transformInternal method

@override double transformInternal(double t)

Returns the value of the curve at point t.

The given parametric value t will be between 0.0 and 1.0, inclusive.

Implementation

@override
double transformInternal(double t) {
  if (_mZeta < 1) {
    // Under-damped
    t = math.exp(-t * _mZeta * _mW0) *
        (_mA * math.cos(_mWd * t) + _mB * math.sin(_mWd * t));
  } else {
    // Critically damped (ignoring over-damped case for now).
    t = (_mA + _mB * t) * math.exp(-t * _mW0);
  }

  // Map range from [1..0] to [0..1].
  return 1 - t;
}