Drag Rotate and Zoom

<!--
  示例：拖拽旋转并缩放 — OpenLayers drag-rotate-and-zoom
  核心逻辑：继承 ol.interaction.Pointer，按下记录分辨率与角度，拖动时横向改分辨率、纵向改旋转
  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>拖拽旋转并缩放</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;flex-wrap:wrap}
  .bar button{font:inherit;padding:3px 9px;border:1px solid #ccd2da;background:#fff;
       border-radius:3px;cursor:pointer;color:#2b3140}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>按住左键横向拖动缩放，纵向拖动旋转</span>
  <button id="reset">复位视角</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 infoEl = document.getElementById('info');
  var center = ol.proj.fromLonLat([116.391263, 39.907359]);

  var view = new ol.View({
    center: center,
    zoom: 12,
    minZoom: 2,
    maxZoom: 19,
    rotation: 0
  });

  /* 单个交互同时完成旋转与缩放 */
  var startPixel = null;
  var startResolution = 0;
  var startRotation = 0;

  var dragRotateZoom = new ol.interaction.Pointer({
    handleDownEvent: function (evt) {
      startPixel = evt.pixel;
      startResolution = evt.map.getView().getResolution();
      startRotation = evt.map.getView().getRotation();
      return true;
    },
    handleDragEvent: function (evt) {
      var v = evt.map.getView();
      var dx = evt.pixel[0] - startPixel[0];
      var dy = evt.pixel[1] - startPixel[1];

      /* 横向位移映射成 2 的指数倍缩放，向右拖放大 */
      var scale = Math.pow(2, dx / 220);
      var res = startResolution / scale;
      v.setResolution(Math.max(res, 1));
      v.setRotation(startRotation + dy / 260);

      infoEl.textContent = '缩放 ×' + scale.toFixed(2) +
        ' · 旋转 ' + (v.getRotation() * 180 / Math.PI).toFixed(0) + '°';
    },
    handleUpEvent: function () {
      return false;
    }
  });

  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'}) })
    ],
    view: view,
    interactions: ol.interaction.defaults.defaults({
      dragPan: false,
      doubleClickZoom: false,
      altShiftDragRotate: false,
      pinchRotate: false
    }),
    controls: ol.control.defaults.defaults({ attribution: false, rotate: false })
  });

  map.addInteraction(dragRotateZoom);

  document.getElementById('reset').addEventListener('click', function () {
    view.animate({ center: center, rotation: 0, zoom: 12, duration: 400 });
    infoEl.textContent = '—';
  });
})();
</script>
</body>
</html>