// Copyright 2015 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'package:flutter/animation.dart'; import 'package:flutter/painting.dart'; /// An interpolation between two fractional offsets. /// /// This class specializes the interpolation of Tween<FractionalOffset> to be /// appropriate for rectangles. /// /// See [Tween] for a discussion on how to use interpolation objects. class FractionalOffsetTween extends Tween<FractionalOffset> { /// Creates a fractional offset tween. /// /// The [begin] and [end] properties may be null; the null value /// is treated as meaning the top left corner. FractionalOffsetTween({ FractionalOffset begin, FractionalOffset end }) : super(begin: begin, end: end); /// Returns the value this variable has at the given animation clock value. @override FractionalOffset lerp(double t) => FractionalOffset.lerp(begin, end, t); }