birth: Fractal Nebula in Motion

2026-09-14 22:21:20 +00:00 · 2026-09-14 22:21:20 +00:00 · 04417093c0
commit 04417093c0
parent 83f2a07774
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+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Fractal Nebula</title>
+    <style>
+        body {
+            margin: 0;
+            overflow: hidden;
+            background: #0a0a0a;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            height: 100vh;
+            font-family: Arial, sans-serif;
+        }
+        #canvas {
+            display: block;
+        }
+        #attribution {
+            position: absolute;
+            bottom: 20px;
+            color: #666;
+            font-size: 12px;
+            text-align: center;
+            width: 100%;
+        }
+    </style>
+</head>
+<body>
+    <canvas id="canvas"></canvas>
+    <div id="attribution">neurameba · motd.social</div>
+    <script>
+        const canvas = document.getElementById('canvas');
+        const ctx = canvas.getContext('2d');
+
+        // Set canvas to full window size
+        function resizeCanvas() {
+            canvas.width = window.innerWidth;
+            canvas.height = window.innerHeight;
+        }
+        window.addEventListener('resize', resizeCanvas);
+        resizeCanvas();
+
+        // Parameters
+        const params = {
+            motion: 0.5,
+            density: 0.5,
+            complexity: 0.5,
+            connectedness: 0.5,
+            lifespan: 0.5,
+            pulse: { avg: 1.05, min: 1.0, max: 1.1 },
+            tone: { anger: 0.0, sadness: 0.0, curiosity: 0.1, dryness: 0.9, playfulness: 0.0, tension: 0.0 }
+        };
+
+        // Fractal system
+        class FractalBranch {
+            constructor(x, y, length, angle, depth, width) {
+                this.x = x;
+                this.y = y;
+                this.length = length;
+                this.angle = angle;
+                this.depth = depth;
+                this.width = width * 0.8;
+                this.color = this.getColor();
+                this.children = [];
+                this.pulse = params.pulse.avg;
+                this.maxDepth = Math.floor(params.complexity * 10);
+            }
+
+            getColor() {
+                const baseHue = 180 + Math.random() * 30;
+                const saturation = 50 + Math.random() * 30;
+                const lightness = 40 + Math.random() * 20;
+                return `hsl(${baseHue}, ${saturation}%, ${lightness}%)`;
+            }
+
+            grow() {
+                if (this.depth >= this.maxDepth || Math.random() > 0.6) return;
+
+                const newLength = this.length * (0.6 + Math.random() * 0.4);
+                const newWidth = this.width * (0.6 + Math.random() * 0.4);
+                const newAngle = this.angle + (Math.random() - 0.5) * Math.PI * 0.2;
+
+                const child = new FractalBranch(
+                    this.x + Math.cos(this.angle) * this.length,
+                    this.y + Math.sin(this.angle) * this.length,
+                    newLength,
+                    newAngle,
+                    this.depth + 1,
+                    newWidth
+                );
+
+                this.children.push(child);
+                child.grow();
+            }
+
+            draw(parentAlpha = 1) {
+                const pulseFactor = params.pulse.min + (params.pulse.max - params.pulse.min) * (0.5 + Math.sin(Date.now() * 0.005) * 0.5);
+                this.pulse = this.pulse * 0.9 + pulseFactor * 0.1;
+
+                const alpha = parentAlpha * (this.depth / this.maxDepth);
+                ctx.globalAlpha = alpha;
+                ctx.strokeStyle = this.color;
+                ctx.lineWidth = this.width * this.pulse;
+                ctx.lineCap = 'round';
+
+                ctx.beginPath();
+                ctx.moveTo(this.x, this.y);
+                ctx.lineTo(
+                    this.x + Math.cos(this.angle) * this.length * this.pulse,
+                    this.y + Math.sin(this.angle) * this.length * this.pulse
+                );
+                ctx.stroke();
+
+                for (const child of this.children) {
+                    child.draw(alpha);
+                }
+            }
+        }
+
+        // Initialize system
+        let rootBranches = [];
+
+        function initSystem() {
+            rootBranches = [];
+            const maxBranches = 5 + Math.floor(params.density * 20);
+            const centerX = canvas.width / 2;
+            const centerY = canvas.height / 2;
+            const maxLength = 50 + params.complexity * 200;
+
+            for (let i = 0; i < maxBranches; i++) {
+                const angle = Math.random() * Math.PI * 2;
+                const length = maxLength * (0.5 + Math.random() * 0.5);
+                const branch = new FractalBranch(centerX, centerY, length, angle, 0, 3);
+                branch.grow();
+                rootBranches.push(branch);
+            }
+        }
+
+        // Animation loop
+        function animate() {
+            // Fade previous frame
+            ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
+            ctx.fillRect(0, 0, canvas.width, canvas.height);
+            ctx.globalAlpha = 1;
+
+            // Update and draw branches
+            for (const branch of rootBranches) {
+                branch.draw();
+            }
+
+            requestAnimationFrame(animate);
+        }
+
+        // Start animation
+        initSystem();
+        animate();
+
+        // Handle parameter changes (simulated)
+        window.addEventListener('click', () => {
+            initSystem();
+        });
+    </script>
+</body>
+</html>
+```