CODERS-AGI/astro.html at main · Loopshape/CODERS-AGI · GitHub

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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>AstroView :: Real-Time Constellation Viewer v1.0</title>
    <!-- Tailwind CSS for surrounding UI/Aesthetics -->
    <script src="https://cdn.tailwindcss.com"></script>
    <link href="https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap" rel="stylesheet">
    <style>
        html, body {
            margin: 0;
            height: 100%;
            background: #0d1117;
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: 'Space Mono', monospace;
            overflow: hidden;
        }
        canvas {
            display: block;
            background: #000000;
        }
        #controls-box {
            background-color: rgba(0, 0, 0, 0.7);
            border: 1px solid #4f46e5;
            box-shadow: 0 0 10px rgba(79, 70, 229, 0.5);
        }
    </style>
</head>
<body>
    <div class="absolute inset-0 flex flex-col items-center justify-center p-4">
        <canvas id="sky-canvas"></canvas>

        <div id="controls-box" class="absolute top-4 right-4 p-3 rounded-lg text-xs text-indigo-300 select-none">
            <p class="text-base font-bold text-center mb-1">CELESTIAL SPHERE</p>
            <p><strong>Drag/Swipe:</strong> Look Around (Pan)</p>
            <p><strong>Auto-Rotation:</strong> Eastward Drift</p>
        </div>

        <div id="info-box" class="absolute bottom-4 left-4 p-3 rounded-lg text-xs text-gray-200 bg-gray-900 border border-gray-700 font-mono">
            <p>Viewing Direction (RA/Dec):</p>
            <p><span class="text-yellow-400">RA:</span> <strong id="ra-display">0.00°</strong></p>
            <p><span class="text-cyan-400">Dec:</span> <strong id="dec-display">0.00°</strong></p>
        </div>
    </div>

    <script>
        const canvas = document.getElementById("sky-canvas");
        const ctx = canvas.getContext("2d");
        const raDisplay = document.getElementById('ra-display');
        const decDisplay = document.getElementById('dec-display');

        // --- Configuration ---
        const Z_SCALE = 2; // Simulated Sphere Radius
        const FOV = 2.0;   // Field of View factor (controls perspective)
        const DRAG_SENSITIVITY = 0.005;

        // Current view angles (in radians)
        let viewerRA = 0; // Right Ascension (Horizontal look)
        let viewerDec = 0; // Declination (Vertical look)

        // --- Data Model: Simplified Constellation Data ---
        // Coordinates are (Right Ascension, Declination) in degrees
        const CONSTELLATION_DATA = {
            stars: [
                // Ursa Major (Big Dipper - High Declination)
                { ra: 165, dec: 62, name: 'Dubhe', size: 5, color: '#FFFFFF' },
                { ra: 180, dec: 60, name: 'Merak', size: 4, color: '#EEDDFF' },
                { ra: 185, dec: 58, name: 'Phecda', size: 3, color: '#FFFFFF' },
                { ra: 210, dec: 50, name: 'Alioth', size: 5, color: '#FFFFFF' },
                { ra: 230, dec: 40, name: 'Alkaid', size: 3, color: '#EEDDFF' },
                // Orion (Equatorial)
                { ra: 70, dec: 8, name: 'Betelgeuse', size: 6, color: '#FF9999' }, // Red Giant
                { ra: 85, dec: -10, name: 'Rigel', size: 6, color: '#AAEEFF' },   // Blue Giant
                { ra: 80, dec: 0, name: 'Alnilam', size: 5, color: '#FFFFFF' },
                { ra: 80, dec: -1, name: 'Alnitak', size: 5, color: '#FFFFFF' },
                { ra: 80, dec: 1, name: 'Mintaka', size: 5, color: '#FFFFFF' },
            ],
            // Lines define connections between star indices
            lines: [
                // Ursa Major (0-4, 5-6, etc.) - indices based on definition above
                [0, 1], [1, 2], [2, 3], [3, 4], // Dipper handle and cup
                // Orion (Major connections)
                [5, 6], [5, 8], [6, 8], // Body outline
                [7, 8], [8, 9] // The belt stars
            ]
        };

