From ee6ca5b32ea7e02a98e7cf5f150636a8d31b60cc Mon Sep 17 00:00:00 2001
From: s-ol <s+removethis@s-ol.nu>
Date: Sat, 2 Sep 2023 13:41:09 +0200
Subject: add synth panel

---
 index.html | 87 ++++++++++++++++++++++++++++++++++++++------------------------
 layout.js  |  4 +--
 pattern.js |  4 +--
 style.css  | 31 +++++++++++++++++-----
 synth.js   | 41 ++++++++++++++++++++++++++---
 5 files changed, 121 insertions(+), 46 deletions(-)

diff --git a/index.html b/index.html
index 6ada1a8..ca5ebe7 100644
--- a/index.html
+++ b/index.html
@@ -10,37 +10,58 @@
     <canvas id="canvas-bg"></canvas>
     <canvas id="canvas-fg"></canvas>
   </main>
-  <aside class="pattern controls">
-    <div class="control control--preset">
-      <label for="pattern-preset">pattern</label>
-      <select id="pattern-preset">
-        <option value="custom">(custom)</option>
-        <optgroup label="scales">
-          <option value="major-7"     >major</option>
-          <option value="minor-7"     >minor</option>
-          <option value="minor-harm-7">harmonic minor</option>
-          <option value="minor-mel-7" >melodic minor</option>
-          <option value="minor-hung-7">hungarian minor</option>
-          <option value="penta"       >pentatonic</option>
-        </optgroup>
-        <optgroup label="triads">
-          <option value="major-3" >major</option>
-          <option value="major-3+">augmented</option>
-          <option value="minor-3" >minor</option>
-          <option value="minor-3-">diminished</option>
-        </optgroup>
-      </select>
-    </div>
-    <div class="control">
-      <label for="pattern-len">octave size</label>
-      <input id="pattern-len" type="number" min="4" value="12" />
-    </div>
-    <div class="steps">
-      <input type="checkbox" checked disabled />
-      <input type="checkbox" />
-      <input type="checkbox" />
-      <input type="checkbox" />
-    </div>
+  <aside class="pattern panel">
+    <section id="pattern" class="controls">
+      <div class="control control--preset">
+        <label for="pattern-preset">pattern</label>
+        <select id="pattern-preset">
+          <option value="custom">(custom)</option>
+          <optgroup label="scales">
+            <option value="major-7"     >major</option>
+            <option value="minor-7"     >minor</option>
+            <option value="minor-harm-7">harmonic minor</option>
+            <option value="minor-mel-7" >melodic minor</option>
+            <option value="minor-hung-7">hungarian minor</option>
+            <option value="penta"       >pentatonic</option>
+          </optgroup>
+          <optgroup label="triads">
+            <option value="major-3" >major</option>
+            <option value="major-3+">augmented</option>
+            <option value="minor-3" >minor</option>
+            <option value="minor-3-">diminished</option>
+          </optgroup>
+        </select>
+      </div>
+      <div class="control">
+        <label for="pattern-len">octave size</label>
+        <input id="pattern-len" type="number" min="4" value="12" />
+      </div>
+      <div class="steps">
+        <input type="checkbox" checked disabled />
+        <input type="checkbox" />
+        <input type="checkbox" />
+        <input type="checkbox" />
+      </div>
+    </section>
+    <section id="synth" class="controls">
+      <div class="control control--toggle">
+        <label for="synth-enabled">synth</label>
+        <input id="synth-enabled" type="checkbox" checked />
+      </div>
+      <div class="control">
+        <label for="synth-freq">center freq</label>
+        <input id="synth-freq" type="number" min="0" value="110" />
+      </div>
+      <div class="control">
+        <label for="synth-voices">voices</label>
+        <input id="synth-voices" type="number" min="1" max="32" value="8" />
+      </div>
+      <div class="control control--toggle">
+        <label><a href="synth.html" target="_blank">options</a></label>
+        <button id="synth-opts-paste">paste</button>
+        <button id="synth-opts-reset">reset</button>
+      </div>
+    </section>
   </aside>
   <aside class="layout">
     <svg
@@ -97,7 +118,7 @@
         id="turn-cw" class="turn" transform="rotate(1.5)"
         d="M 63.875 -112.84961 L 59.068359 -104.08203 C 69.570355 -98.323686 70.491716 -97.891327 78.669922 -89.982422 L 74.099609 -85.28125 L 96.498047 -79.628906 L 95.910156 -81.712891 L 90.216797 -101.85938 L 85.628906 -97.140625 C 76.875667 -105.51066 74.458477 -107.04659 63.875 -112.84961 z " />
     </svg>
-    <div class="controls">
+    <section id="layout" class="panel controls">
       <div class="control control--preset">
         <label for="layout-preset">layout</label>
         <select id="layout-preset">
@@ -132,7 +153,7 @@
           invert
         </label>
       </div>
-    </div>
+    </section>
   </aside>
   <script type="module" src="main.js"></script>
 </body>
diff --git a/layout.js b/layout.js
index 31edf7b..f00c806 100644
--- a/layout.js
+++ b/layout.js
@@ -1,9 +1,9 @@
-const panel = document.querySelector('aside.layout');
+const panel = document.getElementById('layout');
 
 const svg = document.getElementById('diagram');
 const arrows = Array.from(svg.querySelectorAll('.arrow'));
 
