43 lines
1.3 KiB
C#
43 lines
1.3 KiB
C#
using Cryville.Common.Math;
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using System;
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namespace Cryville.Crtr.Extensions {
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public abstract class TimingModel {
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public double Time { get; protected set; }
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public double BeatTime { get; protected set; }
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public BeatTime FractionalBeatTime { get; protected set; }
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public double BPM { get; set; }
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public TimingModel(double offset) {
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Time = offset;
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FractionalBeatTime = new BeatTime(0, 0, 1);
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}
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}
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public class FractionalBeatTimeTimingModel : TimingModel {
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public FractionalBeatTimeTimingModel(double offset = 0) : base(offset) { }
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public void ForwardTo(BeatTime t) {
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if (t == FractionalBeatTime) return;
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if (BPM == 0) throw new InvalidOperationException("BPM not determined");
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FractionalBeatTime = t;
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var nt = t.Decimal;
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Time += (nt - BeatTime) / BPM * 60;
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BeatTime = nt;
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}
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}
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public class BeatTimeTimingModel : TimingModel {
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public BeatTimeTimingModel(double offset = 0) : base(offset) { }
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public void ForwardTo(double t) {
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if (t == BeatTime) return;
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if (BPM == 0) throw new InvalidOperationException("BPM not determined");
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Time += (t - BeatTime) / BPM * 60;
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BeatTime = t;
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FractionalBeatTime = ToBeatTime(t);
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}
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static BeatTime ToBeatTime(double beat, double error = 1e-4) {
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int i, n, d;
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FractionUtils.ToFraction(beat, error, out n, out d);
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i = n / d; n %= d;
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return new BeatTime(i, n, d);
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}
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}
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}
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