From e63f885c7caaf7496d01e37f8ed2769190f8a51e Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Wed, 18 Feb 2026 23:25:46 +0100
Subject: feat(mq_editor): partial spectrum viewer — synth+FFT power display
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Adds a 200×100 canvas (left of the main spectrum overlay) that shows
the synthesised power spectrum of the selected partial at the time
under the mouse (or playhead).

Pipeline: synthesizeMQ → Hann window → FFT (2048-pt) → dB power bars.
- freqCurve times are shifted so the synthesis window is centred on t
- X-axis: log-frequency (same scale as main view)
- Y-axis: dB, normalised to peak of the synthesised frame
- Cache: {partialIndex, time} → avoids re-synthesis on mouse move;
  bypassed (force=true) from render() so param changes always redraw

handoff(Claude): partial spectrum viewer complete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 tools/mq_editor/index.html | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'tools/mq_editor/index.html')

diff --git a/tools/mq_editor/index.html b/tools/mq_editor/index.html
index 605d91a..efbd73d 100644
--- a/tools/mq_editor/index.html
+++ b/tools/mq_editor/index.html
@@ -82,6 +82,10 @@
         <canvas id="cursorCanvas" width="1400" height="600"></canvas>
         <canvas id="playheadCanvas" width="1400" height="600"></canvas>
 
+        <!-- Partial spectrum viewer (bottom-right overlay, left of main spectrum) -->
+        <div id="partialSpectrumViewer">
+          <canvas id="partialSpectrumCanvas" width="200" height="100"></canvas>
+        </div>
         <!-- Mini spectrum viewer (bottom-right overlay) -->
         <div id="spectrumViewer">
           <canvas id="spectrumCanvas" width="400" height="100"></canvas>
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