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Script

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Advanced Hand Tracking AR</title>
    
    <!-- MediaPipe Hands CDN -->
    <script src="https://cdn.jsdelivr.net/npm/@mediapipe/camera_utils/camera_utils.js" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/@mediapipe/control_utils/control_utils.js" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/@mediapipe/drawing_utils/drawing_utils.js" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/@mediapipe/hands/hands.js" crossorigin="anonymous"></script>

    <style>
        :root {
            --bg-color: #050510;
            --text-color: #ffffff;
            --glass-bg: rgba(20, 25, 40, 0.4);
            --glass-border: rgba(255, 255, 255, 0.15);
            --glass-blur: blur(16px);
            --accent: #00ffcc;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            overflow: hidden;
        }

        .video-container {
            position: absolute;
            width: 100vw;
            height: 100vh;
        }

        .input_video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transform: scaleX(-1); /* Mirror */
            z-index: 0; /* Let the raw camera sit behind */
            filter: brightness(0.6) contrast(1.1); /* Subtle dark to make neon pop */
        }

        /* 
         * Background Canvas captures the video frame and applies the matrix rain/starfield 
         */
        #bgCanvas, #mainCanvas {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transform: scaleX(-1); /* Mirror */
        }
        
        #bgCanvas {
            z-index: 1;
            pointer-events: none;
        }

        #mainCanvas {
            z-index: 5;
            pointer-events: none;
            /* We use mix-blend-mode for the glowing effects in canvas */
        }

        /* UI Overlays */
        #hud {
            position: absolute;
            top: 20px;
            left: 20px;
            z-index: 10;
            display: flex;
            flex-direction: column;
            gap: 15px;
            pointer-events: none;
        }

        .panel {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: 1px solid var(--glass-border);
            border-radius: 12px;
            padding: 15px 20px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
        }

        .stat {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.8);
            min-width: 180px;
        }
        .stat:last-child { margin-bottom: 0; }
        .stat span.val { font-weight: bold; color: var(--accent); }

        /* Themes */
        #themes {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 10;
            display: flex;
            gap: 10px;
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            border: 1px solid var(--glass-border);
            border-radius: 30px;
            padding: 8px;
            transition: opacity 0.5s;
        }

        .theme-btn {
            background: transparent;
            border: 1px solid transparent;
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            cursor: pointer;
            transition: 0.3s ease;
            font-weight: 500;
        }
        
        .theme-btn.active {
            background: rgba(255,255,255,0.15);
            border-color: rgba(255,255,255,0.3);
            text-shadow: 0 0 10px white;
        }

        /* Start Overlay */
        #startOverlay {
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.85);
            z-index: 100;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(10px);
            transition: opacity 0.5s ease;
        }

        .start-btn {
            padding: 16px 40px;
            font-size: 1.2rem;
            background: linear-gradient(45deg, #ff00cc, #3333ff);
            border: none;
            color: white;
            border-radius: 30px;
            cursor: pointer;
            box-shadow: 0 0 20px rgba(255, 0, 204, 0.5);
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            transition: transform 0.2s;
        }
        .start-btn:hover { transform: scale(1.05); }

        .hidden { opacity: 0; pointer-events: none; }
    </style>
</head>
<body>

    <!-- Start Overlay (Required for AudioContext initialization) -->
    <div id="startOverlay">
        <h1 style="margin-bottom: 20px; font-weight: 300; letter-spacing: 4px;">NEON AURA AR</h1>
        <p style="margin-bottom: 40px; color: #888;">Grant camera permissions and click to start audio/visual experience</p>
        <button class="start-btn" id="startBtn">Enter Experience</button>
    </div>

    <div class="video-container">
        <video class="input_video" autoplay playsinline></video>
        <canvas id="bgCanvas"></canvas>
        <canvas id="mainCanvas"></canvas>
    </div>

    <!-- UI Overlay -->
    <div id="hud" class="hidden">
        <div class="panel">
            <div class="stat">Hands Detected: <span class="val" id="ui-hands">0</span></div>
            <div class="stat">FPS: <span class="val" id="ui-fps">0</span></div>
        </div>
        <div class="panel">
            <div class="stat">Gesture: <span class="val" id="ui-gesture">None</span></div>
            <div class="stat">Spread: <span class="val" id="ui-spread">0%</span></div>
        </div>
    </div>

    <div id="themes" class="hidden">
        <button class="theme-btn active" data-theme="Rainbow">Rainbow</button>
        <button class="theme-btn" data-theme="Cyberpunk">Cyberpunk</button>
        <button class="theme-btn" data-theme="Lava">Lava</button>
        <button class="theme-btn" data-theme="Ocean">Ocean</button>
        <button class="theme-btn" data-theme="Galaxy">Galaxy</button>
    </div>

