Geolocation Orientation

<!--
  说明：定位与朝向
  核心逻辑：ol.Geolocation 取当前位置与精度，getHeading 驱动箭头旋转
  依赖：OpenLayers 10.3.1 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>定位与朝向</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@10.3.1/ol.css">
<style>
  html,body{height:100%;margin:0}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  .bar{flex:0 0 auto;padding:8px 12px;background:#f6f7f9;border-bottom:1px solid #e3e6ea;
       display:flex;gap:8px;align-items:center;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar button{font:inherit;padding:4px 10px;border:1px solid #c9d0da;border-radius:5px;
              background:#fff;color:#1f2a37;cursor:pointer}
  #info{margin-left:auto}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <button id="track">开启定位</button>
  <button data-h="0">模拟 0°</button>
  <button data-h="90">模拟 90°</button>
  <span id="info">—</span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/ol@10.3.1/dist/ol.js"></script>
<script>
(function () {
  'use strict';

  if (typeof ol === 'undefined') {
    document.getElementById('map').innerHTML =
      '<div style="padding:20px;color:#b42318">OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var fromLonLat = ol.proj.fromLonLat;
  var heading = 0;

  var marker = new ol.Feature({ geometry: new ol.geom.Point(fromLonLat([116.391, 39.907])) });
  var accuracy = new ol.Feature({ geometry: new ol.geom.Point(fromLonLat([116.391, 39.907])) });

  var layer = new ol.layer.Vector({
    source: new ol.source.Vector({ features: [accuracy, marker] }),
    style: function (feature) {
      if (feature === accuracy) {
        return new ol.style.Style({
          image: new ol.style.Circle({
            radius: 22,
            fill: new ol.style.Fill({ color: 'rgba(31,95,208,0.16)' }),
            stroke: new ol.style.Stroke({ color: 'rgba(31,95,208,0.55)', width: 1.5 })
          })
        });
      }
      return new ol.style.Style({
        image: new ol.style.RegularShape({
          points: 3,
          radius: 10,
          rotation: heading * Math.PI / 180,
          fill: new ol.style.Fill({ color: '#1f5fd0' }),
          stroke: new ol.style.Stroke({ color: '#ffffff', width: 2 })
        })
      });
    }
  });

  var view = new ol.View({ center: fromLonLat([116.391, 39.907]), zoom: 14, minZoom: 2, maxZoom: 19 });

  var map = new ol.Map({
    target: 'map',
    layers: [new ol.layer.Tile({ source: new ol.source.XYZ({url: 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}', attributions: 'Tiles © Esri'}) }), layer],
    view: view,
    controls: ol.control.defaults.defaults({ attribution: false, rotate: false })
  });

  var info = document.getElementById('info');
  var geo = new ol.Geolocation({ projection: 'EPSG:3857', tracking: false, trackingOptions: { enableHighAccuracy: true } });

  geo.on('change:position', function () {
    var pos = geo.getPosition();
    if (!pos) return;
    marker.getGeometry().setCoordinates(pos);
    accuracy.getGeometry().setCoordinates(pos);
    layer.changed();
    view.animate({ center: pos, zoom: 15, duration: 500 });
    var ll = ol.proj.toLonLat(pos);
    info.textContent = '位置 ' + ll[0].toFixed(5) + ', ' + ll[1].toFixed(5) +
      ' · 精度 ' + Math.round(geo.getAccuracy() || 0) + ' m';
  });

  geo.on('change:heading', function () {
    var h = geo.getHeading();
    if (typeof h === 'number') {
      heading = h;
      layer.changed();
      info.textContent = '朝向 ' + Math.round(h) + '°（设备）';
    }
  });

  geo.on('error', function (e) {
    info.textContent = '定位失败：' + (e.message || '浏览器拒绝或环境不支持');
  });

  document.getElementById('track').addEventListener('click', function () {
    geo.setTracking(true);
    info.textContent = '正在请求定位授权…';
  });

  Array.prototype.forEach.call(document.querySelectorAll('.bar button[data-h]'), function (btn) {
    btn.addEventListener('click', function () {
      heading = Number(btn.getAttribute('data-h'));
      layer.changed();
      info.textContent = '模拟朝向 ' + heading + '°';
    });
  });

  info.textContent = '尚未定位';
})();
</script>
</body>
</html>