osu-lazer/osu.Game/Beatmaps/ControlPoints/TimingControlPoint.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using OpenTK;
using osu.Game.Beatmaps.Timing;

namespace osu.Game.Beatmaps.ControlPoints
{
    public class TimingControlPoint : ControlPoint
    {
        /// <summary>
        /// The time signature at this control point.
        /// </summary>
        public TimeSignatures TimeSignature = TimeSignatures.SimpleQuadruple;

        /// <summary>
        /// The beat length at this control point.
        /// </summary>
        public double BeatLength
        {
            get => beatLength;
            set => beatLength = MathHelper.Clamp(value, 6, 60000);
        }

        private double beatLength = 1000;
    }
}