samples-dev/swarm/swarm_ui_lib/touch/Math.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart = 2.9

part of touch;

// TODO(jacobr): pick a better name. This was goog.math in Closure.
/// Math utility functions originally from the closure Math library.
class GoogleMath {
  /// Takes a [value] and clamps it to within the bounds specified by
  /// [min] and [max].
  static num clamp(num value, num min, num max) {
    return Math.min(Math.max(value, min), max);
  }

  /// Tests whether the two values are equal to each other, within a certain
  /// tolerance to adjust for floating point errors.
  /// The optional [tolerance] value d Defaults to 0.000001. If specified,
  /// it should be greater than 0.
  /// Returns whether [a] and [b] are nearly equal.
  static bool nearlyEquals(num a, num b, [num tolerance = 0.000001]) {
    return (a - b).abs() <= tolerance;
  }
}