Translate Features

<!--
  示例：OpenLayers 平移要素
  要点：Select 与 Translate 组合，点击选中面后拖动整块要素并更新其几何
  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>平移要素</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;flex-wrap:wrap;font-size:12px;color:#58606e}
  .bar label{display:flex;gap:5px;align-items:center;cursor:pointer}
  .bar select,.bar input[type=range]{font-size:12px}
  .bar .val{font-family:ui-monospace,Consolas,monospace;color:#1f5fd0;min-width:44px}
  .bar .sep{width:1px;height:16px;background:#d8dce2}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>点击选中，按住拖动</span>
  <span class="sep"></span>
  <span id="info">未选中要素</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').textContent = 'OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net';
    return;
  }


  var regions = [
    {name: '西城', box: [116.32, 39.88, 116.40, 39.96], color: '#efcf9f'},
    {name: '东城', box: [116.40, 39.88, 116.48, 39.96], color: '#e8aabf'},
    {name: '朝阳', box: [116.48, 39.90, 116.60, 40.02], color: '#b7dbb2'}
  ];

  var features = regions.map(function (region) {
    var b = region.box;
    return new ol.Feature({
      geometry: new ol.geom.Polygon([[
        ol.proj.fromLonLat([b[0], b[1]]),
        ol.proj.fromLonLat([b[2], b[1]]),
        ol.proj.fromLonLat([b[2], b[3]]),
        ol.proj.fromLonLat([b[0], b[3]]),
        ol.proj.fromLonLat([b[0], b[1]])
      ]]),
      name: region.name,
      color: region.color
    });
  });

  var vector = new ol.layer.Vector({
    source: new ol.source.Vector({features: features}),
    style: function (feature) {
      return new ol.style.Style({
        fill: new ol.style.Fill({color: feature.get('color')}),
        stroke: new ol.style.Stroke({color: '#4d5b69', width: 1}),
        text: new ol.style.Text({
          text: feature.get('name'),
          font: '500 12px sans-serif',
          fill: new ol.style.Fill({color: '#23303c'}),
          stroke: new ol.style.Stroke({color: '#fff', width: 3})
        })
      });
    }
  });

  var select = new ol.interaction.Select({
    style: new ol.style.Style({
      fill: new ol.style.Fill({color: 'rgba(31, 95, 208, 0.18)'}),
      stroke: new ol.style.Stroke({color: '#1f5fd0', width: 2})
    })
  });

  var translate = new ol.interaction.Translate({
    features: select.getFeatures()
  });

  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'}), opacity: 0.55}),
      vector
    ],
    interactions: ol.interaction.defaults.defaults().extend([select, translate]),
    view: new ol.View({
      center: ol.proj.fromLonLat([116.42, 39.95]),
      zoom: 12
    })
  });

  translate.on('translateend', function (evt) {
    var feature = evt.features.item(0);
    if (!feature) {
      return;
    }
    var center = ol.extent.getCenter(feature.getGeometry().getExtent());
    var lonlat = ol.proj.toLonLat(center);
    document.getElementById('info').textContent =
      feature.get('name') + ' 中心：' +
      lonlat[0].toFixed(4) + ', ' + lonlat[1].toFixed(4);
  });

  select.getFeatures().on('add', function (evt) {
    document.getElementById('info').textContent =
      '已选中 ' + evt.element.get('name');
  });

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