1 files changed, 333 insertions, 0 deletions
diff --git a/client/index.js b/client/index.js
new file mode 100644
index 0000000..e6f0716
--- /dev/null
+++ b/client/index.js
@@ -0,0 +1,333 @@
+import Tone from 'tone'
+import WebMidi from 'webmidi'
+import Nexus from 'nexusui'
+import keys from './lib/keys'
+import kalimba from './lib/kalimba'
+import scales from './lib/scales'
+import { requestAudioContext, ftom, dataURItoBlob } from './lib/util'
+import { saveAs } from 'file-saver/FileSaver'
+
+import * as data from './data'
+
+const MidiWriter = require('midi-writer-js')
+
+const DEFAULT_BPM = 60
+
+const nx = window.nx = {}
+
+let midi
+let exporting = false
+let recording = false
+let recorder = null
+
+const note_values = [
+  [8, '8 measures', 8 * 512],
+  [4, '4 measures', 4 * 512],
+  [2, '2 measures', 2 * 512],
+  [1, 'whole note', 512],
+  [1/2, 'half note', 256],
+  [1/3, 'third note', [170, 170, 171]],
+  [1/4, 'quarter note', 128],
+  [1/5, 'fifth note', [51,51,51,51,52]],
+  [1/6, 'sixth note', [85, 85, 86, 85, 85, 86]],
+  [1/8, 'eighth note', 64],
+  [1/10, 'tenth note', [25,26,26,25,26,25,26,26,25,26]],
+  [1/12, 'twelfth note', [21,21,22, 21,21,22, 21,21,22, 21,21,22]],
+  [1/16, 'sixteenth note', 32],
+  [1/32, 'thirtysecond note', 16],
+]
+
+WebMidi.enable(midi_ready)
+function midi_ready(err) {
+  if (err) {
+    console.error('webmidi failed to initialize')
+    return
+  }
+  if (!WebMidi.outputs.length) {
+    console.error('no MIDI output found')
+    return
+  }
+  console.log(WebMidi.inputs)
+  console.log(WebMidi.outputs)
+  if (WebMidi.outputs.length > 1) {
+    const filtered = WebMidi.outputs.filter(output => output.name.match(/prodipe/i))
+    if (filtered.length) {
+      // midi = filtered[0]
+    }
+  }
+  // midi = midi || WebMidi.outputs[0]
+  // console.log(midi.name)
+}
+
+let i = 0, datasets = {}, dataset = {}, bounds = {}, diff = []
+let play_fn = play_sequence
+data.load().then(lists => {
+  // nx.dataset.choices = Object.keys(lists)
+  console.log(lists) 
+  datasets = lists
+  pick_dataset('housing costs and income inequality')
+  requestAudioContext(ready)
+})
+
+function pick_dataset(key){
+  console.log('pick dataset:', key)
+  i = 0
+  dataset = datasets[key]
+  bounds = get_bounds(dataset)
+  diff = get_diff_bounds(bounds.rows)
+}
+var behaviors = {
+  sequence: { name: 'Sequence', fn: play_sequence },
+  interval: { name: 'Intervals', fn: play_interval_sequence },
+}
+function pick_behavior(name){
+  play_fn = behaviors[name].fn
+}
+function play_next(){
+  let note_time = 120000 / Tone.Transport.bpm.value * note_values[nx.timing.active][0] * nx.duration.value
+  setTimeout(play_next, note_time)
+  let [new_i, notes] = play_fn(i, note_time)
+  i = new_i
+  if (recording) {
+    let timing = note_values[nx.timing.active][2]
+    if (timing.length) timing = timing[i % timing.length]
+    recorder.addEvent(new MidiWriter.NoteEvent({ pitch: notes, duration: 't' + timing }))
+  }
+}
+function play_sequence(i, note_time) {
+  const { rows, min, max } = bounds
+  const count = rows.length * rows[0].length
+  if (i >= count) i = 0
+  const y = Math.floor(i / rows[0].length)
+  const x = i % rows[0].length
+  if (!x) console.log(y)
+  const n = rows[y][x]
+  i += 1
+  if (i >= count) i = 0
+  const midi_note = play( norm(n, min, max) * nx.multiply.value, note_time)
+  return [i, [midi_note]]
+}
+function play_interval_sequence(i, note_time) {
+  const { rows, min, max } = bounds
+  const count = rows.length
+  if (i >= count) i = 0
+  const y = i % count
+  const row = rows[y]
+  if (! row) { i = 0; return }
+  const row_min = Math.min.apply(Math, row)
+  // const row_max = Math.max.apply(Math, row)
+  const row_f0 = norm(row_min, min, max)
+  const row_root = row_f0 * nx.multiply.value
+  const notes = row.map(n => {
+    const note = row_root + norm(n - row_min, diff.min, diff.max) * nx.interval.value
+    play(note, note_time)
+  })
+  i += 1
+  return [i, notes]
+}
+
+function norm(n, min, max){
+  return (n - min) / (max - min)
+}
+function get_diff_bounds(rows){
+  const diffs = rows.map(row => {
+    const row_min = Math.min.apply(Math, row)
+    const row_max = Math.max.apply(Math, row)
+    return row_max - row_min
+  })
+  const min = Math.min.apply(Math, diffs)
+  const max = Math.max.apply(Math, diffs)
+  return { min, max }
+}
+function get_bounds(dataset){
+  let rows = dataset.lines
+  rows.forEach(row => row.shift())
+  rows = rows.map(a => a.map(n => parseFloat(n)))
