add conway life

1 files changed, 90 insertions, 18 deletions

diff --git a/client/index.js b/client/index.js
index a1e0828..409ab8e 100644
--- a/client/index.js
+++ b/client/index.js
@@ -1,8 +1,16 @@
 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 } from './lib/util'
 
+let instrument = kalimba
+let hash = window.location.hash || window.location.search
+if (hash.match('sin') || hash.match('organ')) {
+  instrument = organ
+}
+
 const root = 440
 const s = 50
 const w = window.innerWidth
@@ -15,6 +23,7 @@ const add_off = 0.1
 const mul_off = 0.9
 
 let dragging = false
+let erasing = false
 let lastFreq = 0
 let notes = []
 
@@ -25,43 +34,73 @@ requestAudioContext( () => {
       notes[i][j] = add(i, j)
     }
   }
+  life.init(notes, assign)
 })
 
-function add (x, y) {
-  const i = x + 1
-  const j = y + 1
+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)
+}
+
+function add (i, j) {
+  const a = i + 1
+  const b = j + 1
   const div = document.createElement('div')
-  const freq = root * i/j
+  const frequency = root * a/b
   let add = 0
-  let frac = Math.log2(i/j) % 1
-  div.style.left = (x * s) + 'px'
-  div.style.top = (y * s) + 'px'
-  div.innerHTML = `<div>${i}<\/div><div>\/</div><div>${j}<\/div>`
+  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 (i < j) {
-    add = -Math.log(j/i) / 3.5
+  if (a < b) {
+    add = -Math.log(b/a) / 3.5
   }
   else {
-    add = Math.log(i/j) / 6
+    add = Math.log(a/b) / 6
   }
   if ( frac === 0) {
     div.style.fontWeight = '900'
-    div.style.left = (x * s) + 'px'
-    div.style.top = (y * s) + 'px'
+    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)
-      kalimba.play( freq )
+      toggle( freq )
+      erasing = !freq.playing
     })
     div.addEventListener('mouseenter', function(){
       div.style.backgroundColor = color(frac, add + add_on, mul_on)
       if (dragging) {
-        kalimba.play( freq )
+        if (erasing) {
+          pause( freq )
+        } else {
+          toggle( freq )
+        }
       }
     })
     div.addEventListener('mouseleave', function(){
@@ -71,7 +110,8 @@ function add (x, y) {
 	else {
     div.addEventListener('touchstart', function(e){
 			e.preventDefault()
-      kalimba.play( freq )
+      toggle( freq )
+      erasing = !freq.playing
 			lastFreq = freq
     })
 	}
@@ -92,16 +132,48 @@ else {
 		if (! (x in notes) || ! (y in notes[x])) return
 		const freq = notes[x][y]
 		if (freq !== lastFreq) {
-			kalimba.play( freq )
+      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)
+  switch (e.keyCode){
+    case 32: // space
+      life.toggle()
+      break
+    case 38: // up
+      life_bpm += e.shiftKey ? 1 : 5
+      life_bpm = Math.max(1, life_bpm)
+      life.setTempo(life_bpm)
+      break
+    case 40: // down
+      life_bpm -= e.shiftKey ? 1 : 5
+      life.setTempo(life_bpm)
+      break
+    case 83: // s
+      swap_instrument()
+      break
+  }
+}
 keys.listen(function(index){
   // const freq = scales.current().index(index)
   // document.body.style.backgroundColor = color( index / scales.current().scale.length )
-  // kalimba.play(freq)
+  // instrument.toggle(freq)
 })