Envelopes.h

// ---- A simple linear falling envelope -------
class EnvelopeSimpleLinear {
  public:
    float counter = 1.0;
    float value;
    float speed = 0.001;
    float amount = 1.0;
    void update();
    void reset();
    void setAmount(float speed);
    void setSpeed(float speed);
};

void EnvelopeSimpleLinear::update() {
  this->counter -= this->speed;
  if (this->counter <= 0.0) {
    this->counter = 0.0;
  }
  this->value = this->counter * this->amount;
}

void EnvelopeSimpleLinear::reset() {
  this->counter = 1.0;
  this->value = 0.0;
}

void EnvelopeSimpleLinear::setSpeed(float speed) {
  this->speed = speed;
}

void EnvelopeSimpleLinear::setAmount(float amount) {
  this->amount = amount;
}

// ---- A simple logarithmic falling envelope -------
class EnvelopeSimpleLog {
  public:
    float counter = 1.0;
    float value;
    float speed = 0.001;
    float amount = 1.0;
    void update();
    void reset();
    void setAmount(float speed);
    void setSpeed(float speed);
};

void EnvelopeSimpleLog::update() {
  this->counter -= this->speed;
  if (this->counter <= 0.0) {
    this->counter = 0.0;
  }
  this->value = max(0.0, (log10(0.005 + 1.0 - this->counter)*-1.0))/2.3 * this->amount;
}

void EnvelopeSimpleLog::reset() {
  this->counter = 1.0;
  this->value = 0.0;
}

void EnvelopeSimpleLog::setSpeed(float speed) {
  this->speed = speed;
}

void EnvelopeSimpleLog::setAmount(float amount) {
  this->amount = amount;
}

// // ---- A simple logarithmic falling envelope -------
// class EnvelopeSigh {
//   public:
//     float counter = 0.0;
//     float value;
//     float speed = 0.001;
//     float delay = 300;
//     float amount = 1.0;
//     void update();
//     void reset();
//     void setAmount(float speed);
//     void setSpeed(float speed);
//     void setDelay(float speed);
// };

// void EnvelopeSimpleLog::update() {
//   this->counter -= this->speed;
//   if (this->counter <= 0.0) {
//     this->counter = 0.0;
//   }
//   this->value = max(0.0, (log10(0.005 + 1.0 - this->counter)*-1.0))/2.3 * this->amount;
// }

// void EnvelopeSimpleLog::reset() {
//   this->counter = 1.0;
//   this->value = 0.0;
// }

// void EnvelopeSimpleLog::setSpeed(float speed) {
//   this->speed = speed;
// }

// void EnvelopeSimpleLog::setAmount(float amount) {
//   this->amount = amount;
// }