vibes/spacetravel.html at gh-pages · iamtew/vibes · GitHub

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<!DOCTYPE html>
<!--
  spacetravel.html: Drifting starfield for a cinematic OBS backdrop with optional pixelation and dirt effects.
  Use ?colorSpeed= to shift the background palette, ?pixelated= to enable crisp blocky rendering,
  and ?dirt= to add subtle dust overlay texture.
-->
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Celestial Drift: Odyssey Through the Void</title>
    <style>
        html,
        body {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background: #1a1a1a;
            font-family: Arial, sans-serif;
        }
        canvas {
            display: block;
            width: 100vw;
            height: 100vh;
            background: #0a0a0a;
        }
    </style>
</head>
<body>
    <canvas id="canvas"></canvas>
    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');
        let width = 0;
        let height = 0;
        let displayWidth = 0;
        let displayHeight = 0;
        const stars = [];
        let speedFactor = 0.03;
        const pixelScale = 8;
        const bgColors = [
            { h: 280, s: 60, l: 12 }, // purple
            { h: 215, s: 85, l: 15 }, // blue
            { h: 180, s: 80, l: 18 }, // cyan
            { h: 245, s: 65, l: 12 }, // indigo
            { h: 45, s: 100, l: 50 }, // amber
            { h: 320, s: 80, l: 55 }, // magenta
            { h: 340, s: 90, l: 75 }, // pink
        ];
        let currentColorIndex = 0;
        let nextColorIndex = 1;
        let cycleProgress = 0;
        let pixelated = false;
        let dirt = true;
        let noiseCanvas;
        let noiseCtx;

        const query = new URLSearchParams(window.location.search);
        const rawColorSpeed = query.get('colorSpeed') ?? query.get('speed');
        const rawPixelated = query.get('pixelated');
        const rawDirt = query.get('dirt');
        let colorSpeed = 0.002;
        if (rawColorSpeed !== null) {
            const parsed = Number(rawColorSpeed);
            if (!Number.isNaN(parsed) && parsed >= 0) {
                colorSpeed = parsed;
            }
        }
        if (rawPixelated !== null) {
            const normalized = rawPixelated.trim().toLowerCase();
            pixelated = normalized !== 'false' && normalized !== '0' && normalized !== 'no' && normalized !== 'off';
        }
        if (rawDirt !== null) {
            const normalized = rawDirt.trim().toLowerCase();
            dirt = normalized !== 'false' && normalized !== '0' && normalized !== 'no' && normalized !== 'off';
        }

        function resizeCanvas() {
            const displayWidth = window.innerWidth;
            const displayHeight = window.innerHeight;
            width = pixelated ? Math.max(64, Math.floor(displayWidth / pixelScale)) : displayWidth;
            height = pixelated ? Math.max(64, Math.floor(displayHeight / pixelScale)) : displayHeight;
            canvas.width = width;
            canvas.height = height;
            canvas.style.imageRendering = pixelated ? 'pixelated' : 'auto';
            initializeStars();
            if (dirt) {
                createNoiseTexture();
            }
        }

        function createNoiseTexture() {
            if (!noiseCanvas) {
                noiseCanvas = document.createElement('canvas');
                noiseCtx = noiseCanvas.getContext('2d');
            }
            noiseCanvas.width = width;
            noiseCanvas.height = height;
            const imageData = noiseCtx.createImageData(width, height);
            const data = imageData.data;
            for (let i = 0; i < data.length; i += 4) {
                const shade = Math.floor(Math.random() * 48);
                const alpha = Math.floor(Math.random() * 44) + 12;
                data[i] = shade;
                data[i + 1] = shade;
                data[i + 2] = shade;
                data[i + 3] = alpha;
            }
            noiseCtx.putImageData(imageData, 0, 0);
        }

        function interpolateValue(start, end, t) {
            return start + (end - start) * t;
        }

        function hslString(h, s, l) {
            return `hsl(${Math.round(h)}, ${Math.round(s)}%, ${Math.round(l)}%)`;
        }

        function initializeStars() {
            stars.length = 0;
            const starCount = pixelated ? 260 : 700;
            for (let i = 0; i < starCount; i++) {
                const isBright = Math.random() < 0.12;
                stars.push({
                    x: (Math.random() - 0.5) * width * 2,
                    y: (Math.random() - 0.5) * height * 2,
                    z: Math.random() * width,
                    size: Math.random() * 2 + (isBright ? 1.4 : 0.4),
                    hue: Math.random() * 60 + 180,
                    alpha: isBright ? Math.random() * 0.25 + 0.75 : Math.random() * 0.45 + 0.25,
                    isBright,
                });
            }
        }

