synthtracers/synth.html at main · s4mw1se/synthtracers · GitHub

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<!DOCTYPE html>
<html>

<head>
    <title>Synesthesia Synthesizer</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            background-color: #000;
            color: #fff;
            font-family: Arial, sans-serif;
        }

        canvas {
            display: block;
        }

        .keys {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .key {
            width: 50px;
            height: 200px;
            background-color: #fff;
            border: 2px solid #000;
            margin: 0 5px;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 24px;
            font-weight: bold;
            color: #000;
        }
    </style>
</head>

<body>
    <canvas id="canvas"></canvas>
    <div class="keys">
        <div class="key" data-note="C4">C4</div>
        <div class="key" data-note="D4">D4</div>
        <div class="key" data-note="E4">E4</div>
        <div class="key" data-note="F4">F4</div>
        <div class="key" data-note="G4">G4</div>
        <div class="key" data-note="A4">A4</div>
        <div class="key" data-note="B4">B4</div>
      </div>
    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;

        const keys = document.querySelectorAll('.key');
        const audioContext = new AudioContext();
        const analyser = audioContext.createAnalyser();
        analyser.fftSize = 2048;
        const bufferLength = analyser.frequencyBinCount;
        const dataArray = new Uint8Array(bufferLength);

        const shapes = [];

        keys.forEach(key => {
            key.addEventListener('mousedown', () => {
                const note = key.dataset.note;
                playNote(note);
            });

            key.addEventListener('mouseup', () => {
                audioContext.suspend();
            });
        });

        function playNote(note) {
            audioContext.resume();
            const frequency = getFrequency(note);
            const oscillator = audioContext.createOscillator();
            oscillator.type = 'sine';
            oscillator.frequency.value = frequency;
            oscillator.connect(analyser);
            analyser.connect(audioContext.destination);
            oscillator.start();

            const shape = new Shape(frequency);
            shapes.push(shape);
        }

        function getFrequency(note) {
            const noteFrequencies = {
                'C4': 261.63,
                'D4': 293.66,
                'E4': 329.63,
                'F4': 349.23,
                'G4': 392.00,
                'A4': 440.00,
                'B4': 493.88
            };
            return noteFrequencies[note];
        }

        class Shape {
            constructor(frequency) {
                this.x = canvas.width / 2;
                this.y = canvas.height / 2;
                this.size = 10 + frequency / 10;
                this.color = `hsl(${frequency}, 100%, 50%)`;
                this.speed = 2 + frequency / 100;
                this.direction = Math.random() * Math.PI * 2;
                this.tracers = [];
                this.geometry = this.createSacredGeometry();
              }

              createSacredGeometry() {
                const geometry = new Path2D();
                const numPoints = 6;
                const radius = this.size;
                const angle = (Math.PI * 2) / numPoints;

                geometry.moveTo(
                  this.x + radius * Math.cos(0),
                  this.y + radius * Math.sin(0)
                );

                for (let i = 1; i <= numPoints; i++) {
                  const x = this.x + radius * Math.cos(i * angle);
                  const y = this.y + radius * Math.sin(i * angle);
                  geometry.lineTo(x, y);
                }

                geometry.closePath();
                return geometry;
              }

              update() {
                this.x += Math.cos(this.direction) * this.speed;
                this.y += Math.sin(this.direction) * this.speed;
                this.tracers.push({ x: this.x, y: this.y });
                if (this.tracers.length > 20) {
                  this.tracers.shift();
                }
              }

              draw() {
                ctx.fillStyle = this.color;
                ctx.fill(this.geometry);

                ctx.strokeStyle = this.color;
                ctx.lineWidth = 2;
                ctx.beginPath();
                this.tracers.forEach((tracer, index) => {
                  if (index === 0) {
                    ctx.moveTo(tracer.x, tracer.y);
                  } else {
                    ctx.lineTo(tracer.x, tracer.y);
                  }
                });
                ctx.stroke();
              }
            }

        function animate() {
            requestAnimationFrame(animate);
            ctx.fillStyle = 'rgba(0, 0, 0, 0.1)';
            ctx.fillRect(0, 0, canvas.width, canvas.height);

            analyser.getByteFrequencyData(dataArray);
            const bass = dataArray[0];
            const mid = dataArray[Math.floor(bufferLength / 2)];
            const treble = dataArray[bufferLength - 1];
            const gradient = ctx.createLinearGradient(0, 0, canvas.width, canvas.height);
            gradient.addColorStop(0, `rgb(${bass}, 0, 0)`);
            gradient.addColorStop(0.5, `rgb(0, ${mid}, 0)`);
            gradient.addColorStop(1, `rgb(0, 0, ${treble})`);
            ctx.strokeStyle = gradient;
            ctx.lineWidth = 5;
            ctx.strokeRect(0, 0, canvas.width, canvas.height);

            shapes.forEach((shape) => {
                shape.update();
                shape.draw();

                if (shape.x < 0) shape.x = canvas.width;
                if (shape.x > canvas.width) shape.x = 0;
                if (shape.y < 0) shape.y = canvas.height;
                if (shape.y > canvas.height) shape.y = 0;
            });
        }

        animate();
    </script>
</body>

</html>