speedometer/index.html at main · stibinottathai/speedometer · 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>GPS Speedometer</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Orbitron:wght@400..900&display=swap" rel="stylesheet">
    <style>
        /* Custom styles for the speedometer */
        body {
            font-family: 'Orbitron', sans-serif;
            touch-action: manipulation; /* Prevents double-tap zoom on mobile */
        }
        .speed-display {
            text-shadow: 0 0 10px rgba(52, 211, 153, 0.5), 0 0 20px rgba(52, 211, 153, 0.5);
        }
        .unit-display {
            text-shadow: 0 0 5px rgba(52, 211, 153, 0.4);
        }
        /* Custom styles for active/inactive buttons */
        .unit-btn.active {
            background-color: #10B981; /* emerald-500 */
            color: #052e16; /* dark green */
            box-shadow: 0 0 15px rgba(16, 185, 129, 0.6);
        }
        .unit-btn.inactive {
            background-color: #374151; /* gray-700 */
            color: #D1D5DB; /* gray-300 */
        }
    </style>
</head>
<body class="bg-gray-900 text-white flex items-center justify-center min-h-screen">

    <div id="app" class="w-full max-w-md mx-auto p-4 sm:p-6 md:p-8 text-center bg-gray-800 rounded-3xl shadow-2xl border-2 border-gray-700">

        <!-- App Title -->
        <h1 class="text-2xl sm:text-3xl font-bold text-gray-300 mb-6">GPS Speedometer</h1>

        <!-- Speedometer Display -->
        <div class="relative w-72 h-72 sm:w-80 sm:h-80 mx-auto bg-gray-900 rounded-full flex flex-col items-center justify-center p-4 border-8 border-gray-700 shadow-inner">
            <div id="speed" class="speed-display text-7xl sm:text-8xl font-black text-emerald-400">---</div>
            <div id="unit" class="unit-display text-2xl sm:text-3xl font-bold text-emerald-300 mt-2">km/h</div>
        </div>

        <!-- Unit Selection Controls -->
        <div class="mt-8 flex justify-center space-x-4">
            <button id="kphBtn" class="unit-btn active text-lg font-semibold py-3 px-8 rounded-full transition-all duration-300 ease-in-out transform hover:scale-105">
                KM/H
            </button>
            <button id="mphBtn" class="unit-btn inactive text-lg font-semibold py-3 px-8 rounded-full transition-all duration-300 ease-in-out transform hover:scale-105">
                MPH
            </button>
        </div>

        <!-- Status and Accuracy Information -->
        <div class="mt-6 text-gray-400">
            <p id="status">Requesting location access...</p>
            <p id="accuracy" class="text-sm mt-2"></p>
        </div>

    </div>

    <script>
        // DOM element references
        const speedElement = document.getElementById('speed');
        const unitElement = document.getElementById('unit');
        const statusElement = document.getElementById('status');
        const accuracyElement = document.getElementById('accuracy');
        const kphBtn = document.getElementById('kphBtn');
        const mphBtn = document.getElementById('mphBtn');

        // Application state
        let currentUnit = 'kph'; // 'kph' or 'mph'
        let lastSpeedMps = 0; // Last speed received in meters per second

        // --- Event Listeners ---
        kphBtn.addEventListener('click', () => setUnit('kph'));
        mphBtn.addEventListener('click', () => setUnit('mph'));

        /**
         * Sets the speed unit and updates the UI accordingly.
         * @param {string} unit - The unit to switch to ('kph' or 'mph').
         */
        function setUnit(unit) {
            currentUnit = unit;
            unitElement.textContent = unit === 'kph' ? 'km/h' : 'mph';

            // Update button styles
            kphBtn.classList.toggle('active', unit === 'kph');
            kphBtn.classList.toggle('inactive', unit !== 'kph');
            mphBtn.classList.toggle('active', unit === 'mph');
            mphBtn.classList.toggle('inactive', unit !== 'mph');

            // Recalculate and display speed with the new unit
            updateSpeedDisplay(lastSpeedMps);
        }

        /**
         * Converts speed from m/s and updates the display.
         * @param {number | null} speedMps - Speed in meters per second.
         */
        function updateSpeedDisplay(speedMps) {
            if (speedMps === null || isNaN(speedMps)) {
                speedElement.textContent = '---';
                return;
            }

            let displaySpeed = 0;
            if (currentUnit === 'kph') {
                // Convert m/s to km/h (1 m/s = 3.6 km/h)
                displaySpeed = speedMps * 3.6;
            } else {
                // Convert m/s to mph (1 m/s = 2.23694 mph)
                displaySpeed = speedMps * 2.23694;
            }

            // Display speed rounded to the nearest integer
            speedElement.textContent = Math.round(displaySpeed);
        }

        /**
         * Success callback for the Geolocation API.
         * @param {GeolocationPosition} position - The position object from the API.
         */
        function onLocationUpdate(position) {
            statusElement.textContent = 'GPS signal acquired.';
            const coords = position.coords;

            // The speed property is in meters per second.
            lastSpeedMps = coords.speed === null ? 0 : coords.speed;
            updateSpeedDisplay(lastSpeedMps);

            // Display accuracy if available
            if (coords.accuracy) {
                accuracyElement.textContent = `Accuracy: ${coords.accuracy.toFixed(1)} meters`;
            }
        }

        /**
         * Error callback for the Geolocation API.
         * @param {GeolocationPositionError} error - The error object from the API.
         */
        function onLocationError(error) {
            console.error('Geolocation error:', error.message);
            switch (error.code) {
                case error.PERMISSION_DENIED:
                    statusElement.textContent = "Location access denied.";
                    break;
                case error.POSITION_UNAVAILABLE:
                    statusElement.textContent = "Location information is unavailable.";
                    break;
                case error.TIMEOUT:
                    statusElement.textContent = "The request to get user location timed out.";
                    break;
                default:
                    statusElement.textContent = "An unknown error occurred.";
                    break;
            }
            speedElement.textContent = 'ERR';
            accuracyElement.textContent = '';
        }

        // --- Main execution ---
        // Check if Geolocation is supported by the browser
        if ('geolocation' in navigator) {
            statusElement.textContent = "Waiting for GPS signal...";

            // Options for the geolocation watch
            const geoOptions = {
                enableHighAccuracy: true, // Request the most accurate position
                maximumAge: 0, // Don't use a cached position
                timeout: 27000 // Time in ms before the error callback is invoked
            };

            // Start watching the user's position
            navigator.geolocation.watchPosition(onLocationUpdate, onLocationError, geoOptions);

        } else {
            statusElement.textContent = "Geolocation is not supported by your browser.";
            speedElement.textContent = 'N/A';
        }
    </script>
</body>
</html>