Game Math

A library of useful math classes & functions for game development, involving linear algebra, trigonometry, RNG, and more.

Installation

# choose based on your package manager
npm i @writegames.com/game-math
pnpm add @writegames.com/game-math
yarn add @writegames.com/game-math

What's Included

Linear Algebra

• Vec2, Vec3, Vec4, Mat2, Mat3, and Mat4 classes
• Dot products, cross products, vector-matrix multiplication, transformation matrices, and more

Random Number Generator

• Random class
  • Uses xorShift32 as default random function
  • float(n) - returns a random float between [0, n) (exclusive)
  • chance(n, max) - returns true or false based off of n in max chances (ex: chance(1, 5) would return true 20% of the time)
  • int(n) - returns a random int between [0, n) (exclusive) (ex: int(3) would return 0, 1, or 2)
  • range(a, b) - returns a random float between [a, b) (exclusive)
  • bool() - returns true or false
  • sign() - returns -1 or 1
  • angle() - returns a random angle in degrees [0, 360)
  • choose(items) - returns a random item from the array passed
  • shuffle(arr) - shuffles an array using the Fisher–Yates shuffle algorithm
  • vec2(scale) - returns a random Vec2 of the length of scale (defaults to 1)
  • vec3(scale) - returns a random Vec3 of the length of scale (defaults to 1)

Directions

• WIP

Trigonometry

• WIP

Notes

While this is pre-1.0, GameMaker compatibility may be incomplete and/or broken.

Credits

© 2025 WriteGames.com. MIT License