interpolate method

@override Animation interpolate(Animation current, double scroll)

Интерполяция между анимациями

Implementation

@override
Animation interpolate(Animation current, double scroll) {
  final rotate = current as RotateAnimation;
  final factor = rotate.factor(scroll);

  return RotateAnimation(
    start: start,
    end: end,
    angle: angle + (rotate.angle - angle) * factor,
    pivotX: rotate.pivotX,
    pivotY: rotate.pivotY,
  );
}