<script>
/** 
 * GLOBALS & CONFIG
 */
const videoElement = document.querySelector('.input_video');
const bgCanvas = document.getElementById('bgCanvas');
const mainCanvas = document.getElementById('mainCanvas');
const bgCtx = bgCanvas.getContext('2d');
const ctx = mainCanvas.getContext('2d');

let width = window.innerWidth;
let height = window.innerHeight;

let time = 0;
let lastTime = performance.now();
let framesThisSecond = 0;
let lastFpsTime = performance.now();

let currentHands = []; // Latest data from MediaPipe
let handVelocities = 0; // Average hand movement speed

// Theme Config
let currentTheme = 'Rainbow';
const themes = {
    'Rainbow':   (t, index, total) => `hsl(${(t * 100 + index * (360/total)) % 360}, 100%, 60%)`,
    'Cyberpunk': (t, index, total) => (index % 2 === 0) ? '#ff003c' : '#00f0ff',
    'Lava':      (t, index, total) => `hsl(${(10 + (index * 10)) % 40}, 100%, ${50 + Math.sin(t)*10}%)`,
    'Ocean':     (t, index, total) => `hsl(${180 + (index * 20)}, 100%, 60%)`,
    'Galaxy':    (t, index, total) => `hsl(${260 + Math.sin(t*2 + index)*40}, 100%, 65%)`
};

// Physics Engines Data
let particles = [];
let ripples = [];
const FINGER_TIPS = [4, 8, 12, 16, 20];

// Matrix Background
let matrixColumns = [];
const fontSize = 16;
let maxColumns = 0;

// Audio Node References
let audioCtx = null;
let humOsc = null;
let humGain = null;

// UI Elements
const uiHands = document.getElementById('ui-hands');
const uiFps = document.getElementById('ui-fps');
const uiGesture = document.getElementById('ui-gesture');
const uiSpread = document.getElementById('ui-spread');

/**
 * INITIALIZATION
 */
function resize() {
    width = window.innerWidth;
    height = window.innerHeight;
    bgCanvas.width = width;
    bgCanvas.height = height;
    mainCanvas.width = width;
    mainCanvas.height = height;
    
    maxColumns = Math.floor(width / fontSize);
    matrixColumns = new Array(maxColumns).fill(1).map(() => Math.random() * height/fontSize);
}
window.addEventListener('resize', resize);
resize();

// UI Theme Switcher
document.querySelectorAll('.theme-btn').forEach(btn => {
    btn.addEventListener('click', (e) => {
        document.querySelectorAll('.theme-btn').forEach(b => b.classList.remove('active'));
        e.target.classList.add('active');
        currentTheme = e.target.getAttribute('data-theme');
        document.documentElement.style.setProperty('--accent', themes[currentTheme](0, 1, 1));
    });
});

// Start button triggers AudioContext and hides overlay
document.getElementById('startBtn').addEventListener('click', () => {
    document.getElementById('startOverlay').classList.add('hidden');
    document.getElementById('hud').classList.remove('hidden');
    document.getElementById('themes').classList.remove('hidden');
    initAudio();
    initMediaPipe();
    requestAnimationFrame(renderLoop);
});


/**
 * AUDIO ENGINE
 */
function initAudio() {
    try {
        audioCtx = new (window.AudioContext || window.webkitAudioContext)();
        
        // Continuous Hum
        humOsc = audioCtx.createOscillator();
        humGain = audioCtx.createGain();
        
        humOsc.type = 'sine';
        humOsc.frequency.value = 100;
        
        humGain.gain.value = 0; // Mute until hands are seen
        
        humOsc.connect(humGain);
        humGain.connect(audioCtx.destination);
        humOsc.start();
    } catch(e) {
        console.error("Web Audio API failed", e);
    }
}

function triggerZap() {
    if (!audioCtx) return;
    const osc = audioCtx.createOscillator();
    const gainNode = audioCtx.createGain();
    
    // Zap sound profile
    osc.type = 'sawtooth';
    osc.frequency.setValueAtTime(800, audioCtx.currentTime);
    osc.frequency.exponentialRampToValueAtTime(40, audioCtx.currentTime + 0.1);
    
    gainNode.gain.setValueAtTime(0.5, audioCtx.currentTime);
    gainNode.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.1);
    
    osc.connect(gainNode);
    gainNode.connect(audioCtx.destination);
    
    osc.start();
    osc.stop(audioCtx.currentTime + 0.15);
}

function updateHum(activeHands) {
    if (!audioCtx || !humGain) return;
    if (activeHands.length < 2) {
        humGain.gain.setTargetAtTime(0, audioCtx.currentTime, 0.1);
        return;
    }

