@okiba/math

Okiba / math

Collection of math functions

Installation

You can grab it as an npm package

npm i --save @okiba/math

Or use it in the browser

<!-- Minified -->
<script src="https://unpkg.com/@okiba/math@1.0.11/dist/index.min.js"></script>

<!-- Full -->
<script src="https://unpkg.com/@okiba/math@1.0.11/dist/index.js"></script>

lerp(min, max, fraction)

Linear interpolation between a two values

import {lerp} from '@okiba/math'
const xPosition = lerp(0, 100, 0.5)
console.log(xPosition) // 50

Arguments

+ min: Number

Minimum possible value

+ max: Number

Maximum possible value

+ fraction: Number

Current position

Returns

Number The interpolated value

map(n, min1, max1, min2, max2)

Maps a value between two ranges

import {map} from '@okiba/math'

const x = map(0.5, 0, 1, 0, 1000)
console.log(x) // 500

const y = map(0, -1, 1, -1000, 1000)
console.log(y) // 0

Arguments

+ n: Number

Value to map

+ min1: Number

Source range minimum

+ max1: Number

Source range maximum

+ min2: Number

Target range minimum

+ max2: Number

Target range maximum

Returns

Number Mapped value

cap(n, min, max)

Limit a value between a min and a max (inclusive)

import {cap} from '@okiba/math'
let progress = 1.1
progress = cap(0, 1, progress)
console.log(progress) // 1

Arguments

+ n: Number

Value to cap

+ min: Number

Minimum possible value

+ max: Number

Maximum possible value

Returns

Number Capped value

distance(x1, x2)

Distance between two numbers

import {distance} from '@okiba/math'
const x1 = -100, x2 = 100
const d = distance(x1, x2)
console.log(d) // 200

Arguments

+ x1: Number

First number

+ x2: Number

Second number

Returns

Number Distance between the values

round(n, p)

Round a number with given precision, with memoized powers

import {round} from '@okiba/math'
const rounded = distance(1.111111, 3)
console.log(rounded) // 1.111

Arguments

+ n: Number

Number to round

+ p: Number | optional - default: 3

Precision of digits to leave

Returns

Number Rounded number