/// <summary>
/// Correction #8 - Stacked notes nerf
/// We apply a nerf to the difficulty depending on how much objects overlap.
/// </summary>
private static double calculateStackedNoteNerf(OsuObjectPair lastToCurrent)
{
return(Math.Max(0,
Math.Min(lastToCurrent.RelativeLength,
Math.Min(1.2 * lastToCurrent.RelativeLength - 0.185, 1.4 * lastToCurrent.RelativeLength - 0.32)
)
));
}
private static double cosineOfAngleBetweenPairs(OsuObjectPair first, OsuObjectPair second)
{
// it is assumed that first points from object A to B, and second points from B to C
// therefore to adhere to the dot product formula for cosine, the first vector has to be reversed
double cosine = -first.RelativeVector.DotProduct(second.RelativeVector) / first.RelativeLength / second.RelativeLength;
// clamp mostly for sanity.
return(Math.Clamp(cosine, -1, 1));
}
/// <summary>
/// Correction #4 - Tap Strain
/// This buffs current object's aim difficulty rating by tap difficulty when distance is bigger than 0.
/// </summary>
private static double calculateTapStrainBuff(double tapStrain, OsuObjectPair lastToCurrent, double movementThroughput)
{
if (!(lastToCurrent.RelativeLength > 0))
{
return(1.0);
}
var tapBonus = SpecialFunctions.Logistic((tapStrain / movementThroughput - 1.34) / 0.1);
return(1.0 + tapBonus * 0.15);
}
public MovementExtractionParameters(
[CanBeNull] OsuHitObject fourthLastObject,
[CanBeNull] OsuHitObject secondLastObject,
OsuHitObject lastObject,
OsuHitObject currentObject,
[CanBeNull] OsuHitObject nextObject,
double gameplayRate)
{
FourthLastObject = fourthLastObject;
SecondLastObject = secondLastObject is Spinner ? null : secondLastObject;
LastObject = lastObject;
CurrentObject = currentObject;
NextObject = nextObject is Spinner ? null : nextObject;
FourthLastToCurrent = OsuObjectPair.Nullable(FourthLastObject, CurrentObject, gameplayRate);
SecondLastToLast = OsuObjectPair.Nullable(SecondLastObject, LastObject, gameplayRate);
SecondLastToCurrent = OsuObjectPair.Nullable(SecondLastObject, CurrentObject, gameplayRate);
SecondLastToNext = OsuObjectPair.Nullable(SecondLastObject, NextObject, gameplayRate);
LastToCurrent = new OsuObjectPair(LastObject, CurrentObject, gameplayRate);
LastToNext = OsuObjectPair.Nullable(LastObject, NextObject, gameplayRate);
CurrentToNext = OsuObjectPair.Nullable(CurrentObject, NextObject, gameplayRate);
EffectiveBPM = 30 / (LastToCurrent.TimeDelta + 1e-10);
LastObjectTemporallyCenteredBetweenNeighbours = false;
CurrentObjectTemporallyCenteredBetweenNeighbours = false;
SecondLastToCurrentFlowiness = 0;
LastToNextFlowiness = 0;
Cheesability = 0;
CheeseWindow = 0;
}