way-of-life/src/js/patterns.js

Conway's game of life

'use strict'

function acorn (engine, i, j) {
  engine.set(i - 1, j)
  engine.set(i, j + 2)
  engine.set(i + 1, j - 1)
  engine.set(i + 1, j)
  engine.set(i + 1, j + 3)
  engine.set(i + 1, j + 4)
  engine.set(i + 1, j + 5)
}

function cross (engine, i, j) {
  engine.set(i - 1, j)
  engine.set(i, j - 1)
  engine.set(i, j)
  engine.set(i, j + 1)
  engine.set(i + 1, j)
}

function erase (engine, i, j) {
  engine.set(i - 1, j - 1, 0)
  engine.set(i - 1, j, 0)
  engine.set(i - 1, j + 1, 0)
  engine.set(i, j - 1, 0)
  engine.set(i, j, 0)
  engine.set(i, j + 1, 0)
  engine.set(i + 1, j - 1, 0)
  engine.set(i + 1, j, 0)
  engine.set(i + 1, j + 1, 0)
}

export {
  acorn, cross, erase
}