From f249c1dbe5a1dce198a025249bcbec9bcfdcbd6e Mon Sep 17 00:00:00 2001
From: Oliver Bryan <ob248@proton.me>
Date: Sat, 31 Jan 2026 15:54:59 +0000
Subject: [PATCH] waveform visualiser

---
 src/Index.tsx                    |   2 +-
 src/Layout.tsx                   |   8 +-
 src/components/AudioWaveform.tsx | 132 +++++++++++++++++++++++++++++++
 3 files changed, 140 insertions(+), 2 deletions(-)
 create mode 100644 src/components/AudioWaveform.tsx

diff --git a/src/Index.tsx b/src/Index.tsx
index 88351b7..3cb0d54 100644
--- a/src/Index.tsx
+++ b/src/Index.tsx
@@ -282,7 +282,7 @@ function Index() {
     );
 
     return (
-        <Layout sidebarContent={sidebarContent}>
+        <Layout sidebarContent={sidebarContent} waveformColor={state.color}>
             <ShapeCanvas state={state} onStateChange={setState} />
         </Layout>
     );
diff --git a/src/Layout.tsx b/src/Layout.tsx
index 0a12e03..69f93a5 100644
--- a/src/Layout.tsx
+++ b/src/Layout.tsx
@@ -1,3 +1,4 @@
+import AudioWaveform from "@/components/AudioWaveform";
 import ThemeToggle from "@/components/theme-toggle";
 import { Button } from "@/components/ui/button";
 import { Home, Settings } from "lucide-react";
@@ -6,9 +7,11 @@ import { Link, useLocation } from "react-router-dom";
 export default function Layout({
     children,
     sidebarContent,
+    waveformColor,
 }: {
     children: React.ReactNode;
     sidebarContent?: React.ReactNode;
+    waveformColor?: string;
 }) {
     const location = useLocation();
 
@@ -20,7 +23,10 @@ export default function Layout({
                     <img src="/icon.png" alt="" aria-hidden="true" className="size-8" />
                     <h1 className="text-2xl font-semibold">The Shape of Sound</h1>
                 </div>
-                <div className="flex-1">{sidebarContent || null}</div>
+                <div className="flex-1 overflow-y-auto">{sidebarContent || null}</div>
+
+                {/* Audio Waveform Visualization */}
+                <AudioWaveform color={waveformColor} />
 
                 <div className="flex items-center gap-4">
                     <ThemeToggle className="rounded-lg" />
diff --git a/src/components/AudioWaveform.tsx b/src/components/AudioWaveform.tsx
new file mode 100644
index 0000000..49d5e52
--- /dev/null
+++ b/src/components/AudioWaveform.tsx
@@ -0,0 +1,132 @@
+import { useEffect, useRef } from "react";
+import * as Tone from "tone";
+
+export default function AudioWaveform({ color }: { color?: string }) {
+    const canvasRef = useRef<HTMLCanvasElement>(null);
+    const analyzerRef = useRef<Tone.Waveform | null>(null);
+    const animationFrameRef = useRef<number | null>(null);
+
+    useEffect(() => {
+        // create analyzer and connect to destination
+        const analyzer = new Tone.Waveform(512);
+        Tone.getDestination().connect(analyzer);
+        analyzerRef.current = analyzer;
+
+        const canvas = canvasRef.current;
+        if (!canvas) return;
+
+        const ctx = canvas.getContext("2d");
+        if (!ctx) return;
+
+        // Set canvas size
+        const updateCanvasSize = () => {
+            const dpr = window.devicePixelRatio || 1;
+            const rect = canvas.getBoundingClientRect();
+            canvas.width = rect.width * dpr;
+            canvas.height = rect.height * dpr;
+            ctx.scale(dpr, dpr);
+        };
+
+        updateCanvasSize();
+        window.addEventListener("resize", updateCanvasSize);
+
+        // Animation loop
+        const draw = () => {
+            if (!canvas || !ctx || !analyzerRef.current) return;
+
+            const values = analyzerRef.current.getValue();
+            const width = canvas.getBoundingClientRect().width;
+            const height = canvas.getBoundingClientRect().height;
+
+            ctx.clearRect(0, 0, width, height);
+
+            let strokeColor = color || "#caa3ff";
+            if (!color) {
+                const computedStyle = getComputedStyle(canvas);
+                const primaryColor = computedStyle.getPropertyValue("--primary") || "210 100% 50%";
+                
+                // Convert HSL to RGB for canvas
+                const hslMatch = primaryColor.match(/(\d+)\s+(\d+)%\s+(\d+)%/);
+                
+                if (hslMatch) {
+                    const h = Number.parseInt(hslMatch[1]);
+                    const s = Number.parseInt(hslMatch[2]) / 100;
+                    const l = Number.parseInt(hslMatch[3]) / 100;
+                    
+                    // HSL to RGB conversion
+                    const c = (1 - Math.abs(2 * l - 1)) * s;
+                    const x = c * (1 - Math.abs(((h / 60) % 2) - 1));
+                    const m = l - c / 2;
+                    
+                    let r = 0;
+                    let g = 0;
+                    let b = 0;
+                    
+                    if (h >= 0 && h < 60) {
+                        r = c; g = x; b = 0;
+                    } else if (h >= 60 && h < 120) {
+                        r = x; g = c; b = 0;
+                    } else if (h >= 120 && h < 180) {
+                        r = 0; g = c; b = x;
+                    } else if (h >= 180 && h < 240) {
+                        r = 0; g = x; b = c;
+                    } else if (h >= 240 && h < 300) {
+                        r = x; g = 0; b = c;
+                    } else {
+                        r = c; g = 0; b = x;
+                    }
+                    
+                    strokeColor = `rgb(${Math.round((r + m) * 255)}, ${Math.round((g + m) * 255)}, ${Math.round((b + m) * 255)})`;
+                }
+            }
+
+            ctx.beginPath();
+            ctx.strokeStyle = strokeColor;
+            ctx.lineWidth = 2;
+
+            const sliceWidth = width / values.length;
+            let x = 0;
+
+            for (let i = 0; i < values.length; i++) {
+                const value = values[i] as number;
+                // multiplied amplitude for more prominent visualisation
+                const amplifiedValue = Math.max(-1, Math.min(1, value * 5));
+                const y = ((amplifiedValue + 1) / 2) * height;
+
+                if (i === 0) {
+                    ctx.moveTo(x, y);
+                } else {
+                    ctx.lineTo(x, y);
+                }
+
+                x += sliceWidth;
+            }
+
+            ctx.stroke();
+
+            animationFrameRef.current = requestAnimationFrame(draw);
+        };
+
+        draw();
+
+        return () => {
+            if (animationFrameRef.current) {
+                cancelAnimationFrame(animationFrameRef.current);
+            }
+            if (analyzerRef.current) {
+                analyzerRef.current.dispose();
+            }
+            window.removeEventListener("resize", updateCanvasSize);
+        };
+    }, [color]);
+
+    return (
+        <div className="w-full h-20 rounded-lg border bg-card/50 overflow-hidden">
+            <canvas
+                ref={canvasRef}
+                className="w-full h-full"
+                style={{ display: "block" }}
+            />
+        </div>
+    );
+}