dart:math library, its classes, constants and functions :
dart:math library is an inbuilt library in dart. It contains different mathematical constants, mathematical functions and a few classes. You can simply use this library by importing it in your code like below :
import 'dart:math';
In this post, I will show you these constants, functions and classes with a small description.
Constants of dart:math :
Following constants are defined in dart:math :
1. e(double) :
It is the base of natural logarithms. This is a double value. It is defined as :
const double e = 2.718281828459045
2. ln2(double) :
This is the closest representable value of natural logarithm of 2. This is a double value and it is implemented as like below :
const double ln2 = 0.6931471805599453
3. ln10(double) :
This is the closest representable value of natural logarithm of 10. It is also a double value.
const double ln10 = 2.302585092994046
log2e(double) :
Base 2 logarithm of e.
const double log2e = 1.4426950408889634
log10e(double) :
Base 10 logarithm of e.
const double log10e = 0.4342944819032518
pi(double) :
Constant π .
const double pi = 3.1415926535897932
sqrt1_2(double) :
Square root of half, 1/2 :
const double sqrt1_2 = 0.7071067811865476
sqrt2(double) :
Square root of 2.
const double sqrt2 = 1.4142135623730951
Functions :
Following functions are defined in dart:math :
Trigonometric functions :
1. sin(num radians) → double :
Get the sine of the parameter radians. Result is NaN if radians is not finite.
2. cos(num radians) → double :
Get the cosine of the parameter radians. Result is NaN if radians is not finite.
3. tan(num radians) → double :
Get the tangent of the parameter radians. It is equal to sine(radians)/cos(radians). If radians is not finite, it will give NaN. If the value of cos is zero, it will give infinite result.
4. asin(num x) → double :
Returns the arc sine of x in radians. If the value of x is not in between -1 to +1, it will return NaN.
5. acos(num x) → double :
Get the arc cosine of x in radians.If the value of x is not in between -1 to +1, it will return NaN.
6. atan(num x) → double :
Get the arc tangent of x in radians.It returns NaN, if the value of x is NaN.
7. atan2(num a num b) → double :
It returns the angle in radians between the positive x axis and the vector (b,a). It returns the result in range -PI..PI. If any argument is NaN, it returns NaN.
Other functions :
1. sqrt(num x) → double :
Returns the positive square root of x. If the value of x is -0.0, it returns -0.0. For other negative values of x or NaN, it returns NaN.
2. pow(num x num exponent) → num :
Returns x to the power of exponent.
3. max(T a T b) → T :
Returns the larger between a and b. If any one of these is NaN, it returns NaN.
4. min(T a T b) → T :
Returns the lesser between a and b. If any one of these is NaN, it returns NaN.
5. exp(num x) → double :
Returns e to the power of x. If x is NaN, it returns NaN.
6. log(num x) → double :
Returns the natural logarithm of x. If x is NaN or less than 0, it returns NaN. If x is equal to 0, it returns negative infinity.
Classes :
Following classes are defined in dart:math library :
1. MutableRectangle :
This class is for two dimensional axis aligned rectangles with mutable properties.
2. Rectangle :
This class is to generate two dimensional rectangles with immutable properties.
3. Random :
This class is to generate random values. It can be a random boolean, integer or double.
4. Point :
This class is to generate a point in a two dimensional plan.