        // --- Math Utilities ---

        function toRadians(degrees) {
            return degrees * Math.PI / 180;
        }

        function toDegrees(radians) {
            return radians * 180 / Math.PI;
        }

        function normalizeAngle(angle) {
            return (angle % (Math.PI * 2) + Math.PI * 2) % (Math.PI * 2);
        }

        /**
         * Converts celestial (RA, Dec) coordinates to 3D Cartesian (x, y, z) on a unit sphere.
         * The sphere is centered at (0, 0, 0).
         * @param {number} ra - Right Ascension in radians (longitude)
         * @param {number} dec - Declination in radians (latitude)
         * @returns {{x: number, y: number, z: number}}
         */
        function raDecToCartesian(ra, dec) {
            const cosDec = Math.cos(dec);
            return {
                x: Z_SCALE * cosDec * Math.cos(ra),
                y: Z_SCALE * Math.sin(dec),
                z: Z_SCALE * cosDec * Math.sin(ra)
            };
        }

        /**
         * Rotates a point (x, y, z) by viewer's RA and Dec angles.
         * This transforms the absolute star coordinates into the viewer's relative frame.
         * @param {{x: number, y: number, z: number}} p - Cartesian point
         * @returns {{x: number, y: number, z: number}} - Rotated point
         */
        function rotateCartesian(p) {
            const pitch = viewerDec; // Rotation around X axis
            const yaw = viewerRA;    // Rotation around Y axis

            let x = p.x;
            let y = p.y;
            let z = p.z;

            // 1. Rotation around Y (Yaw) - Horizontal
            let cosY = Math.cos(yaw);
            let sinY = Math.sin(yaw);
            let tempX = x * cosY + z * sinY;
            let tempZ = z * cosY - x * sinY;
            x = tempX;
            z = tempZ;

            // 2. Rotation around X (Pitch) - Vertical
            let cosP = Math.cos(pitch);
            let sinP = Math.sin(pitch);
            let tempY = y * cosP - z * sinP;
            tempZ = z * cosP + y * sinP;
            y = tempY;
            z = tempZ;

            return { x, y, z };
        }

        /**
         * Projects the rotated 3D point onto the 2D canvas using perspective.
         * @param {{x: number, y: number, z: number}} rotatedP - Rotated Cartesian point
         * @returns {{x: number, y: number, size: number}} - Projected 2D point
         */
        function projectToCanvas(rotatedP) {
            // Check if star is behind the camera (z must be positive after rotation)
            if (rotatedP.z <= 0) return null;

            // Perspective projection
            const scale = FOV / rotatedP.z;
            const x2D = rotatedP.x * scale + canvas.width / 2;
            const y2D = rotatedP.y * scale + canvas.height / 2;

            // Size also scales with distance (closer = bigger)
            const sizeScale = 1 / rotatedP.z;

            return { x: x2D, y: y2D, sizeScale: sizeScale };
        }


        // --- Drawing Functions ---

        function drawStar(star, projected) {
            if (!projected) return;

            const size = star.size * projected.sizeScale * 0.5;

            ctx.beginPath();
            ctx.arc(projected.x, projected.y, size, 0, Math.PI * 2);

            // Add soft glow for a celestial look
            ctx.shadowBlur = size * 3;
            ctx.shadowColor = star.color;

            ctx.fillStyle = star.color;
            ctx.fill();

            ctx.shadowBlur = 0; // Reset shadow for next object

            // Optionally draw star name if large enough and centered
            // if (size > 2) {
            //     ctx.fillStyle = star.color;
            //     ctx.font = '10px Space Mono';
            //     ctx.textAlign = 'center';
            //     ctx.fillText(star.name, projected.x, projected.y - 10);
            // }
        }

        function drawConstellationLines(projectedStars) {
            ctx.strokeStyle = '#374151'; // Slate gray lines
            ctx.lineWidth = 1.5;

            CONSTELLATION_DATA.lines.forEach(([i, j]) => {
                const start = projectedStars[i];
                const end = projectedStars[j];

