Fly to

<!--
  示例：飞行动画
  核心逻辑：按钮触发 flyTo，带俯仰与旋转，动画结束后回读视角
  依赖：MapLibre GL JS 4 · jsDelivr CDN · demotiles 免 Key 样式
-->
<!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>飞行动画</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/maplibre-gl@4/dist/maplibre-gl.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;color:#16181d}
  .bar{flex:0 0 auto;display:flex;gap:8px;align-items:center;padding:8px 12px;
       background:#f6f7f9;border-bottom:1px solid #e3e6ea;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar button{font:inherit;font-size:12px;padding:4px 10px;border-radius:4px;cursor:pointer;
       border:1px solid #ccd1d9;background:#fff;color:#16181d}
  .bar button:hover{background:#eef0f3}
  .bar b{color:#16181d;font-weight:600}
  #map{flex:1 1 auto;min-height:0}
</style>
</head>
<body>
<div class="bar">
  <button data-city="beijing">北京</button>
  <button data-city="shanghai">上海</button>
  <button data-city="newyork">纽约</button>
  <button data-city="capetown">开普敦</button>
  <button data-city="sydney">悉尼</button>
  <span>当前 <b id="cur">—</b></span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/maplibre-gl@4/dist/maplibre-gl.js"></script>
<script>
(function () {
  'use strict';

  if (typeof maplibregl === 'undefined') {
    document.body.innerHTML =
      '<div style="padding:24px;color:#b42318">MapLibre 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var places = {
    beijing: { name: '北京', center: [116.391, 39.907], zoom: 4, pitch: 40, bearing: -18 },
    shanghai: { name: '上海', center: [121.474, 31.230], zoom: 4, pitch: 45, bearing: 24 },
    newyork: { name: '纽约', center: [-74.006, 40.713], zoom: 3.6, pitch: 35, bearing: -32 },
    capetown: { name: '开普敦', center: [18.424, -33.925], zoom: 3.8, pitch: 42, bearing: 12 },
    sydney: { name: '悉尼', center: [151.209, -33.868], zoom: 3.4, pitch: 30, bearing: 40 }
  };

  var map = new maplibregl.Map({
    container: 'map',
    style: 'https://demotiles.maplibre.org/style.json',
    center: [104, 34],
    zoom: 2.6,
    maxPitch: 70,
    attributionControl: {
      compact: true,
      customAttribution: 'MapLibre demo tiles'
    }
  });

  function fly(key) {
    var p = places[key];
    map.flyTo({
      center: p.center,
      zoom: p.zoom,
      pitch: p.pitch,
      bearing: p.bearing,
      speed: 0.9,
      curve: 1.4,
      duration: 2600,
      essential: true
    });
    document.getElementById('cur').textContent = p.name + '（飞行中）';
  }

  document.querySelectorAll('[data-city]').forEach(function (btn) {
    btn.addEventListener('click', function () {
      fly(this.getAttribute('data-city'));
    });
  });

  map.on('moveend', function () {
    var c = map.getCenter();
    document.getElementById('cur').textContent =
      c.lng.toFixed(2) + ', ' + c.lat.toFixed(2) +
      ' · z' + map.getZoom().toFixed(1) +
      ' · ' + map.getPitch().toFixed(0) + '°';
  });

  map.addControl(new maplibregl.NavigationControl({ visualizePitch: true }), 'top-right');
})();
</script>
</body>
</html>