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Merge pull request #4279 from smoogipoo/new-diffcalc-catch

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Migrate catch to use the new difficulty calculator structure
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Dean Herbert 2019-02-20 10:30:24 +09:00 committed by GitHub
commit fd442372ce
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 210 additions and 287 deletions
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4
osu.Game.Rulesets.Catch.Tests/CatchDifficultyCalculatorTest.cs
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@ -13,11 +13,11 @@ namespace osu.Game.Rulesets.Catch.Tests
{
protected override string ResourceAssembly => "osu.Game.Rulesets.Catch";
[TestCase(3.8664391043534758, "diffcalc-test")]
[TestCase(3.8701854263563118d, "diffcalc-test")]
public void Test(double expected, string name)
=> base.Test(expected, name);
protected override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchLegacyDifficultyCalculator(new CatchRuleset(), beatmap);
protected override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(new CatchRuleset(), beatmap);
protected override Ruleset CreateRuleset() => new CatchRuleset();
}

2
osu.Game.Rulesets.Catch/CatchRuleset.cs
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@ -110,7 +110,7 @@ namespace osu.Game.Rulesets.Catch
public override Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.fa_osu_fruits_o };
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchLegacyDifficultyCalculator(this, beatmap);
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(this, beatmap);
public override int? LegacyID => 2;

6
osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyAttributes.cs
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@ -2,7 +2,6 @@
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Catch.Difficulty
{
@ -10,10 +9,5 @@ namespace osu.Game.Rulesets.Catch.Difficulty
{
public double ApproachRate;
public int MaxCombo;
public CatchDifficultyAttributes(Mod[] mods, double starRating)
: base(mods, starRating)
{
}
}
}

86
osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs Normal file
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@ -0,0 +1,86 @@
// 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 System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Catch.Difficulty.Preprocessing;
using osu.Game.Rulesets.Catch.Difficulty.Skills;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchDifficultyCalculator : DifficultyCalculator
{
private const double star_scaling_factor = 0.145;
protected override int SectionLength => 750;
private readonly float halfCatchWidth;
public CatchDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
: base(ruleset, beatmap)
{
var catcher = new CatcherArea.Catcher(beatmap.BeatmapInfo.BaseDifficulty);
halfCatchWidth = catcher.CatchWidth * 0.5f;
}
protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (beatmap.HitObjects.Count == 0)
return new CatchDifficultyAttributes { Mods = mods };
// this is the same as osu!, so there's potential to share the implementation... maybe
double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
return new CatchDifficultyAttributes
{
StarRating = Math.Sqrt(skills[0].DifficultyValue()) * star_scaling_factor,
Mods = mods,
ApproachRate = preempt > 1200.0 ? -(preempt - 1800.0) / 120.0 : -(preempt - 1200.0) / 150.0 + 5.0,
MaxCombo = beatmap.HitObjects.Count(h => h is Fruit) + beatmap.HitObjects.OfType<JuiceStream>().SelectMany(j => j.NestedHitObjects).Count(h => !(h is TinyDroplet))
};
}
protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
{
CatchHitObject lastObject = null;
foreach (var hitObject in beatmap.HitObjects.OfType<CatchHitObject>())
{
if (lastObject == null)
{
lastObject = hitObject;
continue;
}
switch (hitObject)
{
// We want to only consider fruits that contribute to the combo. Droplets are addressed as accuracy and spinners are not relevant for "skill" calculations.
case Fruit fruit:
yield return new CatchDifficultyHitObject(fruit, lastObject, clockRate, halfCatchWidth);
lastObject = hitObject;
break;
case JuiceStream _:
foreach (var nested in hitObject.NestedHitObjects.OfType<CatchHitObject>().Where(o => !(o is TinyDroplet)))
{
yield return new CatchDifficultyHitObject(nested, lastObject, clockRate, halfCatchWidth);
lastObject = nested;
}
break;
}
}
}
protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[]
{
new Movement(),
};
}
}

