transformInternal method

@override double transformInternal(double t)

Override this method to define the curve's behavior.

t is guaranteed to be in the range (0.0, 1.0) exclusive.

Implementation

@override
double transformInternal(double t) {
  final s = period / 4.0;
  t = 2.0 * t - 1.0;
  if (t < 0.0) {
    return -0.5 *
        math.pow(2.0, 10.0 * t).toDouble() *
        math.sin((t - s) * (math.pi * 2.0) / period);
  } else {
    return 0.5 *
            math.pow(2.0, -10.0 * t).toDouble() *
            math.sin((t - s) * (math.pi * 2.0) / period) +
        1.0;
  }
}