// Copyright 2014 The Flutter 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/foundation.dart'; /// Structure that specifies maximum allowable magnitudes for distances, /// durations, and velocity differences to be considered equal. class Tolerance { /// Creates a [Tolerance] object. By default, the distance, time, and velocity /// tolerances are all ±0.001; the constructor arguments override this. /// /// The arguments should all be positive values. const Tolerance({ this.distance = _epsilonDefault, this.time = _epsilonDefault, this.velocity = _epsilonDefault, }); static const double _epsilonDefault = 1e-3; /// A default tolerance of 0.001 for all three values. static const Tolerance defaultTolerance = Tolerance(); /// The magnitude of the maximum distance between two points for them to be /// considered within tolerance. /// /// The units for the distance tolerance must be the same as the units used /// for the distances that are to be compared to this tolerance. final double distance; /// The magnitude of the maximum duration between two times for them to be /// considered within tolerance. /// /// The units for the time tolerance must be the same as the units used /// for the times that are to be compared to this tolerance. final double time; /// The magnitude of the maximum difference between two velocities for them to /// be considered within tolerance. /// /// The units for the velocity tolerance must be the same as the units used /// for the velocities that are to be compared to this tolerance. final double velocity; @override String toString() => '${objectRuntimeType(this, 'Tolerance')}(distance: ±$distance, time: ±$time, velocity: ±$velocity)'; }