Interactive-Drum-Kit #338
Interactive-Drum-Kit #338
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Pull Request Overview
Adds a self-contained interactive Drum Kit example using HTML, CSS, and JavaScript with Web Audio synthesis, playback recording, and simple import/export of patterns.
- Implements drum synthesis and key/mouse interactions
- Adds recording, playback scheduling, and JSON save/load
- Includes UI styling, volume control, and basic accessibility labels
Reviewed Changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.
| File | Description |
|---|---|
| examples/Drum_kit/index.html | Markup for pads, controls, and status; wires in script and styles |
| examples/Drum_kit/styles.css | Visual design, transitions, and animations for pads and controls |
| examples/Drum_kit/script.js | Web Audio synths, event wiring, recording/playback, and JSON I/O |
| examples/Drum_kit/README.md | Instructions, feature list, and usage notes |
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| // metallic tone layering with bandpass filters | ||
| const freqs = [8000, 12000, 10000]; | ||
| let node = src; | ||
| const gains = []; |
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The variable gains is declared but never used in playHiHat. Remove it to avoid confusion or use it to store references if you intend to manage nodes later.
| const gains = []; |
| o.start(time || 0); | ||
| o.stop((time || ctx.currentTime) + 0.6); |
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[nitpick] Use a normalized start time to avoid scheduling with a literal 0 and to match the pattern used elsewhere. For example: const t = (time ?? ctx.currentTime); o.start(t); o.stop(t + 0.6);
| o.start(time || 0); | |
| o.stop((time || ctx.currentTime) + 0.6); | |
| const t = (time ?? ctx.currentTime); | |
| o.start(t); | |
| o.stop(t + 0.6); |
| noise.start(time || 0); | ||
| noise.stop((time || ctx.currentTime) + 0.25); | ||
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| // body | ||
| const osc = ctx.createOscillator(); | ||
| const og = ctx.createGain(); | ||
| osc.type = 'triangle'; | ||
| osc.frequency.setValueAtTime(180, time || ctx.currentTime); | ||
| og.gain.setValueAtTime(0.6, time || ctx.currentTime); | ||
| og.gain.exponentialRampToValueAtTime(0.001, (time || ctx.currentTime) + 0.25); | ||
| osc.connect(og).connect(masterGain || ctx.destination); | ||
| osc.start(time || 0); | ||
| osc.stop((time || ctx.currentTime) + 0.3); |
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[nitpick] Normalize the schedule time once and reuse it to improve clarity and avoid mixed patterns (time || 0 vs time || ctx.currentTime). Suggestion: const t = (time ?? ctx.currentTime); then use t for all start/stop and parameter automation.
| if(!audioCtx){ | ||
| audioCtx = new (window.AudioContext || window.webkitAudioContext)(); | ||
| masterGain = audioCtx.createGain(); | ||
| masterGain.gain.value = 0.9; // master volume |
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[nitpick] Initialize masterGain from the current slider value so the initial UI state reflects the actual volume. For example: const initial = (typeof volumeSlider !== 'undefined' && volumeSlider) ? (volumeSlider.value/100) : 0.9; masterGain.gain.value = initial;
| masterGain.gain.value = 0.9; // master volume | |
| const initial = (typeof volumeSlider !== 'undefined' && volumeSlider) ? (volumeSlider.value/100) : 0.9; | |
| masterGain.gain.value = initial; // master volume |
| cursor:pointer; | ||
| color:#222; | ||
| font-weight:600; | ||
| transition: all 0.2s ease; |
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[nitpick] Avoid transition: all; as it can trigger unnecessary repaints/reflows. Limit to the properties that actually change, e.g.: transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, color 0.2s ease;
| transition: all 0.2s ease; | |
| transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, color 0.2s ease; |
| @keyframes recordPulse{ | ||
| 0%, 100%{opacity:1} | ||
| 50%{opacity:0.6} | ||
| } |
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[nitpick] Respect prefers-reduced-motion to reduce or remove animations for users who request it. Suggested addition below these rules: @media (prefers-reduced-motion: reduce) { .pulse, .status.recording { animation: none; } .drum, .controls button { transition: none; } }
| } | |
| } | |
| /* Respect user preference for reduced motion */ | |
| @media (prefers-reduced-motion: reduce) { | |
| .pulse, | |
| .status.recording { | |
| animation: none !important; | |
| } | |
| .drum, | |
| .controls button, | |
| .volume-control input[type="range"]::-webkit-slider-thumb, | |
| .volume-control input[type="range"]::-moz-range-thumb { | |
| transition: none !important; | |
| } | |
| } |
| - Record a short sequence and play it back. | ||
| - Adjustable master volume control. | ||
| - Save and load your drum patterns as JSON files. | ||
| - Full keyboard accessibility with ARIA labels and focus indicators.Files |
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Split the concatenated sentence to fix grammar.
| - Full keyboard accessibility with ARIA labels and focus indicators.Files | |
| - Full keyboard accessibility with ARIA labels and focus indicators. | |
| Files |
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| Usage | ||
| 1. Open `index.html` in a browser (Chrome, Firefox, Edge). For best results, open it via a web server (e.g. `python -m http.server`) because some browsers restrict AudioContext on file://. | ||
| 2. Click a pad or press W/A/S/D to play sounds. |
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The key list is incomplete compared to the mapping in script.js and index.html. Update to include all keys, e.g.: 'Click a pad or press W/A/S/D/J/K/L/; to play sounds.'
| 2. Click a pad or press W/A/S/D to play sounds. | |
| 2. Click a pad or press W/A/S/D/J/K/L/; to play sounds. |
2 participants
Issue #319
Interactive Drum Kit Using Html, CSS, and JS
Drum-Kit.mp4