interpolate method

@override Animation interpolate(Animation current, double scroll)

Интерполяция между анимациями

Implementation

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

  return ScaleAnimation(
    start: start,
    end: end,
    scaleX: scaleX + (scale.scaleX - scaleX) * factor,
    scaleY: scaleY + (scale.scaleY - scaleY) * factor,
    pivotX: scale.pivotX,
    pivotY: scale.pivotY,
  );
}