bichord.html

<h1> BiChord Demo </h1>
<p id='statusx'></p>
<button onclick='remap()'>Remap</button>

<style>
  body{
    font-family: sans-serif;
  }
</style>

<script>

init()


function init(){
  window.addEventListener('keydown', keydown)
  window.addEventListener('keyup', keyup)
  status('init')
}


// contained release (always a chord)
// rolled release (release delay must be less than threshhold)

let keymap = {}
let keyindex = 1
let pressed = {}

let lastDown = -1
let lastRelease = -1
let lastCode = -1
let lastOverlap = -1
let MaxDelay = 50 // 
let MinOverlap = 100 // always triggers key

function keydown(e){
  let now = Date.now()
  let code = e.keyCode
  pressed[code] = now
  if(keyindex < 11){
    keymap[code] = keyindex++
  }
  lastDown = now
}
function keyup(e){
  let now = Date.now()
  let code = e.keyCode
  pressed[code] = -1
  lastCode = code
  lastRelease = now
}
function id(x){
  return document.getElementById(x)
}
function status(text){
  let t = document.createTextNode(text)
  let div = id('statusx')
  div.innerHTML = ''
  div.appendChild(t)
}
</script>