private double CalculateDifficulty(int nobjects)
{
double actualStrainStep = c_strainStep * ModsUtils.GetTimeRate(_mods);
List <double> highestStrains = new List <double>();
double intervalEndTime = actualStrainStep;
double maximumStrain = 0;
ManiaBeatmapObject prev = null;
for (int i = 0; i < nobjects; i++)
{
ManiaBeatmapObject note = Beatmap.Objects[i] as ManiaBeatmapObject;
Debug.Assert(note != null, nameof(note) + " != null");
while (note.StartTime > intervalEndTime)
{
highestStrains.Add(maximumStrain);
if (prev == null)
{
maximumStrain = 0;
}
else
{
double individualDecay = Math.Pow(ManiaBeatmapObject.INDIVIDUAL_DECAY_BASE, (intervalEndTime - prev.StartTime) / 1000.0);
double overallDecay = Math.Pow(ManiaBeatmapObject.OVERALL_DECAY_BASE, (intervalEndTime - prev.StartTime) / 1000.0);
maximumStrain = prev.IndividualStrain * individualDecay + prev.OverallStrain * overallDecay;
}
intervalEndTime += actualStrainStep;
}
double strain = note.IndividualStrain + note.OverallStrain;
if (strain > maximumStrain)
{
maximumStrain = strain;
}
prev = note;
}
double diff = 0;
double weigth = 1;
highestStrains.Sort((a, b) => b.CompareTo(a));
foreach (var strain in highestStrains)
{
diff += strain * weigth;
weigth *= c_decayWeight;
}
return(diff);
}
private void CalculateStrainValues(int nobjects)
{
var prevObject = Beatmap.Objects[0] as ManiaBeatmapObject;
for (int i = 1; i < nobjects; i++)
{
var curObject = Beatmap.Objects[i] as ManiaBeatmapObject;
Debug.Assert(curObject != null, nameof(curObject) + " != null");
curObject.ManiaCalculateStrains(prevObject, ModsUtils.GetTimeRate(_mods));
prevObject = curObject;
}
}