    // Measure distance between index fingers to modulate volume
    const p1 = activeHands[0][8];
    const p2 = activeHands[1][8];
    const dx = p1.x - p2.x;
    const dy = p1.y - p2.y;
    const dist = Math.sqrt(dx*dx + dy*dy);
    
    // The closer they are, the higher the pitch and volume
    const targetFreq = 100 + (1 - Math.min(dist, 1)) * 300;
    const targetVolume = 0.05 + (1 - Math.min(dist, 1)) * 0.15;
    
    humOsc.frequency.setTargetAtTime(targetFreq, audioCtx.currentTime, 0.1);
    humGain.gain.setTargetAtTime(targetVolume, audioCtx.currentTime, 0.1);
}

/**
 * MATH & STATE LOGIC
 */
function getDist(p1, p2) {
    return Math.hypot(p1.x - p2.x, p1.y - p2.y);
}

// Convert normalized landmark to specific canvas scale (Note: canvas is horizontally flipped)
function mapToCanvas(point) {
    return { x: point.x * width, y: point.y * height };
}

let lastPinchState = [false, false]; // Prevents rapid re-triggering

function detectGestures() {
    if (!currentHands.length) return;
    
    currentHands.forEach((hand, idx) => {
        // Pinch Detection: Thumb (4) and Index (8)
        const thumb = hand[4];
        const index = hand[8];
        const dist = getDist(thumb, index);
        
        const isPinching = dist < 0.05; // 5% of screen screen distance
        
        if (isPinching && !lastPinchState[idx]) {
            const midpoint = {
                x: (thumb.x + index.x) / 2, 
                y: (thumb.y + index.y) / 2
            };
            createShockwave(mapToCanvas(midpoint), themes[currentTheme](time, 1, 1));
            triggerZap();
            uiGesture.innerText = "PINCH !";
        }
        lastPinchState[idx] = isPinching;
    });

    // Spread Percentage roughly estimated by distance from Palm(0) to Index(8) and Pinky(20)
    if (currentHands[0]) {
        const spread = getDist(currentHands[0][8], currentHands[0][20]);
        // Normalizing spread so max is around 100%
        let spreadPct = Math.min(Math.round(spread * 300), 100);
        uiSpread.innerText = spreadPct + '%';
        if (!lastPinchState.includes(true)) {
            uiGesture.innerText = spreadPct > 50 ? "Open Hand" : "Fist";
        }
    }
}

/**
 * EFFECTS & PHYSICS
 */
function createParticles(pos, color, count = 3) {
    for (let i=0; i<count; i++) {
        particles.push({
            x: pos.x,
            y: pos.y,
            vx: (Math.random() - 0.5) * 8,
            vy: (Math.random() - 0.5) * 8,
            life: 1.0,
            color: color,
            size: Math.random() * 3 + 1
        });
    }
}

function createShockwave(pos, color) {
    ripples.push({
        x: pos.x,
        y: pos.y,
        radius: 0,
        maxRadius: 150 + Math.random() * 100,
        life: 1.0,
        color: color
    });
}

// Background Effect Engine
function drawBackground() {
    // Use destination-out to fade out the previous frame's drops, leaving a transparent trail
    bgCtx.globalCompositeOperation = 'destination-out';
    bgCtx.fillStyle = `rgba(0, 0, 0, ${0.15 + Math.min(handVelocities*10, 0.5)})`;
    bgCtx.fillRect(0, 0, width, height);
    bgCtx.globalCompositeOperation = 'source-over';

    // Matrix Rain Effect mapping to hand speed
    bgCtx.fillStyle = themes[currentTheme](time, 1, 1);
    bgCtx.font = fontSize + "px monospace";
    
