private void CalculateSpecificStrain(tpHitObject PreviousHitObject, DifficultyType Type)
{
double Addition = 0;
double TimeElapsed = BaseHitObject.StartTime - PreviousHitObject.BaseHitObject.StartTime;
double Decay = Math.Pow(DECAY_BASE[(int)Type], TimeElapsed / 1000);
if (BaseHitObject.GetType() == typeof(SpinnerObject))
{
// Do nothing for spinners
}
else if (BaseHitObject.GetType() == typeof(SliderObject))
{
switch(Type)
{
case DifficultyType.Speed:
// For speed strain we treat the whole slider as a single spacing entity, since "Speed" is about how hard it is to click buttons fast.
// The spacing weight exists to differentiate between being able to easily alternate or having to single.
Addition =
SpacingWeight(PreviousHitObject.LazySliderLengthFirst +
PreviousHitObject.LazySliderLengthSubsequent * (((SliderObject)BaseHitObject).RepeatCount - 1) +
DistanceTo(PreviousHitObject), Type) *
SPACING_WEIGHT_SCALING[(int)Type];
break;
case DifficultyType.Aim:
// For Aim strain we treat each slider segment and the jump after the end of the slider as separate jumps, since movement-wise there is no difference
// to multiple jumps.
Addition =
(
SpacingWeight(PreviousHitObject.LazySliderLengthFirst, Type) +
SpacingWeight(PreviousHitObject.LazySliderLengthSubsequent, Type) * (((SliderObject)BaseHitObject).RepeatCount - 1) +
SpacingWeight(DistanceTo(PreviousHitObject), Type)
) *
SPACING_WEIGHT_SCALING[(int)Type];
break;
}
}
else if (BaseHitObject.GetType() == typeof(CircleObject))
{
Addition = SpacingWeight(DistanceTo(PreviousHitObject), Type) * SPACING_WEIGHT_SCALING[(int)Type];
}
// Scale addition by the time, that elapsed. Filter out HitObjects that are too close to be played anyway to avoid crazy values by division through close to zero.
// You will never find maps that require this amongst ranked maps.
Addition /= Math.Max(TimeElapsed, 50);
Strains[(int)Type] = PreviousHitObject.Strains[(int)Type] * Decay + Addition;
}
public double DistanceTo(tpHitObject other)
{
// Scale the distance by circle size.
return (NormalizedStartPosition - (other.NormalizedEndPosition ?? other.NormalizedStartPosition)).Length;
}
public void CalculateStrains(tpHitObject PreviousHitObject)
{
CalculateSpecificStrain(PreviousHitObject, DifficultyType.Speed);
CalculateSpecificStrain(PreviousHitObject, DifficultyType.Aim);
}