public static double CalcRating(BeatmapInfo map)
{
// Call PatternAnalyzer to find Jacks / Spams.
var analyzer = new PatternAnalyzer(map.Notes, map.LNs, map.Data.Keys, map.Data.SpecialStyle);
var jacks = analyzer.GetJackRatio();
var spams = analyzer.GetSpamRatio();
// Spam correction.
// Deduct 'Corrected Max Density' and 'Corrected Average Density' by exponential function.
var corMaxDen = map.CorMaxDen * (1 - (Math.Pow(78, spams) - 1) / 100);
var corAvgDen = map.CorAvgDen * (1 - (Math.Pow(78, spams) - 1) / 100);
// Start from 'Corrected Max Density'
var result = corMaxDen;
// Density correction.
// If 'Corrected Average Density' is really close with 'Corrected Max Density',
if (corMaxDen <= corAvgDen * 1.1)
{
// then it means it's quite hard compared with its max density.
// Get bonus score.
result += corAvgDen * 0.1;
}
// If 'Corrected Average Density' is too low than 'Corrected Max Density',
else if (corMaxDen >= 3 && corMaxDen >= corAvgDen * 1.5)
{
// then it means it's quite easy compared with its max density.
// Deduct rating score.
result -= corMaxDen * 0.1;
}
// General correction for density.
var correction = Math.Pow(6, Math.Log(corMaxDen, corAvgDen + corMaxDen)) - 1;
result *= 1 - correction / 10;
// Jack correction.
// Increase Rating by exponential function.
result *= 1 + (Math.Pow(101, jacks) - 1) / 100;
// Key correction.
// Standard: 6k.
// Other key modes' rating value is set to 6k like '(key + 1) / 7'.
// If it's special style, than key -= 1.
var specialStyle = map.Data.Keys == 8 && (double)(analyzer.Notes[0].Count + analyzer.LNs[0].Count) / analyzer.Count < 0.06;
result *= (double)((specialStyle ? map.Data.Keys - 1 : map.Data.Keys) + 1) / 7;
// Multiply it only for convenience.
result *= 1.6;
return(result);
}
private static void CalcCorrectedDensityList(ref List <Note> notes, ref List <LongNote> lns, int key, out List <double> density)
{
int Key;
var pat = new PatternAnalyzer(notes, lns, key, false);
var corNotes = new List <NoteCount>();
var corLNs = new List <LongNoteCount>();
var Notes = new List <Note>();
var LNs = new List <LongNote>();
density = new List <double>();
var specialStyle = key == 8 && (double)(pat.Notes[0].Count + pat.LNs[0].Count) / pat.Count < 0.06;
if (!specialStyle)
{
Notes = notes;
LNs = lns;
Key = key;
}
else
{
Notes.AddRange(notes.Where(cur => cur.Line != 0));
LNs.AddRange(lns.Where(cur => cur.Line != 0));
Key = key - 1;
}
var(startPeriod, endPeriod) = GetPeriods(ref notes, ref lns);
for (var i = startPeriod; i < endPeriod - 1000; i += 250)
{
corNotes.Clear();
corLNs.Clear();
// Get the notes in current period.
corNotes.AddRange(from cur in Notes where cur.Time >= i && cur.Time <= i + 1000 select new NoteCount(cur.Time, cur.Line, 0));
corLNs.AddRange(
from cur in LNs where (cur.Time >= i && cur.Time <= i + 1000) ||
(cur.Endtime >= i && cur.Endtime <= i + 1000) ||
(cur.Time <= i && cur.Endtime >= i + 1000)
select new LongNoteCount(cur.Time, cur.Endtime, cur.Line, 0));
// Count the LN-count for each notes.
foreach (var cur in corLNs)
{
foreach (var note in corNotes)
{
if (note.Time >= cur.Time && note.Time < cur.Endtime)
{
note.LNs++;
}
}
for (var j = corLNs.IndexOf(cur) + 1; j < corLNs.Count; j++)
{
if ((corLNs[j].Time >= cur.Time && corLNs[j].Time < cur.Endtime) ||
(corLNs[j].Endtime >= cur.Time && corLNs[j].Endtime <= cur.Endtime) ||
(corLNs[j].Time <= cur.Time && corLNs[j].Endtime >= cur.Endtime))
{
corLNs[j].LNs++;
}
}
}
// Correct the density.
var den = (corNotes.Sum(cur => (double)Key / (Key - cur.LNs))
+ corLNs.Sum(cur => (double)Key / (Key - cur.LNs) * 1.1)) / Key;
density.Add(den);
}
}