    // Matrix speed boosts when hands move fast
    let speedMult = 1 + (handVelocities * 100);

    for (let i = 0; i < matrixColumns.length; i++) {
        // Only draw randomly to keep it sparse like stars/rain
        if (Math.random() > 0.95) {
            const char = String.fromCharCode(0x30A0 + Math.random() * 96);
            bgCtx.fillText(char, i * fontSize, matrixColumns[i] * fontSize);
        }
        
        matrixColumns[i] += Math.random() * speedMult;
        
        if (matrixColumns[i] * fontSize > height && Math.random() > 0.9) {
            matrixColumns[i] = 0;
        }
    }
}

function updatePhysics() {
    // Particles
    for (let i = particles.length - 1; i >= 0; i--) {
        let p = particles[i];
        p.x += p.vx;
        p.y += p.vy;
        p.life -= 0.02;     // Fade out
        p.vy += 0.1;        // Gravity
        
        if (p.life <= 0) {
            particles.splice(i, 1);
        } else {
            ctx.beginPath();
            ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
            ctx.fillStyle = p.color;
            ctx.globalAlpha = p.life;
            ctx.fill();
        }
    }
    
    // Ripples / Shockwaves
    for (let i = ripples.length - 1; i >= 0; i--) {
        let r = ripples[i];
        r.radius += (r.maxRadius - r.radius) * 0.1; // Ease out
        r.life -= 0.03;
        
        if (r.life <= 0) {
            ripples.splice(i, 1);
        } else {
            ctx.beginPath();
            ctx.arc(r.x, r.y, r.radius, 0, Math.PI * 2);
            ctx.strokeStyle = r.color;
            ctx.lineWidth = 4 * r.life;
            ctx.globalAlpha = r.life;
            ctx.stroke();
        }
    }
    ctx.globalAlpha = 1.0; // Reset
}

/**
 * MAIN RENDER PIPELINE
 */
function renderLoop(timestamp) {
    requestAnimationFrame(renderLoop);
    
    let dt = (timestamp - lastTime) / 1000;
    lastTime = timestamp;
    time += dt;

    // Update FPS Counter
    framesThisSecond++;
    if (timestamp > lastFpsTime + 1000) {
        uiFps.innerText = framesThisSecond;
        framesThisSecond = 0;
        lastFpsTime = timestamp;
    }

    drawBackground();

    // The main canvas will clear fully each frame since we handle ghosting via bgCanvas 
    // BUT user requested trailing motion blur for fingertips.
    // Instead of clearRect, we fade the main canvas using destination-out to keep it transparent
    ctx.globalCompositeOperation = 'destination-out';
    ctx.fillStyle = 'rgba(0, 0, 0, 0.2)';
    ctx.fillRect(0, 0, width, height);

    // Enable Screen mode for additive light effects (like neon bloom)
    ctx.globalCompositeOperation = 'screen'; // Creates glowy overlapping effects

    // Render Physics layer
    updatePhysics();

    // Process Hand Logic if present
    if (currentHands.length > 0) {
        
        // 1. Draw Skeleton
        currentHands.forEach((hand, handIndex) => {
            const glowColor = themes[currentTheme](time, handIndex, 2);
            
            // Draw MediaPipe skeleton connectors using custom styles
            drawConnectors(ctx, hand, HAND_CONNECTIONS, {
                color: glowColor,
                lineWidth: 2
            });
            
            // Draw Landmarks with neon bloom
            ctx.shadowBlur = 15;
            ctx.shadowColor = glowColor;
            
            // Only draw fingertips with intense bloom and spawn particles
            FINGER_TIPS.forEach((tipIndex, idx) => {
                const pt = mapToCanvas(hand[tipIndex]);
                const tipCol = themes[currentTheme](time, idx, FINGER_TIPS.length);
                
                ctx.beginPath();
                ctx.arc(pt.x, pt.y, 4, 0, Math.PI * 2);
                ctx.fillStyle = '#fff';
                ctx.fill();

                // Generate constant spark particles at fingertips
                if (Math.random() > 0.6) {
                    createParticles(pt, tipCol, 1);
                }
            });
            ctx.shadowBlur = 0; // Reset
        });

        // 2. Cross-Hand Interactions (Lightning & Gradients)
        if (currentHands.length >= 2) {
            const h1 = currentHands[0];
            const h2 = currentHands[1];

            // A. Rainbow Connecting Lines
            FINGER_TIPS.forEach((tipIndex, idx) => {
                const pt1 = mapToCanvas(h1[tipIndex]);
                const pt2 = mapToCanvas(h2[tipIndex]);
                const dist = getDist(pt1, pt2);
                
                const col = themes[currentTheme](time, idx, FINGER_TIPS.length);
                
