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// 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.
/// Whether two doubles are within a given distance of each other.
/// The `epsilon` argument must be positive and not null.
/// The `a` and `b` arguments may be null. A null value is only considered
/// near-equal to another null value.
bool nearEqual(double a, double b, double epsilon) {
assert(epsilon != null);
assert(epsilon >= 0.0);
if (a == null || b == null)
return a == b;
return (a > (b - epsilon)) && (a < (b + epsilon)) || a == b;
/// Whether a double is within a given distance of zero.
/// The epsilon argument must be positive.
bool nearZero(double a, double epsilon) => nearEqual(a, 0.0, epsilon);