130
osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyHitObject.cs
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@ -1,130 +0,0 @@
// 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.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osuTK;
namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchDifficultyHitObject
{
internal static readonly double DECAY_BASE = 0.20;
private const float normalized_hitobject_radius = 41.0f;
private const float absolute_player_positioning_error = 16f;
private readonly float playerPositioningError;
internal CatchHitObject BaseHitObject;
/// <summary>
/// Measures jump difficulty. CtB doesn't have something like button pressing speed or accuracy
/// </summary>
internal double Strain = 1;
/// <summary>
/// This is required to keep track of lazy player movement (always moving only as far as necessary)
/// Without this quick repeat sliders / weirdly shaped streams might become ridiculously overrated
/// </summary>
internal float PlayerPositionOffset;
internal float LastMovement;
internal float NormalizedPosition;
internal float ActualNormalizedPosition => NormalizedPosition + PlayerPositionOffset;
internal CatchDifficultyHitObject(CatchHitObject baseHitObject, float catcherWidthHalf)
{
BaseHitObject = baseHitObject;
// We will scale everything by this factor, so we can assume a uniform CircleSize among beatmaps.
float scalingFactor = normalized_hitobject_radius / catcherWidthHalf;
playerPositioningError = absolute_player_positioning_error; // * scalingFactor;
NormalizedPosition = baseHitObject.X * CatchPlayfield.BASE_WIDTH * scalingFactor;
}
private const double direction_change_bonus = 12.5;
internal void CalculateStrains(CatchDifficultyHitObject previousHitObject, double timeRate)
{
// Rather simple, but more specialized things are inherently inaccurate due to the big difference playstyles and opinions make.
// See Taiko feedback thread.
double timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
double decay = Math.Pow(DECAY_BASE, timeElapsed / 1000);
// Update new position with lazy movement.
PlayerPositionOffset =
MathHelper.Clamp(
previousHitObject.ActualNormalizedPosition,
NormalizedPosition - (normalized_hitobject_radius - playerPositioningError),
NormalizedPosition + (normalized_hitobject_radius - playerPositioningError)) // Obtain new lazy position, but be stricter by allowing for an error of a certain degree of the player.
- NormalizedPosition; // Subtract HitObject position to obtain offset
LastMovement = DistanceTo(previousHitObject);
double addition = spacingWeight(LastMovement);
if (NormalizedPosition < previousHitObject.NormalizedPosition)
{
LastMovement = -LastMovement;
}
CatchHitObject previousHitCircle = previousHitObject.BaseHitObject;
double additionBonus = 0;
double sqrtTime = Math.Sqrt(Math.Max(timeElapsed, 25));
// Direction changes give an extra point!
if (Math.Abs(LastMovement) > 0.1)
{
if (Math.Abs(previousHitObject.LastMovement) > 0.1 && Math.Sign(LastMovement) != Math.Sign(previousHitObject.LastMovement))
{
double bonus = direction_change_bonus / sqrtTime;
// Weight bonus by how
double bonusFactor = Math.Min(playerPositioningError, Math.Abs(LastMovement)) / playerPositioningError;
// We want time to play a role twice here!
addition += bonus * bonusFactor;
// Bonus for tougher direction switches and "almost" hyperdashes at this point
if (previousHitCircle != null && previousHitCircle.DistanceToHyperDash <= 10.0f / CatchPlayfield.BASE_WIDTH)
{
additionBonus += 0.3 * bonusFactor;
}
}
// Base bonus for every movement, giving some weight to streams.
addition += 7.5 * Math.Min(Math.Abs(LastMovement), normalized_hitobject_radius * 2) / (normalized_hitobject_radius * 6) / sqrtTime;
}
// Bonus for "almost" hyperdashes at corner points
if (previousHitCircle != null && previousHitCircle.DistanceToHyperDash <= 10.0f / CatchPlayfield.BASE_WIDTH)
{
if (!previousHitCircle.HyperDash)
{
additionBonus += 1.0;
}
else
{
// After a hyperdash we ARE in the correct position. Always!
PlayerPositionOffset = 0;
}
addition *= 1.0 + additionBonus * ((10 - previousHitCircle.DistanceToHyperDash * CatchPlayfield.BASE_WIDTH) / 10);
}
addition *= 850.0 / Math.Max(timeElapsed, 25);
Strain = previousHitObject.Strain * decay + addition;
}
private static double spacingWeight(float distance)
{
return Math.Pow(distance, 1.3) / 500;
}
internal float DistanceTo(CatchDifficultyHitObject other)
{
return Math.Abs(ActualNormalizedPosition - other.ActualNormalizedPosition);
}
}
}

