Pan Animation

<!--
  示例：平移动画
  要点：view.animate 组合 center / zoom / duration / easing，可 cancelAnimations 中断
  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>平移动画</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:10px;align-items:center;font-size:12px;color:#58606e}
  .bar button{padding:4px 10px;border:1px solid #cfd4dc;border-radius:4px;
              background:#fff;cursor:pointer;font-size:12px}
  .bar label{display:flex;gap:5px;align-items:center;cursor:pointer}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <button data-city="beijing">北京</button>
  <button data-city="shanghai">上海</button>
  <button data-city="guangzhou">广州</button>
  <label><input type="checkbox" id="withZoom"> 同时缩放</label>
  <button id="stop">中断动画</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 cities = {
    beijing: { lon: 116.3974, lat: 39.9093, name: '北京' },
    shanghai: { lon: 121.4737, lat: 31.2304, name: '上海' },
    guangzhou: { lon: 113.2644, lat: 23.1291, name: '广州' }
  };

  var view = new ol.View({
    center: ol.proj.fromLonLat([116.3974, 39.9093]),
    zoom: 10
  });

  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'}) })],
    view: view,
    controls: ol.control.defaults.defaults({ attribution: false })
  });

  var info = document.getElementById('info');
  var withZoom = document.getElementById('withZoom');

  function flyTo(city) {
    var target = ol.proj.fromLonLat([city.lon, city.lat]);
    var opts = {
      center: target,
      duration: 900,
      easing: ol.easing.inAndOut
    };
    if (withZoom.checked) {
      opts.zoom = 12;
    }
    view.animate(opts);
    info.textContent = '正在前往' + city.name;
  }

  Array.prototype.forEach.call(document.querySelectorAll('[data-city]'), function (btn) {
    btn.addEventListener('click', function () {
      flyTo(cities[btn.dataset.city]);
    });
  });

  document.getElementById('stop').addEventListener('click', function () {
    view.cancelAnimations();
    info.textContent = '动画已中断';
  });
})();
</script>
</body>
</html>