Drag Rotate Zoom

<!--
  示例：拖拽旋转缩放
  要点：DragRotateAndZoom 配合 shiftKeyOnly，关闭默认旋转避免手势冲突
  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>拖拽旋转缩放</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}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>按住 Shift 拖拽地图</span>
  <span id="angle">旋转 0.0°</span>
  <button id="reset">角度归零</button>
</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 view = new ol.View({
    center: ol.proj.fromLonLat([116.3974, 39.9093]),
    zoom: 13,
    rotation: 0
  });

  var dragRotate = new ol.interaction.DragRotateAndZoom({
    condition: ol.events.condition.shiftKeyOnly
  });

  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,
    /* 默认旋转手势全部关闭，只保留自建的这个 */
    interactions: ol.interaction.defaults.defaults({
      altShiftDragRotate: false,
      pinchRotate: false
    }).extend([dragRotate]),
    controls: ol.control.defaults.defaults({ attribution: false })
  });

  var angle = document.getElementById('angle');

  function report() {
    var deg = view.getRotation() * 180 / Math.PI;
    /* 归一到 -180 ~ 180，读数更直观 */
    deg = ((deg + 180) % 360 + 360) % 360 - 180;
    angle.textContent = '旋转 ' + deg.toFixed(1) + '°';
  }

  view.on('change:rotation', report);

  document.getElementById('reset').addEventListener('click', function () {
    view.animate({ rotation: 0, duration: 400 });
  });

  report();
})();
</script>
</body>
</html>