lerp method
lerp
return a value between begin
and end
Implementation
@override
BorderRadius lerp(double t) => BorderRadius.only(
topLeft: radiusNNLerp(begin.topLeft, end.topLeft, t),
topRight: radiusNNLerp(begin.topRight, end.topRight, t),
bottomLeft: radiusNNLerp(begin.bottomLeft, end.bottomLeft, t),
bottomRight: radiusNNLerp(begin.bottomRight, end.bottomRight, t),
);