148
osu.Game.Rulesets.Catch/Difficulty/CatchLegacyDifficultyCalculator.cs
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@ -1,148 +0,0 @@
// 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 System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchLegacyDifficultyCalculator : LegacyDifficultyCalculator
{
/// <summary>
/// In milliseconds. For difficulty calculation we will only look at the highest strain value in each time interval of size STRAIN_STEP.
/// This is to eliminate higher influence of stream over aim by simply having more HitObjects with high strain.
/// The higher this value, the less strains there will be, indirectly giving long beatmaps an advantage.
/// </summary>
private const double strain_step = 750;
/// <summary>
/// The weighting of each strain value decays to this number * it's previous value
/// </summary>
private const double decay_weight = 0.94;
private const double star_scaling_factor = 0.145;
public CatchLegacyDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
: base(ruleset, beatmap)
{
}
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double clockRate)
{
if (!beatmap.HitObjects.Any())
return new CatchDifficultyAttributes(mods, 0);
var catcher = new CatcherArea.Catcher(beatmap.BeatmapInfo.BaseDifficulty);
float halfCatchWidth = catcher.CatchWidth * 0.5f;
var difficultyHitObjects = new List<CatchDifficultyHitObject>();
foreach (var hitObject in beatmap.HitObjects)
{
switch (hitObject)
{
// We want to only consider fruits that contribute to the combo. Droplets are addressed as accuracy and spinners are not relevant for "skill" calculations.
case Fruit fruit:
difficultyHitObjects.Add(new CatchDifficultyHitObject(fruit, halfCatchWidth));
break;
case JuiceStream _:
difficultyHitObjects.AddRange(hitObject.NestedHitObjects.OfType<CatchHitObject>().Where(o => !(o is TinyDroplet)).Select(o => new CatchDifficultyHitObject(o, halfCatchWidth)));
break;
}
}
difficultyHitObjects.Sort((a, b) => a.BaseHitObject.StartTime.CompareTo(b.BaseHitObject.StartTime));
if (!calculateStrainValues(difficultyHitObjects, clockRate))
return new CatchDifficultyAttributes(mods, 0);
// this is the same as osu!, so there's potential to share the implementation... maybe
double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
double starRating = Math.Sqrt(calculateDifficulty(difficultyHitObjects, clockRate)) * star_scaling_factor;
return new CatchDifficultyAttributes(mods, starRating)
{
ApproachRate = preempt > 1200.0 ? -(preempt - 1800.0) / 120.0 : -(preempt - 1200.0) / 150.0 + 5.0,
MaxCombo = difficultyHitObjects.Count
};
}
private bool calculateStrainValues(List<CatchDifficultyHitObject> objects, double timeRate)
{
CatchDifficultyHitObject lastObject = null;
if (!objects.Any()) return false;
// Traverse hitObjects in pairs to calculate the strain value of NextHitObject from the strain value of CurrentHitObject and environment.
foreach (var currentObject in objects)
{
if (lastObject != null)
currentObject.CalculateStrains(lastObject, timeRate);
lastObject = currentObject;
}
return true;
}
private double calculateDifficulty(List<CatchDifficultyHitObject> objects, double timeRate)
{
// The strain step needs to be adjusted for the algorithm to be considered equal with speed changing mods
double actualStrainStep = strain_step * timeRate;
// Find the highest strain value within each strain step
var highestStrains = new List<double>();
double intervalEndTime = actualStrainStep;
double maximumStrain = 0; // We need to keep track of the maximum strain in the current interval
CatchDifficultyHitObject previousHitObject = null;
foreach (CatchDifficultyHitObject hitObject in objects)
{
// While we are beyond the current interval push the currently available maximum to our strain list
while (hitObject.BaseHitObject.StartTime > intervalEndTime)
{
highestStrains.Add(maximumStrain);
// The maximum strain of the next interval is not zero by default! We need to take the last hitObject we encountered, take its strain and apply the decay
// until the beginning of the next interval.
if (previousHitObject == null)
{
maximumStrain = 0;
}
else
{
double decay = Math.Pow(CatchDifficultyHitObject.DECAY_BASE, (intervalEndTime - previousHitObject.BaseHitObject.StartTime) / 1000);
maximumStrain = previousHitObject.Strain * decay;
}
// Go to the next time interval
intervalEndTime += actualStrainStep;
}
// Obtain maximum strain
maximumStrain = Math.Max(hitObject.Strain, maximumStrain);
previousHitObject = hitObject;
}
// Build the weighted sum over the highest strains for each interval
double difficulty = 0;
double weight = 1;
highestStrains.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
foreach (double strain in highestStrains)
{
difficulty += weight * strain;
weight *= decay_weight;
}
return difficulty;
}
}
}

