1 files changed, 198 insertions, 0 deletions
diff --git a/client/lib/util.js b/client/lib/util.js
new file mode 100644
index 0000000..35a537d
--- /dev/null
+++ b/client/lib/util.js
@@ -0,0 +1,198 @@
+import Nexus from 'nexusui'
+// import Tone from 'tone'
+// import StartAudioContext from './startAudioContext'
+
+const isIphone = (navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))
+const isIpad = (navigator.userAgent.match(/iPad/i))
+const isAndroid = (navigator.userAgent.match(/Android/i))
+const isMobile = isIphone || isIpad || isAndroid
+const isDesktop = ! isMobile
+
+document.body.classList.add(isMobile ? 'mobile' : 'desktop')
+
+const browser = { isIphone, isIpad, isMobile, isDesktop }
+
+function choice (a){ return a[ Math.floor(Math.random() * a.length) ] }
+function randint (n) { return Math.floor(Math.random() * n) }
+function mod(n,m){ return n-(m * Math.floor(n/m)) }
+function norm(n, min, max){ return (n - min) / (max - min) }
+function shuffle(a){
+  a = a.slice(0)
+  for (var i = a.length; i > 0; i--){
+    var r = randint(i)
+    var swap = a[i-1]
+    a[i-1] = a[r]
+    a[r] = swap
+  }
+  return a
+}
+function shuffleInPlace(a){
+  for (var i = a.length; i > 0; i--){
+    var r = randint(i)
+    var swap = a[i-1]
+    a[i-1] = a[r]
+    a[r] = swap
+  }
+  return a
+}
+function requestAudioContext (fn) {
+	if (isMobile) {
+    const container = document.createElement('div')
+    const button = document.createElement('div')
+    button.innerHTML = 'Tap to start - please unmute your phone'
+    Object.assign(container.style, {
+      position: 'absolute',
+      width: '100%',
+      height: '100%',
+      zIndex: '10000',
+      top: '0px',
+      left: '0px',
+      backgroundColor: 'rgba(0, 0, 0, 0.8)',
+    })
+		Object.assign(button.style, {
+		  position: 'absolute',
+		  left: '50%',
+		  top: '50%',
+			padding: '20px',
+		  backgroundColor: '#7F33ED',
+		  color: 'white',
+		  fontFamily: 'monospace',
+		  borderRadius: '3px',
+		  transform: 'translate3D(-50%,-50%,0)',
+		  textAlign: 'center',
+			lineHeight: '1.5',
+    })
+    container.appendChild(button)
+    document.body.appendChild(container)
+    StartAudioContext.setContext(Tone.context)
+    StartAudioContext.on(button)
+    StartAudioContext.onStarted(_ => {
+      container.remove()
+			fn()
+  	})
+	} else {
+		fn()
+	}
+}
+
+function dataURItoBlob(dataURI) {
+  // convert base64 to raw binary data held in a string
+  // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
+  var byteString = atob(dataURI.split(',')[1]);
+
+  // separate out the mime component
+  var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
+
+  // write the bytes of the string to an ArrayBuffer
+  var ab = new ArrayBuffer(byteString.length);
+
+  // create a view into the buffer
+  var ia = new Uint8Array(ab);
+
+  // set the bytes of the buffer to the correct values
+  for (var i = 0; i < byteString.length; i++) {
+      ia[i] = byteString.charCodeAt(i);
+  }
+
+  // write the ArrayBuffer to a blob, and you're done
+  var blob = new Blob([ab], {type: mimeString});
+  return blob;
+
+}
+function ftom(f) {
+  // return (Math.log(f) - Math.log(261.626)) / Math.log(2) + 4.0
+  return 69 + 12 * Math.log2(f / 440)
+}
+function mtof(m) {
+  return 440 * Math.pow(2, (m - 69) / 12)
+}
+function tap (fn) {
+  return (e) => {
+    if (browser.isMobile) fn()
+    else if (e.press) fn()
+  }
+}
+
+function update_value_on_change(el, id, is_int, fn) {
+  const label = document.querySelector(id + ' + .val')
+  const update = v => {
+    label.innerHTML = is_int ? parseInt(v) : v.toFixed(2)
+    fn && fn(v)
+  }
+  el.on('change', update)
+  label.innerHTML = is_int ? parseInt(el.value) : el.value.toFixed(2)
+  el.update = update
+}
+function update_radio_value_on_change(el, id, values, fn) {
+  let old_v = el.active
+  const label = document.querySelector(id + ' + .val')
+  const update = v => {
+    if (v === -1) {
+      v = el.active = old_v
+    } else {
+      old_v = v
+    }
+    label.innerHTML = values[v][1]
+    fn && fn(v)
+  }
+  el.on('change', update)
+  update(el.active)
+  el.update = update
+}
+function build_options(el, lists, fn) {
+  Object.keys(lists).forEach(key => {
+    const list = lists[key]
+    const option = document.createElement('option')
+    option.innerHTML = list.name
+    option.value = key
+    el.appendChild(option)
+  })
+  el.addEventListener('input', function(e){
+    fn(e.target.value)
+  })
+}
+function Slider(parent, tag, title, options, is_int, fn){
+  const block = document.createElement('div')
+  block.classList.add('block')
+  const el = document.createElement('div')
+  el.setAttribute('id', tag)
+  const val = document.createElement('span')
+  val.classList.add('val')
+  const label = document.createElement('label')
+  label.innerHTML = title
+  block.appendChild(label)
+  block.appendChild(el)
+  block.appendChild(val)
+  parent.appendChild(block)
+  options.size = [200, 24]
+  const nx = new Nexus.Slider('#' + tag, options)
+  update_value_on_change(nx, '#' + tag, is_int, fn)
+  return nx
+}
+function Statistic(parent, label, fn){
+  const block = document.createElement('div')
+  block.classList.add('stat')
+  const key = document.createElement('div')
+  key.classList.add('key')
+  const val = document.createElement('div')
+  val.classList.add('val')
+  block.appendChild(key)
+  block.appendChild(val)
+  parent.appendChild(block)
+  key.innerHTML = label
+  val.innerHTML = fn()
+  let old_v
+  return () => {
+    const v = fn()
+    if (old_v === v) return
+    val.innerText = old_v = v
+  }
+}
+
+export {
+  mod, norm, choice, shuffle, randint,
+  browser, requestAudioContext, ftom, mtof, tap, dataURItoBlob,
+  update_value_on_change, update_radio_value_on_change, build_options,
+  Slider, Statistic,
+ }
+