Roll Observatory packages and add a roll script

charted/lib/core/utils/math.dart

-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-part of charted.core.utils;
-
-/// Mathematical constant PI
-const double PI = math.PI;
-
-/// PI * 0.5
-const double HALF_PI = PI / 2.0;
-
-/// PI * 2
-/// Ratio constant of a circle's circumference to radius
-const double TAU = PI * 2.0;
-
-/// An arbitrary small possible number
-const double EPSILON = 1e-6;
-
-/// EPSILON * EPSILON, where EPSILON is a arbitrarily small positive number
-const double EPSILON_SQUARE = EPSILON * EPSILON;
-
-/// Maximum value of Dart SMI.
-/// On 32 bit machines, numbers above this have an additional lookup overhead.
-const int SMALL_INT_MAX = (1 << 30) - 1;
-
-/// Minimum value of Dart SMI.
-/// On 32 bit machines, numbers below this have an additional lookup overhead.
-const int SMALL_INT_MIN = -1 * (1 << 30);
-
-/// Hyperbolic cosine.
-num cosh(num x) => ((x = math.exp(x)) + 1 / x) / 2;
-
-/// Hyperbolic sine.
-num sinh(num x) => ((x = math.exp(x)) - 1 / x) / 2;
-
-/// Hyperbolic tangent.
-num tanh(num x) => ((x = math.exp(2 * x)) - 1) / (x + 1);
-
-/// Converts [degrees] to radians.
-num toRadians(num degrees) => degrees * math.PI / 180.0;
-
-/// Converts [radians] to degrees.
-num toDegrees(num radians) => radians * 180.0 / math.PI;