osu-lazer/osu.Game/Beatmaps/Objects/Mania/ManiaConverter.cs

//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System;
using System.Collections.Generic;
using osu.Game.Beatmaps.Objects.Osu;

namespace osu.Game.Beatmaps.Objects.Mania
{
    class ManiaConverter : HitObjectConverter<ManiaBaseHit>
    {
        private readonly int columns;

        public ManiaConverter(int columns)
        {
            this.columns = columns;
        }

        public override List<ManiaBaseHit> Convert(List<HitObject> input)
        {
            List<ManiaBaseHit> output = new List<ManiaBaseHit>();

            foreach (HitObject i in input)
            {
                ManiaBaseHit h = i as ManiaBaseHit;

                if (h == null)
                {
                    OsuBaseHit o = i as OsuBaseHit;

                    if (o == null) throw new HitObjectConvertException(@"Mania", i);

                    h = new Note
                    {
                        StartTime = o.StartTime,
                        Column = (int)Math.Round(o.Position.X / 512 * columns)
                    };
                }

                output.Add(h);
            }

            return output;
        }
    }
}