lerp method

@override String lerp(double t)

Returns the value this variable has at the given animation clock value.

The default implementation of this method uses the +, -, and * operators on T. The begin and end properties must therefore be non-null by the time this method is called.

In general, however, it is possible for this to return null, especially when t=0.0 and begin is null, or t=1.0 and end is null.

Implementation

@override
String lerp(double t) {
  int index = (begin!.length + (end!.length - begin!.length) * t).round();
  return end!.length > begin!.length
      ? end!.substring(0, index)
      : begin!.substring(0, index);
}