pseudo code of hp algorithm in Arcaea

arcaea-hp-algo.c

ScoreState::init() {
  if (skillType == 2) {
    this->hp = 100.0;
  } else if (this->characterAbility != NULL) {
    this->hp = this->characterAbility->hpStart;
  } else {
    this->hp = 0.0;
  }

  if (noteCount < 1) {
    calcHp = 0.0;
  } else {
    if (noteCount < 400) {
      baseHp = 200.0;
      additionHp = noteCount * 0.5;
    } else if (noteCount < 600) {
      baseHp = 280.0;
      additionHp = (noteCount - 400) * 0.5;
    } else {
      baseHp = 360.0;
      additionHp = (noteCount - 600) / 5.0;
    }
    calcHp = baseHp + additionHp;
  }
  adjustedHp = calcHp / 2.5;
  if (chartLevel == 11) // Lv10 chart
    adjustedHp *= 0.8;
  this->hpRegenCoeff = adjustedHp / noteCount;
}

enum HitAccuracyType {
  accPure;
  inaccPure;
  far;
};
enum LateEarlyType {
  late = 1;
  early;
}
ScoreState::hitNote(ScoreState *this, LogicNote *note, HitAccuracyType hitAccuracyType, LateEarlyType lateEarlyType, int unknown) {
  hpRegenCoeff = this->hpRegenCoeff;
  if (this->characterAbility != NULL) {
    // e.g Eto&Luna has 0.7, other has 1.0
    skillCoeff = this->characterAbility->getHpRegenCoeff();
    hpRegenCoeff *= skillCoeff;
  }
  if (hitAccuracyType == 2) { // far
    this->farCount++;
    updatedHp = hpRegenCoeff * 0.5 + this->hp;
    if (updatedHp > 100.0) updatedHp = 100.0;
    this->hp = updatedHp;
    if (lateEarlyType == 1) {
      this->lateFarCount++;
    } else if (lateEarlyType == 2) {
      this->earlyFarCount++;
    }
  } else { // pure
    this->pureCount++;
    updatedHp = hpRegenCoeff+ this->hp;
    if (updatedHp > 100.0) updatedHp = 100.0;
    if (hitAccuracyType == 1) {
      if (lateEarlyType == 1) {
        this->latePureCount++;
      } else if (lateEarlyType == 2) {
        this->earlyPureCount++;
      }
    }
  }

  // score calculation
}
ScoreState::missNote(ScoreState *this, LogicNote *note, int unknown) {
  damageBase = 0.6;
  if (skillType == 1) {
    damageBase = 1.0;
  }
  if (skillType == 2) { // hard
    damageBase = 2.5;
    if (this->hp > 30)
      damageBase = 4.5;
  } else if (skillType == 5) { // Fractire Hikari
    if (this->hadReachedFullHp) {
      damageBase = 0.6;
    } else {
      damageBase = 2.5;
      if (this->hp > 30)
        damageBase = 4.5;
    }
  }

  currentHp = this->hp;
  updatedHp = currentHp;
  if (note->noteType == "LogicLongNoteBase") { // unknown meaning
    updatedHp -= damageBase;
  } else {
    updatedHp -= damageBase * 2.0;
  }
  if (updatedHp < 0.0) updatedHp = 0.0;

  if (this->skillType == 2 && updatedHp < 30.0 && currentHp > 30.0) {
    // hard hp decrease from above 30 to below 30, decrease damage
    updatedHp += (currentHp - 30.0) * 0.5;
  }
  this->hp = updatedHp;
}