quadraticBezier function
Implementation
Offset quadraticBezier(Offset p0, Offset p1, Offset p2, num t) => Offset(
pow(1 - t, 2) * ((1 - t) * p0.dx + t * p1.dx) +
t * ((1 - t) * p1.dx + t * p2.dx),
pow(1 - t, 2) * ((1 - t) * p0.dy + t * p1.dy) +
t * ((1 - t) * p1.dy + t * p2.dy));