path: root/client/index.js

import keys from './lib/keys'
import color from './lib/color'
import kalimba from './lib/kalimba'
import life from './lib/life'
import organ from './lib/organ'
import { browser, requestAudioContext, choice } from './lib/util'

let instrument = kalimba

const root = 440
const s = 50
const w = window.innerWidth
const h = window.innerHeight
const ws = Math.ceil(w/s), hs = Math.ceil(h/s)

const add_on = 0
const mul_on = 1.0
const add_off = 0.1
const mul_off = 0.9

let dragging = false
let erasing = false
let lastFreq = 0
let notes = []

requestAudioContext( () => {
  for (var i = 0; i < ws; i++) {
	  notes[i] = []
    for (var j = 0; j < hs; j++) {
      notes[i][j] = add(i, j)
    }
  }
  life.init(notes, assign)
})

function play(freq) {
  freq.playing = true
  instrument.play(freq.frequency)
  freq.div.classList.add('playing')
  life.assign_item(freq, true)
}
function pause(freq) {
  freq.playing = false
  instrument.pause(freq.frequency)
  freq.div.classList.remove('playing')
  life.assign_item(freq, false)
}
function assign(freq, state) {
  if (state) {
    play(freq)
  } else {
    pause(freq)
  }
}
function toggle(freq) {
  assign(freq, freq.playing = !freq.playing)
}
const gliderShape = [
  [0,0,0,0,0],
  [0,1,1,1,0],
  [0,0,0,1,0],
  [0,0,1,0,0],
  [0,0,0,0,0],
]
const gliderShapeFlip = gliderShape.map(a => a.slice(0).reverse())
const gliderShapes = [
  gliderShape,
  gliderShapeFlip,
  gliderShape.slice(0).reverse(),
  gliderShapeFlip.slice(0).reverse(),
]
function glider() {
  const x = Math.floor(Math.random() * ws)
  const y = Math.floor(Math.random() * hs)
  console.log("glider at", x, y)
  const shape = choice(gliderShapes)
  weave(x,y,shape)
}
function weave (x,y,shape) {
  const xmag = shape.length
  const ymag = shape[0].length
  let i, j, px, py
  for (i = 0; i < xmag; i++) {
    for (j = 0; j < ymag; j++) {
      px = (x+i) % ws
      py = (y+j) % hs
      assign(notes[px][py], shape[i][j])
    }
  }
}
function forEach(f){
  let i, j, note, s;
  for (i = 0; i < ws; i++) {
    for (j = 0; j < hs; j++) {
      note = notes[i][j]
      s = f(i,j,note.playing)
      assign(note, s)
    }
  }
}
function clear(){
  forEach((x,y,state) => {
    return false
  })
}
function white(){
  forEach((x,y,state) => {
    return false
  })
}
function stripex(odd){
  odd = !! odd
  forEach((x,y,state) => {
    return x % 2 ? odd : !odd
  })
}
function stripey(odd){
  odd = !! odd
  forEach((x,y,state) => {
    return y % 2 ? odd : !odd
  })
}
function checker(odd, n){
  odd = !! odd
  n = n || 1
  forEach((x,y,state) => {
    return ((Math.floor(x/n)%2) ^ (Math.floor(y/n)%2)) ? odd : !odd
  })
}
function noise(n){
  n = n || 0.5
  n = n * n
  forEach((x,y,state) => {
    return Math.random() < n
  })
}

function add (i, j) {
  const a = i + 1
  const b = j + 1
  const div = document.createElement('div')
  const frequency = root * a/b
  let add = 0
  let frac = Math.log2(a/b) % 1
  div.style.left = (i * s) + 'px'
  div.style.top = (j * s) + 'px'
  div.innerHTML = `<div>${a}<\/div><div>\/</div><div>${b}<\/div>`
  const freq = { frequency, div, i, j, playing: false }
  if (frac < 0) {
    frac += 1
  }
  if (a < b) {
    add = -Math.log(b/a) / 3.5
  }
  else {
    add = Math.log(a/b) / 6
  }
  if ( frac === 0) {
    div.style.fontWeight = '900'
    div.style.left = (i * s) + 'px'
    div.style.top = (j * s) + 'px'
  }
  div.style.backgroundColor = color(frac, add_off + add, mul_off)

