osu/osu.Game.Rulesets.Catch/Difficulty/Skills/Movement.cs

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// 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.
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#nullable disable
using System;
using osu.Game.Rulesets.Catch.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Catch.Difficulty.Skills
{
public class Movement : StrainDecaySkill
{
private const float absolute_player_positioning_error = 16f;
private const float normalized_hitobject_radius = 41.0f;
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private const double direction_change_bonus = 21.0;
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protected override double SkillMultiplier => 900;
protected override double StrainDecayBase => 0.2;
protected override double DecayWeight => 0.94;
protected override int SectionLength => 750;
protected readonly float HalfCatcherWidth;
private float? lastPlayerPosition;
private float lastDistanceMoved;
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private double lastStrainTime;
/// <summary>
/// The speed multiplier applied to the player's catcher.
/// </summary>
private readonly double catcherSpeedMultiplier;
public Movement(Mod[] mods, float halfCatcherWidth, double clockRate)
: base(mods)
{
HalfCatcherWidth = halfCatcherWidth;
// In catch, clockrate adjustments do not only affect the timings of hitobjects,
// but also the speed of the player's catcher, which has an impact on difficulty
// TODO: Support variable clockrates caused by mods such as ModTimeRamp
// (perhaps by using IApplicableToRate within the CatchDifficultyHitObject constructor to set a catcher speed for each object before processing)
catcherSpeedMultiplier = clockRate;
}
protected override double StrainValueOf(DifficultyHitObject current)
{
var catchCurrent = (CatchDifficultyHitObject)current;
lastPlayerPosition ??= catchCurrent.LastNormalizedPosition;
float playerPosition = Math.Clamp(
lastPlayerPosition.Value,
catchCurrent.NormalizedPosition - (normalized_hitobject_radius - absolute_player_positioning_error),
catchCurrent.NormalizedPosition + (normalized_hitobject_radius - absolute_player_positioning_error)
);
float distanceMoved = playerPosition - lastPlayerPosition.Value;
double weightedStrainTime = catchCurrent.StrainTime + 13 + (3 / catcherSpeedMultiplier);
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double distanceAddition = (Math.Pow(Math.Abs(distanceMoved), 1.3) / 510);
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double sqrtStrain = Math.Sqrt(weightedStrainTime);
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double edgeDashBonus = 0;
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// Direction change bonus.
if (Math.Abs(distanceMoved) > 0.1)
{
if (Math.Abs(lastDistanceMoved) > 0.1 && Math.Sign(distanceMoved) != Math.Sign(lastDistanceMoved))
{
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double bonusFactor = Math.Min(50, Math.Abs(distanceMoved)) / 50;
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double antiflowFactor = Math.Max(Math.Min(70, Math.Abs(lastDistanceMoved)) / 70, 0.38);
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distanceAddition += direction_change_bonus / Math.Sqrt(lastStrainTime + 16) * bonusFactor * antiflowFactor * Math.Max(1 - Math.Pow(weightedStrainTime / 1000, 3), 0);
}
// Base bonus for every movement, giving some weight to streams.
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distanceAddition += 12.5 * Math.Min(Math.Abs(distanceMoved), normalized_hitobject_radius * 2) / (normalized_hitobject_radius * 6) / sqrtStrain;
}
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// Bonus for edge dashes.
if (catchCurrent.LastObject.DistanceToHyperDash <= 20.0f)
{
if (!catchCurrent.LastObject.HyperDash)
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edgeDashBonus += 5.7;
else
{
// After a hyperdash we ARE in the correct position. Always!
playerPosition = catchCurrent.NormalizedPosition;
}
distanceAddition *= 1.0 + edgeDashBonus * ((20 - catchCurrent.LastObject.DistanceToHyperDash) / 20) * Math.Pow((Math.Min(catchCurrent.StrainTime * catcherSpeedMultiplier, 265) / 265), 1.5); // Edge Dashes are easier at lower ms values
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}
lastPlayerPosition = playerPosition;
lastDistanceMoved = distanceMoved;
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lastStrainTime = catchCurrent.StrainTime;
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return distanceAddition / weightedStrainTime;
}
}
}