MapDecayTime()

float MapDecayTime

(

uint8_t

key_idx

)

Definition at line 33 of file util.cpp.

                                    {
  typedef InterpData<uint8_t, float> Datum;
  static const float bias = 1.3f;
  // key then time for decay in milliseconds.
  // First value is the KEY on the keyboard, second value is the
  // time. The KEY must be IN ORDER or else the algorithm will fail.
  static const Datum kInterpData[] = {
      Datum(0, 21.0f * 1000.0f * bias),
      Datum(11, 19.4 * 1000.0f * bias),
      Datum(22, 15.1f * 1000.0f * bias),
      Datum(35, 12.5f * 1000.0f * bias),
      Datum(44, 10.f * 1000.0f * bias),
      Datum(50, 8.1f * 1000.0f * bias),
      Datum(53, 5.3f * 1000.0f * bias),
      Datum(61, 4.0f * 1000.0f * bias),
      Datum(66, 5.0f * 1000.0f * bias),
      Datum(69, 4.6f * 1000.0f * bias),
      Datum(70, 4.4f * 1000.0f * bias),
      Datum(71, 4.3f * 1000.0f * bias),
      Datum(74, 3.9f * 1000.0f * bias),
      Datum(80, 1.9f * 1000.0f * bias),
      Datum(81, 1.8f * 1000.0f * bias),
      Datum(82, 1.7f * 1000.0f * bias),
      Datum(83, 1.5f * 1000.0f * bias),
      Datum(84, 1.3f * 1000.0f * bias),
      Datum(86, 1.0f * 1000.0f * bias),
      Datum(87, 0.9f * 1000.0f * bias),
  };
  
  static const int n = sizeof(kInterpData) / sizeof(kInterpData[0]);    
  float approx_val = Interp(key_idx, kInterpData, n);    
  return approx_val;
}

References Interp().

Referenced by CalcDecayFactor().

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