private void calculateSpecificStrain(OsuHitObjectDifficulty previousHitObject, OsuDifficultyCalculator.DifficultyType type, double timeRate)
{
double addition = 0;
double timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
double decay = Math.Pow(DECAY_BASE[(int)type], timeElapsed / 1000);
if (BaseHitObject.Type == HitObjectType.Spinner)
{
// Do nothing for spinners
}
else if (BaseHitObject.Type == HitObjectType.Slider)
{
switch (type)
{
case OsuDifficultyCalculator.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.lazySliderLength +
DistanceTo(previousHitObject), type) *
spacing_weight_scaling[(int)type];
break;
case OsuDifficultyCalculator.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.lazySliderLength, type) +
spacingWeight(DistanceTo(previousHitObject), type)
) *
spacing_weight_scaling[(int)type];
break;
}
}
else if (BaseHitObject.Type == HitObjectType.Circle)
{
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;
}
internal double DistanceTo(OsuHitObjectDifficulty other)
{
// Scale the distance by circle size.
return((startPosition - other.endPosition).Length * scalingFactor);
}
internal void CalculateStrains(OsuHitObjectDifficulty previousHitObject, double timeRate)
{
calculateSpecificStrain(previousHitObject, OsuDifficultyCalculator.DifficultyType.Speed, timeRate);
calculateSpecificStrain(previousHitObject, OsuDifficultyCalculator.DifficultyType.Aim, timeRate);
}