39
osu.Game.Rulesets.Catch/Difficulty/Preprocessing/CatchDifficultyHitObject.cs Normal file
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@ -0,0 +1,39 @@
// 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.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Objects;
namespace osu.Game.Rulesets.Catch.Difficulty.Preprocessing
{
public class CatchDifficultyHitObject : DifficultyHitObject
{
private const float normalized_hitobject_radius = 41.0f;
public new CatchHitObject BaseObject => (CatchHitObject)base.BaseObject;
public new CatchHitObject LastObject => (CatchHitObject)base.LastObject;
public readonly float NormalizedPosition;
/// <summary>
/// Milliseconds elapsed since the start time of the previous <see cref="CatchDifficultyHitObject"/>, with a minimum of 25ms.
/// </summary>
public readonly double StrainTime;
public CatchDifficultyHitObject(HitObject hitObject, HitObject lastObject, double clockRate, float halfCatcherWidth)
: base(hitObject, lastObject, clockRate)
{
// We will scale everything by this factor, so we can assume a uniform CircleSize among beatmaps.
var scalingFactor = normalized_hitobject_radius / halfCatcherWidth;
NormalizedPosition = BaseObject.X * CatchPlayfield.BASE_WIDTH * scalingFactor;
// Every strain interval is hard capped at the equivalent of 600 BPM streaming speed as a safety measure
StrainTime = Math.Max(25, DeltaTime);
}
}
}

82
osu.Game.Rulesets.Catch/Difficulty/Skills/Movement.cs Normal file
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@ -0,0 +1,82 @@
// 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.Catch.Difficulty.Preprocessing;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osuTK;
namespace osu.Game.Rulesets.Catch.Difficulty.Skills
{
public class Movement : Skill
{
private const float absolute_player_positioning_error = 16f;
private const float normalized_hitobject_radius = 41.0f;
private const double direction_change_bonus = 12.5;
protected override double SkillMultiplier => 850;
protected override double StrainDecayBase => 0.2;
protected override double DecayWeight => 0.94;
private float lastPlayerPosition;
private float lastDistanceMoved;
protected override double StrainValueOf(DifficultyHitObject current)
{
var catchCurrent = (CatchDifficultyHitObject)current;
float playerPosition = MathHelper.Clamp(
lastPlayerPosition,
catchCurrent.NormalizedPosition - (normalized_hitobject_radius - absolute_player_positioning_error),
catchCurrent.NormalizedPosition + (normalized_hitobject_radius - absolute_player_positioning_error)
);
float distanceMoved = playerPosition - lastPlayerPosition;
double distanceAddition = Math.Pow(Math.Abs(distanceMoved), 1.3) / 500;
double sqrtStrain = Math.Sqrt(catchCurrent.StrainTime);
double bonus = 0;
// Direction changes give an extra point!
if (Math.Abs(distanceMoved) > 0.1)
{
if (Math.Abs(lastDistanceMoved) > 0.1 && Math.Sign(distanceMoved) != Math.Sign(lastDistanceMoved))
{
double bonusFactor = Math.Min(absolute_player_positioning_error, Math.Abs(distanceMoved)) / absolute_player_positioning_error;
distanceAddition += direction_change_bonus / sqrtStrain * bonusFactor;
// Bonus for tougher direction switches and "almost" hyperdashes at this point
if (catchCurrent.LastObject.DistanceToHyperDash <= 10 / CatchPlayfield.BASE_WIDTH)
bonus = 0.3 * bonusFactor;
}
// Base bonus for every movement, giving some weight to streams.
distanceAddition += 7.5 * Math.Min(Math.Abs(distanceMoved), normalized_hitobject_radius * 2) / (normalized_hitobject_radius * 6) / sqrtStrain;
}
// Bonus for "almost" hyperdashes at corner points
if (catchCurrent.LastObject.DistanceToHyperDash <= 10.0f / CatchPlayfield.BASE_WIDTH)
{
if (!catchCurrent.LastObject.HyperDash)
bonus += 1.0;
else
{
// After a hyperdash we ARE in the correct position. Always!
playerPosition = catchCurrent.NormalizedPosition;
}
distanceAddition *= 1.0 + bonus * ((10 - catchCurrent.LastObject.DistanceToHyperDash * CatchPlayfield.BASE_WIDTH) / 10);
}
lastPlayerPosition = playerPosition;
lastDistanceMoved = distanceMoved;
return distanceAddition / catchCurrent.StrainTime;
}
}
}