How to Implement Taxi Trajectory Display with PHP and Baidu Maps API
This tutorial demonstrates how to build a taxi trajectory visualization by creating a MySQL table for track data, inserting sample records, writing a PHP script to serve the data as JSON, and using Baidu Maps JavaScript API in an HTML page to render the moving paths.
<div id="map"></div> <script src="http://api.map.baidu.com/api?v=2.0&ak=your_api_key"></script> <script> var map = new BMap.Map("map"); map.centerAndZoom(new BMap.Point(116.404, 39.915), 14); // Get trajectory data var carId = 1; var xhr = new XMLHttpRequest(); xhr.open("GET", "map.php?car_id=" + carId, true); xhr.onreadystatechange = function () { if (xhr.readyState === 4 && xhr.status === 200) { var tracks = JSON.parse(xhr.responseText); var path = tracks.map(function (track) { return new BMap.Point(track.lng, track.lat); }); var polyline = new BMap.Polyline(path, {strokeColor:"blue", strokeWeight:3, strokeOpacity:0.5}); map.addOverlay(polyline); } }; xhr.send(); </script> </body> </html>
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