        function drawBackground() {
            const current = bgColors[currentColorIndex];
            const next = bgColors[nextColorIndex];
            const mixedH = interpolateValue(current.h, next.h, cycleProgress);
            const mixedS = interpolateValue(current.s, next.s, cycleProgress);
            const mixedL = interpolateValue(current.l, next.l, cycleProgress);
            const darkTop = hslString(mixedH, mixedS, 4);
            const darkBottom = hslString(mixedH, mixedS, 3);
            const brightCenter = hslString(mixedH, Math.min(100, mixedS + 20), Math.min(70, mixedL + 45));
            const nearBright = hslString(mixedH, Math.min(100, mixedS + 10), Math.min(55, mixedL + 25));

            const gradient = ctx.createLinearGradient(0, 0, 0, height);
            gradient.addColorStop(0, darkTop);
            gradient.addColorStop(0.35, nearBright);
            gradient.addColorStop(0.5, brightCenter);
            gradient.addColorStop(0.65, nearBright);
            gradient.addColorStop(1, darkBottom);

            ctx.fillStyle = gradient;
            ctx.fillRect(0, 0, width, height);
        }

        function drawCenterStar() {
            const cx = width / 2;
            const cy = height / 2;
            const radius = Math.min(width, height) * 0.05;
            const gradient = ctx.createRadialGradient(cx, cy, 0, cx, cy, radius * 4);
            gradient.addColorStop(0, 'rgba(255, 255, 255, 1)');
            gradient.addColorStop(0.12, 'rgba(220, 240, 255, 0.9)');
            gradient.addColorStop(0.25, 'rgba(220, 240, 255, 0.6)');
            gradient.addColorStop(0.45, 'rgba(180, 210, 255, 0.2)');
            gradient.addColorStop(1, 'rgba(2, 2, 20, 0)');

            ctx.fillStyle = gradient;
            ctx.fillRect(cx - radius * 4, cy - radius * 4, radius * 8, radius * 8);

            ctx.fillStyle = 'rgba(255, 255, 255, 0.95)';
            ctx.beginPath();
            ctx.arc(cx, cy, radius * 0.5, 0, Math.PI * 2);
            ctx.fill();
        }

        function drawStars() {
            const cx = width / 2;
            const cy = height / 2;
            stars.forEach((star) => {
                star.z -= speedFactor * (star.z + 1);
                if (star.z <= 1) {
                    star.x = (Math.random() - 0.5) * width * 2;
                    star.y = (Math.random() - 0.5) * height * 2;
                    star.z = width;
                    star.size = Math.random() * 2 + (star.isBright ? 1.4 : 0.4);
                    star.hue = Math.random() * 60 + 180;
                    star.alpha = star.isBright ? Math.random() * 0.25 + 0.75 : Math.random() * 0.45 + 0.25;
                }

                const px = cx + (star.x / star.z) * width;
                const py = cy + (star.y / star.z) * width;
                const radius = Math.max(1, (1 - star.z / width) * star.size * 4);
                const alpha = Math.min(1, (1 - star.z / width) * 1.2) * star.alpha;

                if (star.isBright) {
                    ctx.shadowBlur = 6;
                    ctx.shadowColor = `hsla(${star.hue}, 90%, 90%, ${alpha})`;
                } else {
                    ctx.shadowBlur = 0;
                }

                ctx.fillStyle = `hsla(${star.hue}, 90%, 90%, ${alpha})`;
                ctx.fillRect(px, py, radius, radius);
                if (star.isBright) {
                    ctx.shadowBlur = 0;
                }
            });
        }

        function drawNebula(x, y, radius, color, offset) {
            const gradient = ctx.createRadialGradient(x, y, 0, x, y, radius);
            gradient.addColorStop(0, color);
            gradient.addColorStop(1, 'rgba(2, 2, 20, 0)');
            ctx.fillStyle = gradient;
            ctx.globalAlpha = 0.8;
            ctx.fillRect(x - radius, y - radius, radius * 2, radius * 2);
            ctx.globalAlpha = 1;
        }

        function animate() {
            cycleProgress += colorSpeed;
            if (cycleProgress >= 1) {
                cycleProgress -= 1;
                currentColorIndex = nextColorIndex;
                do {
                    nextColorIndex = Math.floor(Math.random() * bgColors.length);
                } while (nextColorIndex === currentColorIndex);
            }
            drawBackground();
            drawCenterStar();
            drawNebula(width * 0.24, height * 0.28, width * 0.28, 'rgba(120, 80, 255, 0.16)');
            drawNebula(width * 0.72, height * 0.34, width * 0.22, 'rgba(35, 180, 255, 0.14)');
            drawNebula(width * 0.55, height * 0.76, width * 0.3, 'rgba(255, 95, 190, 0.12)');
            drawStars();
            if (dirt && noiseCanvas) {
                ctx.globalAlpha = 0.14;
                ctx.drawImage(noiseCanvas, 0, 0);
                ctx.globalAlpha = 1;
            }
            requestAnimationFrame(animate);
        }

        window.addEventListener('resize', resizeCanvas);
        resizeCanvas();
        animate();
    </script>
</body>
</html>