+  const max = rows.reduce((a,b) => {
+    return b.reduce((z,bb) => {
+      return Math.max(z, bb)
+    }, a)
+  }, -Infinity)
+  const min = rows.reduce((a,b) => {
+    return b.reduce((z,bb) => {
+      return Math.min(z, bb)
+    }, a)
+  }, Infinity)
+  return { rows, max, min }
+}
+function play(index, duration){
+  // console.log(index)
+  const scale = scales.current()
+  const freq = scale.index(index + Math.round(nx.offset.value), nx.octave.value)
+  let midi_note = ftom(freq)
+  let cents = midi_note % 1
+  if (cents > 0.5) {
+    midi_note += 1
+    cents -= 1
+  }
+  cents *= 2
+  midi_note = Math.floor(midi_note)
+  if ((midi || exporting) && midi_note > 127) return 0
+  const note = Tone.Frequency(Math.floor(midi_note), "midi").toNote()
+  if (exporting || midi) {
+    duration = duration || 60000 / Tone.Transport.bpm.value
+    if (! exporting) {
+      midi.playNote(note, "all", { duration })
+      midi.sendPitchBend(cents, "all")
+    }
+  } else {
+    kalimba.play(freq)
+  }
+  return note
+}
+
+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)
+  update(el.value)
+  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 ready () {
+  scales.build_options(document.querySelector('#scale'))
+  build_options(document.querySelector('#dataset'), datasets, pick_dataset)
+  build_options(document.querySelector('#behavior'), behaviors, pick_behavior)
+  // nx.colorize('#f4d142')
+
+	Tone.Transport.bpm.value = DEFAULT_BPM
+  nx.tempo = new Nexus.Dial('#tempo', {
+    min: 10,
+    max: 300,
+    step: 1,
+    value: DEFAULT_BPM,
+  })
+  update_value_on_change(nx.tempo, '#tempo', true, v => Tone.Transport.bpm.value = v)
+
+  nx.timing = new Nexus.RadioButton('#timing', {
+    size: [400,25],
+    numberOfButtons: note_values.length,
+    active: 6,
+  })
+  update_radio_value_on_change(nx.timing, '#timing', note_values)
+
+  nx.duration = new Nexus.Dial('#duration', {
+    min: 0,
+    max: 2,
+    step: 0.01,
+    value: 0.8,
+  })
+  update_value_on_change(nx.duration, '#duration', false)
+
+  nx.offset = new Nexus.Dial('#offset', {
+    min: -24,
+    max: 24,
+    step: 1,
+    value: 0,
+  })
+  update_value_on_change(nx.offset, '#offset', true)
+
+  nx.octave = new Nexus.Dial('#octave', {
+    min: -4,
+    max: 4,
+    step: 1,
+    value: 0,
+  })
+  update_value_on_change(nx.octave, '#octave', true)
+
+  nx.multiply = new Nexus.Dial('#multiply', {
+    min: -64,
+    max: 64,
+    step: 1,
+    value: 7,
+  })
+  update_value_on_change(nx.multiply, '#multiply', true)
+
+  nx.interval = new Nexus.Dial('#interval', {
+    min: -64,
+    max: 64,
+    step: 1,
+    value: 10,
+  })
+  update_value_on_change(nx.interval, '#interval', true)
+
+  const export_midi_button = document.querySelector('#export_midi')
+  export_midi_button.addEventListener('click', export_pattern_as_midi)
+
+  const record_midi_button = document.querySelector('#record_midi')
+  record_midi_button.addEventListener('click', () => {
+    if (recording) {
+      record_midi_button.innerHTML = 'Record MIDI'
+      document.body.classList.remove('recording')
+      recording = false
+      const writer = new MidiWriter.Writer([recorder])
+      const blob = dataURItoBlob(writer.dataUri())
+      saveAs(blob, 'Recording - ' + dataset.name + '.mid')
+    } else {
+      record_midi_button.innerHTML = 'Save Recording'
+      document.body.classList.add('recording')
+      recording = true
+      recorder = new MidiWriter.Track()
+      recorder.setTempo(nx.tempo.value)
+    }
+  })
+
+  document.querySelector('.loading').classList.remove('loading')
+  play_next()
+}
+function export_pattern_as_midi(){
+  const behavior = document.querySelector('#behavior').value
+  const { rows } = bounds
+  let count = behavior === 'sequence' ? rows[0].length * rows.length : rows.length
+  let notes
+  let note_time
+  let timing = note_values[nx.timing.active][2]
+  exporting = true
+  let midi_track = new MidiWriter.Track()
+  midi_track.setTempo(nx.tempo.value)
+  for (let i = 0, len = count; i < len; i++) {
+    notes = play_fn(i)[1]
+    if (timing.length) note_time = timing[i % timing.length]
+    else note_time = timing
+    midi_track.addEvent(new MidiWriter.NoteEvent({ pitch: notes, duration: 't' + note_time }))
+  }
+  const writer = new MidiWriter.Writer([midi_track])
+  const blob = dataURItoBlob(writer.dataUri())
+  saveAs(blob, 'Recording - ' + dataset.name + '.mid')
+  exporting = false
+}
+
+keys.listen(index => {
+  nx.offset.value = index
+  nx.offset.update(index)
+})