjust;
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track.Tempo.Value *= adjust;
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lastAdjust = adjust;
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}
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}
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}
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