rot function

Offset rot(
  1. Offset v,
  2. double a
)

Implementation

@pragma('vm:prefer-inline')
Offset rot(Offset v, double a) {
  final c = math.cos(a);
  final s = math.sin(a);
  return Offset(v.dx * c - v.dy * s, v.dx * s + v.dy * c);
}