                // Only draw line if both stars are in view (not null)
                if (start && end) {
                    ctx.beginPath();
                    ctx.moveTo(start.x, start.y);
                    ctx.lineTo(end.x, end.y);
                    ctx.stroke();
                }
            });
        }

        function draw() {
            // 1. Clear Canvas (fade effect for smoothness)
            ctx.fillStyle = 'rgba(0, 0, 0, 0.8)';
            ctx.fillRect(0, 0, canvas.width, canvas.height);

            // 2. Automatic Rotation (Simulate Earth's rotation/time passing)
            viewerRA += 0.0005; // Gentle eastward drift

            // 3. Project and Draw
            const projectedStars = [];

            // Store the projection for lines
            CONSTELLATION_DATA.stars.forEach((star, index) => {
                const raRad = toRadians(star.ra);
                const decRad = toRadians(star.dec);

                // 3D Cartesian
                let p = raDecToCartesian(raRad, decRad);

                // Rotation
                let rotatedP = rotateCartesian(p);

                // 2D Projection
                let projected = projectToCanvas(rotatedP);

                projectedStars[index] = projected;
            });

            // Draw lines first so stars sit on top
            drawConstellationLines(projectedStars);

            // Draw stars second
            projectedStars.forEach((projected, index) => {
                drawStar(CONSTELLATION_DATA.stars[index], projected);
            });

            // Update Info Panel
            raDisplay.textContent = `${(toDegrees(normalizeAngle(viewerRA))).toFixed(2)}°`;
            decDisplay.textContent = `${toDegrees(viewerDec).toFixed(2)}°`;

            requestAnimationFrame(draw);
        }

        // --- Initialization and Resize ---

        function resizeCanvas() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
            // Ensure the canvas maintains aspect ratio while filling screen
            const size = Math.min(window.innerWidth, window.innerHeight) * 0.95;
            canvas.width = size;
            canvas.height = size;
        }
        window.addEventListener("resize", resizeCanvas);
        resizeCanvas();

        // --- Movement and Controls (Touch/Click Drag) ---
        let isDragging = false;
        let previousMousePosition = { x: 0, y: 0 };

        function toVector2(e) {
            const rect = canvas.getBoundingClientRect();
            const clientX = e.clientX !== undefined ? e.clientX : e.touches?.[0]?.clientX;
            const clientY = e.clientY !== undefined ? e.clientY : e.touches?.[0]?.clientY;
            return { x: clientX - rect.left, y: clientY - rect.top };
        }

        function onPointerDown(e) {
            isDragging = true;
            previousMousePosition = toVector2(e);
            e.preventDefault();
        }

        function onPointerMove(e) {
            if (!isDragging) return;

            const currentPosition = toVector2(e);
            const deltaX = currentPosition.x - previousMousePosition.x;
            const deltaY = currentPosition.y - previousMousePosition.y;

            // Update Viewer RA/Dec angles
            // Horizontal movement (X) affects viewerRA (Yaw)
            viewerRA -= deltaX * DRAG_SENSITIVITY;
            // Vertical movement (Y) affects viewerDec (Pitch)
            viewerDec += deltaY * DRAG_SENSITIVITY;

            // Clamp vertical rotation (Declination) to prevent flipping the sky
            viewerDec = Math.max(-Math.PI / 2, Math.min(Math.PI / 2, viewerDec));

            previousMousePosition = currentPosition;
            e.preventDefault();
        }

        function onPointerUp() {
            isDragging = false;
        }

        // Attach integrated pointer event handlers
        canvas.addEventListener('mousedown', onPointerDown, false);
        document.addEventListener('mouseup', onPointerUp, false);
        document.addEventListener('mousemove', onPointerMove, false);

        canvas.addEventListener('touchstart', onPointerDown, false);
        document.addEventListener('touchend', onPointerUp, false);
        document.addEventListener('touchmove', onPointerMove, { passive: false });

        // Start the simulation
        requestAnimationFrame(draw);
    </script>
</body>
</html>