Calculate player rating based on last sung line

Vocaluxe/Base/CGame.cs

@@ -199,6 +199,7 @@ namespace Vocaluxe.Base
                 Players[i].Points = 0f;
                 Players[i].PointsLineBonus = 0f;
                 Players[i].PointsGoldenNotes = 0f;
+                Players[i].Rating = 0.5f;
                 Players[i].VoiceNr = 0;
                 Players[i].NoteDiff = 0;
                 Players[i].SungLines = new List<CSungLine>();
@@ -343,10 +344,11 @@ namespace Vocaluxe.Base
                         }
                     }
 
-                    // Line Bonus
+                    // Check if line ended
                     int numLinesWithPoints = song.Notes.GetNumLinesWithPoints(Players[p].VoiceNr);
                     if (beat == lines[line].LastNoteBeat && lines[line].Points > 0 && numLinesWithPoints > 0)
                     {
+                        // Line Bonus
                         double factor = Players[p].SungLines[line].Points / (double)lines[line].Points;
                         if (factor <= 0.4)
                             factor = 0.0;
@@ -363,6 +365,11 @@ namespace Vocaluxe.Base
                         Players[p].Points += points;
                         Players[p].PointsLineBonus += points;
                         Players[p].SungLines[line].BonusPoints += points;
+
+                        //Calculate rating
+                        double stretchFactor = 0.2;
+                        double current = Players[p].SungLines[line].Points / (double)lines[line].Points;
+                        Players[p].Rating = (Players[p].Rating + (current * stretchFactor - 0.1)).Clamp(0, 1);
                     }
                 }
             }

VocaluxeLib/Structs.cs

@@ -362,6 +362,7 @@ namespace VocaluxeLib
         public double Points;
         public double PointsLineBonus;
         public double PointsGoldenNotes;
+        public double Rating;
         public int NoteDiff;
         public int VoiceNr;
         public List<CSungLine> SungLines;