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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 // A part of the dart:math library. |
| 6 |
| 7 /** |
| 8 * Base of the natural logarithms. |
| 9 */ |
| 10 final double E = 2.718281828459045; |
| 11 |
| 12 /** |
| 13 * Natural logarithm of 10. |
| 14 */ |
| 15 final double LN10 = 2.302585092994046; |
| 16 |
| 17 /** |
| 18 * Natural logarithm of 2. |
| 19 */ |
| 20 final double LN2 = 0.6931471805599453; |
| 21 |
| 22 /** |
| 23 * Base-2 logarithm of E. |
| 24 */ |
| 25 final double LOG2E = 1.4426950408889634; |
| 26 |
| 27 /** |
| 28 * Base-10 logarithm of E. |
| 29 */ |
| 30 final double LOG10E = 0.4342944819032518; |
| 31 |
| 32 /** |
| 33 * The PI constant. |
| 34 */ |
| 35 final double PI = 3.1415926535897932; |
| 36 |
| 37 /** |
| 38 * Square root of 1/2. |
| 39 */ |
| 40 final double SQRT1_2 = 0.7071067811865476; |
| 41 |
| 42 /** |
| 43 * Square root of 2. |
| 44 */ |
| 45 final double SQRT2 = 1.4142135623730951; |
| 46 |
| 47 /** |
| 48 * Parses a [String] representation of an [int], and returns |
| 49 * an [int]. Throws a [BadNumberFormatException] if [str] |
| 50 * cannot be parsed as an [int]. |
| 51 */ |
| 52 int parseInt(String str) => MathNatives.parseInt(str); |
| 53 |
| 54 /** |
| 55 * Parses a [String] representation of a [double], and returns |
| 56 * a [double]. Throws a [BadNumberFormatException] if [str] cannot |
| 57 * be parsed as a [double]. |
| 58 */ |
| 59 double parseDouble(String str) => MathNatives.parseDouble(str); |
| 60 |
| 61 num min(num a, num b) { |
| 62 int c = a.compareTo(b); |
| 63 if (c == 0) return a; |
| 64 if (c < 0) { |
| 65 if ((b is double) && b.isNaN()) return b; |
| 66 return a; |
| 67 } |
| 68 if ((a is double) && a.isNaN()) return a; |
| 69 return b; |
| 70 } |
| 71 |
| 72 num max(num a, num b) { |
| 73 // NaNs are handled correctly since the compareTo function always considers |
| 74 // them to be bigger than any other operand. |
| 75 return (a.compareTo(b) < 0) ? b : a; |
| 76 } |
| 77 |
| 78 /** |
| 79 * Returns the arc tangent of [a]/[b] with sign according to quadrant. |
| 80 */ |
| 81 double atan2(num a, num b) => MathNatives.atan2(a, b); |
| 82 |
| 83 /** |
| 84 * If the [exponent] is an integer the result is of the same type as [x]. |
| 85 * Otherwise it is a [double]. |
| 86 */ |
| 87 num pow(num x, num exponent) => MathNatives.pow(x, exponent); |
| 88 |
| 89 double sin(num x) => MathNatives.sin(x); |
| 90 double cos(num x) => MathNatives.cos(x); |
| 91 double tan(num x) => MathNatives.tan(x); |
| 92 double acos(num x) => MathNatives.acos(x); |
| 93 double asin(num x) => MathNatives.asin(x); |
| 94 double atan(num x) => MathNatives.atan(x); |
| 95 double sqrt(num x) => MathNatives.sqrt(x); |
| 96 double exp(num x) => MathNatives.exp(x); |
| 97 double log(num x) => MathNatives.log(x); |
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