TreeNode(TreeNode parent_, int choiceIndex_)
{
parent = parent_;
choiceIndex = choiceIndex_;
Choice choice = s_ChoiceSequence[Index][choiceIndex];
fingerChord = choice.chord;
staticCost = choice.staticCost;
wrists = choice.wrists;
note = s_NoteSeq[Index];
startTime = note.start;
timeUnit = choice.deltaTime / s_BenchmarkDuration;
leftFingers = generateFingerStates(parent.leftFingers, -1, fingerChord, note, Index);
rightFingers = generateFingerStates(parent.rightFingers, 1, fingerChord, note, Index);
}
Choice evaluateChordChoice(FingerChord chord, int index)
{
float deltaTime = index > 0 ? NoteSeq[index].start - NoteSeq[index - 1].start : 0;
NoteChord note = NoteSeq[index];
HandConfig.RangePair wrists = Config.getFingerChordWristRange(chord);
double cost = 0;
// wrist position naturality reward
if (wrists.left != null)
{
float distance = Math.Abs(wrists.left.middle - -HandConfig.WristNaturePosition);
cost = Math.Pow(distance / 14, 4) * CostCoeff.WRIST_POSITION_NATURALITY_REWARD;
}
if (wrists.right != null)
{
float distance = Math.Abs(wrists.right.middle - HandConfig.WristNaturePosition);
cost = Math.Pow(distance / 14, 4) * CostCoeff.WRIST_POSITION_NATURALITY_REWARD;
}
// wrist crowd punish
if (wrists.left != null && wrists.right != null)
{
float distance = Math.Max(Math.Abs(wrists.left.high - wrists.right.low), Math.Abs(wrists.right.high - wrists.left.low));
if (distance < 5)
{
cost += CostCoeff.WRIST_CROWD_PUNISH * (5f - distance) / 5f;
}
}
foreach (Finger f in chord.Values)
{
// shift fingers punish
if (Math.Abs((int)f) > 10)
{
cost += CostCoeff.SHIFT_FINGERS_PUNISH;
}
}
int leftFingerCount = 0;
int rightFingerCount = 0;
foreach (var pair in chord)
{
if (pair.Value != Finger.EMPTY)
{
// black key short punish
if (Piano.isBlackKey(pair.Key))
{
int finger = Math.Abs((int)pair.Value);
int first = (int)Math.Floor(finger / 10f) - 1;
int second = finger % 10 - 1;
float sh = HandConfig.BlackKeyShort[second];
if (first >= 0)
{
sh = Math.Max(HandConfig.BlackKeyShort[first], sh);
}
cost += sh * CostCoeff.BLACK_KEY_SHORT_PUNISH;
}
if (pair.Value > Finger.EMPTY)
{
++rightFingerCount;
}
else if (pair.Value < Finger.EMPTY)
{
++leftFingerCount;
}
}
else
{
// omit key punish
float importance = NotationUtils.getNoteImportanceInChord(note, pair.Key);
cost += CostCoeff.OMIT_KEY_PUNISH * importance;
}
}
// multiple fingers punish
if (leftFingerCount > 0)
{
float value = leftFingerCount / 5f;
cost += CostCoeff.MULTIPLE_FINGERS_PUNISH * value * value;
}
if (rightFingerCount > 0)
{
float value = rightFingerCount / 5f;
cost += CostCoeff.MULTIPLE_FINGERS_PUNISH * value * value;
}
return(new Choice {
chord = chord, staticCost = cost, wrists = wrists, deltaTime = deltaTime, node = new TreeNodeChoice()
});
}