                // Lightning electric arc when very close (but not touching)
                if (dist < 150 && Math.random() > 0.5) {
                    // Draw jagged lightning
                    ctx.beginPath();
                    ctx.moveTo(pt1.x, pt1.y);
                    // Midpoint jitter
                    const midX = (pt1.x + pt2.x)/2 + (Math.random() - 0.5) * 50;
                    const midY = (pt1.y + pt2.y)/2 + (Math.random() - 0.5) * 50;
                    ctx.lineTo(midX, midY);
                    ctx.lineTo(pt2.x, pt2.y);
                    
                    ctx.strokeStyle = '#ffffff';
                    ctx.shadowBlur = 20;
                    ctx.shadowColor = col;
                    ctx.lineWidth = 3;
                    ctx.stroke();
                }

                // Normal flowing gradient line
                ctx.beginPath();
                ctx.moveTo(pt1.x, pt1.y);
                ctx.lineTo(pt2.x, pt2.y);
                
                // Create gradient that shifts over time
                let grad = ctx.createLinearGradient(pt1.x, pt1.y, pt2.x, pt2.y);
                grad.addColorStop(0, themes[currentTheme](time, idx, 5));
                grad.addColorStop(0.5, themes[currentTheme](time, idx + 1, 5));
                grad.addColorStop(1, themes[currentTheme](time, idx + 2, 5));
                
                ctx.strokeStyle = grad;
                ctx.lineWidth = 4;
                ctx.shadowBlur = 10;
                ctx.shadowColor = col;
                ctx.stroke();
                ctx.shadowBlur = 0;
            });

            // B. Mandala drawing if 10 tips are perfectly detected
            // (Assuming if we have 2 hands, we draw lines connecting all tips in a star)
            if (h1 && h2) {
                // Combine all 10 tips
                let allTips = FINGER_TIPS.map(t => mapToCanvas(h1[t])).concat(
                              FINGER_TIPS.map(t => mapToCanvas(h2[t])) );
                
                ctx.save();
                // Find center point to draw Mandala
                let cx = allTips.reduce((sum, p) => sum + p.x, 0) / 10;
                let cy = allTips.reduce((sum, p) => sum + p.y, 0) / 10;
                
                ctx.translate(cx, cy);
                ctx.rotate(time * 0.5); // Slow rotation
                
                ctx.beginPath();
                for (let i=0; i<10; i++) {
                    const t1 = { x: allTips[i].x - cx, y: allTips[i].y - cy };
                    const t2 = { x: allTips[(i+3)%10].x - cx, y: allTips[(i+3)%10].y - cy };
                    ctx.moveTo(t1.x, t1.y);
                    ctx.lineTo(t2.x, t2.y);
                }
                ctx.strokeStyle = `rgba(255, 255, 255, 0.2)`;
                ctx.lineWidth = 1;
                ctx.stroke();
                ctx.restore();
            }
        }
        
        detectGestures();
    }
    
    ctx.globalCompositeOperation = 'source-over'; // Restore
}

/**
 * MEDIAPIPE INITIALIZATION
 */
function initMediaPipe() {
    const hands = new Hands({locateFile: (file) => {
        return `https://cdn.jsdelivr.net/npm/@mediapipe/hands/${file}`;
    }});

    hands.setOptions({
        maxNumHands: 2,
        modelComplexity: 1, 
        minDetectionConfidence: 0.7,
        minTrackingConfidence: 0.7
    });

    hands.onResults((results) => {
        if (!audioCtx) return; // Wait for initialization

        // Update global state for render loop to read from
        uiHands.innerText = results.multiHandLandmarks ? results.multiHandLandmarks.length : 0;
        
        // Calculate velocity (rudimentary)
        if (currentHands.length > 0 && results.multiHandLandmarks && results.multiHandLandmarks.length > 0) {
            let vSum = 0;
            // check distance difference on index finger of hand 0 
            const oldP = currentHands[0][8];
            const newP = results.multiHandLandmarks[0][8];
            if (oldP && newP) {
                vSum += getDist(oldP, newP);
                handVelocities = vSum; 
            }
        } else {
            handVelocities = 0;
        }

        currentHands = results.multiHandLandmarks || [];
        updateHum(currentHands);
    });

    const camera = new Camera(videoElement, {
        onFrame: async () => {
            await hands.send({image: videoElement});
        },
        width: 1280,
        height: 720,
        facingMode: 'user'
    });
    
    camera.start();
}

</script>
</body>
</html>
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Network Timeline

Performance Summary

Requests
Domains
56KB
Transfer Size
104KB
Content Size
125.0ms
Dom Content Loaded
400.0ms
First Paint
125.0ms
Load Time
Domain Breakdown

Transfer Size (bytes)
Content Size (bytes)
Header Size (bytes)
Requests
Timings (ms)
Total Time
Content Breakdown

Transfer Size (bytes)
Content Size (bytes)
Header Size (bytes)
Requests