-const preset = panel.querySelector('.control--preset select');
+const preset = document.getElementById('layout-preset');
 const controls = Array.from(panel.querySelectorAll('.control--axis'));
 const steps = Array.from(panel.querySelectorAll('.control--axis > input'));
 const dirs = Array.from(panel.querySelectorAll('.control--axis .dir input'));
diff --git a/pattern.js b/pattern.js
index 14ad005..23abfa9 100644
--- a/pattern.js
+++ b/pattern.js
@@ -1,6 +1,6 @@
-const panel = document.querySelector('aside.pattern');
+const panel = document.getElementById('pattern');
 
-const preset = panel.querySelector('.control--preset select');
+const preset = document.getElementById('pattern-preset');
 const patternLength = document.getElementById('pattern-len');
 const steps = panel.querySelector('.steps');
 
diff --git a/style.css b/style.css
index 3d00049..1fe469d 100644
--- a/style.css
+++ b/style.css
@@ -54,15 +54,35 @@ aside.layout > svg {
   height: 100%;
 }
 
-.controls {
+.panel {
   display: flex;
   flex-direction: column;
-  justify-content: center;
+  gap: 0.75rem;
   padding: 1rem 1.5rem;
-  gap: 0.25rem;
   background: #eeeeee;
 }
 
+.panel section + section {
+  padding-top: 0.3rem;
+  border-top: 1px solid #b9bdc1;
+}
+
+.controls {
+  display: flex;
+  flex-direction: column;
+  justify-content: flex-start;
+  overflow: hidden;
+  gap: 0.25rem;
+}
+
+.controls--minimized {
+  max-height: 1.25em;
+}
+
+#layout.controls {
+  justify-content: center;
+}
+
 /* controls */
 .control {
   display: flex;
@@ -77,8 +97,6 @@ aside.layout > svg {
 }
 
 .control--preset {
-  padding-bottom: 0.5rem;
-  border-bottom: 1px solid #b9bdc1;
   margin-bottom: 0.25rem;
 }
 
@@ -86,10 +104,11 @@ aside.layout > svg {
   flex: 1;
 }
 
-.control--preset label:first-child {
+.controls .control:first-child label:first-child {
   font-weight: bold;
 }
 
+.control--toggle label:first-child,
 .control--axis label:first-child {
   flex: 1;
 }
diff --git a/synth.js b/synth.js
index 74dc051..fdf2f87 100644
--- a/synth.js
+++ b/synth.js
@@ -1,6 +1,13 @@
 import SimpleJSSynth from './simple-js-synth.js';
 import * as pattern from './pattern.js';
 
+const panel = document.getElementById('synth');
+const enabled = document.getElementById('synth-enabled');
+const freq = document.getElementById('synth-freq');
+const poly = document.getElementById('synth-voices');
+const optsPaste = document.getElementById('synth-opts-paste');
+const optsReset = document.getElementById('synth-opts-reset');
+
 const ctx = new window.AudioContext();
 
 const opts = {};
@@ -19,23 +26,51 @@ export const setOptions = (o) => {
     voices.push(SimpleJSSynth(ctx.destination, opts));
 };
 
-setOptions({
+enabled.onchange = () => {
+  if (enabled.checked) ctx.resume();
+  else ctx.suspend();
+
+  panel.classList.toggle('controls--minimized', !enabled.checked);
+};
+
+freq.onchange = () => {
+  let frequency = +freq.value;
+  if (!frequency || frequency < 1) frequency = 110;
+  opts.frequency = frequency;
+};
+
+poly.onchange = () => {
+  let polyphony = +poly.value;
+  if (!polyphony || polyphony < 1) polyphony = 1;
+  setOptions({ polyphony });
+};
+
+optsPaste.onclick = () => {
+  const json = window.prompt("Please paste the JSON from the right panel of the synth page:");
+  setOptions(JSON.parse(json));
+};
+
+optsReset.onclick = () => setOptions({
   osc1type: "sine", osc1vol: 0.2, osc1tune: 0,
   osc2type: "square", osc2vol: 0.14, osc2tune: 12,
   osc3type: "sine", osc3vol: 0.05, osc3tune: -6.7,
   attack: 0, decay: 0.3, sustain: 0.5, susdecay: 5,
   cutoff: 36,
 
+  frequency: 110,
   polyphony: 8,
 });
 
+optsReset.onclick();
+
 export const on = (key, note, vol=1) => {
-  ctx.resume()
+  if (!enabled.checked) return;
+  ctx.resume();
 
   if (tones[key]?.note === note) return;
   off(key);
 
-  const freq = 110.0 * Math.pow(2, note / pattern.getLength());
+  const freq = opts.frequency * Math.pow(2, note / pattern.getLength());
 
   const voice = voices.find(s => s.isReady());
   if (!voice) return;
-- 
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