osu-lazer/osu.Game.Rulesets.Taiko/Scoring/TaikoScoreProcessor.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using osu.Game.Rulesets.Judgements;
using osu.Game.Rulesets.Scoring;
using osu.Game.Rulesets.Taiko.Objects;

namespace osu.Game.Rulesets.Taiko.Scoring
{
    public partial class TaikoScoreProcessor : ScoreProcessor
    {
        private const double combo_base = 4;

        protected override double ClassicScoreMultiplier => 22;

        public TaikoScoreProcessor(Ruleset ruleset)
            : base(ruleset)
        {
        }

        protected override double ComputeTotalScore()
        {
            return
                (int)Math.Round
                ((
                    250000 * ComboPortion / MaxComboPortion +
                    750000 * Math.Pow(Accuracy.Value, 3.6) * ((double)CurrentBasicJudgements / MaxBasicJudgements) +
                    BonusPortion
                ) * ScoreMultiplier);
        }

        protected override void AddScoreChange(JudgementResult result)
        {
            var change = computeScoreChange(result);
            BonusPortion += change.bonus;
            ComboPortion += change.combo;
        }

        protected override void RemoveScoreChange(JudgementResult result)
        {
            var change = computeScoreChange(result);
            BonusPortion -= change.bonus;
            ComboPortion -= change.combo;
        }

        private (double combo, double bonus) computeScoreChange(JudgementResult result)
        {
            double hitValue = Judgement.ToNumericResult(result.Type);

            if (result.HitObject is StrongNestedHitObject strong)
            {
                double strongBonus = strong.Parent is DrumRollTick ? 3 : 7;
                hitValue *= strongBonus;
            }

            if (result.Type.IsBonus())
                return (0, hitValue);

            return (hitValue * Math.Min(Math.Max(0.5, Math.Log(result.ComboAtJudgement, combo_base)), Math.Log(400, combo_base)), 0);
        }
    }
}