  if (browser.isDesktop) {
    div.addEventListener('mousedown', function(){
      div.style.backgroundColor = color(frac, add + add_on, mul_on)
      toggle( freq )
      erasing = !freq.playing
    })
    div.addEventListener('mouseenter', function(){
      div.style.backgroundColor = color(frac, add + add_on, mul_on)
      if (dragging) {
        if (erasing) {
          pause( freq )
        } else {
          toggle( freq )
        }
      }
    })
    div.addEventListener('mouseleave', function(){
      div.style.backgroundColor = color(frac, add + add_off, mul_off)
    })
	}
	else {
    div.addEventListener('touchstart', function(e){
			e.preventDefault()
      toggle( freq )
      erasing = !freq.playing
			lastFreq = freq
    })
	}
  document.body.appendChild(div)
	return freq
}

if (browser.isDesktop) {
  document.addEventListener('mousedown', () => { dragging = true })
  document.addEventListener('mouseup', () => { dragging = false })
}
else {
  document.addEventListener('touchstart', (e) => { e.preventDefault(); dragging = true })
  document.addEventListener('touchmove', (e) => {
    e.preventDefault()
		const x = Math.floor( e.touches[0].pageX / s )
		const y = Math.floor( e.touches[0].pageY / s )
		if (! (x in notes) || ! (y in notes[x])) return
		const freq = notes[x][y]
		if (freq !== lastFreq) {
      if (dragging) {
        if (erasing) {
          pause( freq )
        } else {
          toggle( freq )
        }
      }
			lastFreq = freq
		}
  })
  document.addEventListener('touchend', () => { dragging = false })
}

function swap_instrument(){
  instrument = (instrument === kalimba) ? organ : kalimba
}

let life_bpm = 50
window.addEventListener("keydown", keydown, true)
function keydown(e){
  console.log(e.keyCode)
  if (e.altKey || e.ctrlKey || e.metaKey) return
  switch (e.keyCode){
    case 32: // space
      life.toggle()
      break
    case 38: // up
      life_bpm += e.shiftKey ? 1 : 5
      life.setTempo(life_bpm)
      break
    case 40: // down
      life_bpm -= e.shiftKey ? 1 : 5
      life_bpm = Math.max(1, life_bpm)
      life.setTempo(life_bpm)
      break
    case 71: // g
      glider()
      break
    case 83: // s
      swap_instrument()
      break
    case 67: // c
      clear()
      break
    case 87: // w
      white()
      break
    case 78: // n
      noise(0.5)
      break
    case 69: // e
      stripex(Math.random() < 0.5)
      break
    case 82: // r
      stripey(Math.random() < 0.5)
      break
    case 84: // t
      checker(Math.random() < 0.5, 1)
      break
    case 89: // y
      checker(Math.random() < 0.5, 2)
      break
    case 85: // u
      checker(Math.random() < 0.5, 3)
      break
    case 73: // i
      checker(Math.random() < 0.5, 4)
      break
    case 49: // 1
      noise(0.1)
      break
    case 50: // 2
      noise(0.2)
      break
    case 51: // 3
      noise(0.3)
      break
    case 52: // 4
      noise(0.4)
      break
    case 53: // 5
      noise(0.5)
      break
    case 54: // 6
      noise(0.6)
      break
    case 55: // 7
      noise(0.7)
      break
    case 56: // 8
      noise(0.8)
      break
    case 57: // 9
      noise(0.9)
      break
    case 48: // 0
      noise(1)
      break
  }
}
keys.listen(function(index){
  // const freq = scales.current().index(index)
  // document.body.style.backgroundColor = color( index / scales.current().scale.length )
  // instrument.toggle(freq)
})

let hash = window.location.hash || window.location.search
if (hash.match('sin') || hash.match('organ')) {
  instrument = organ
}
if (hash.match('glider')) {
  instrument = organ
  clear()
  glider()
  life.setTempo(life_bpm = 120 * 8)
  life.toggle()
}