Polygon Styles

<!--
  说明：多边形与顶点样式的中文示例，数据在页面内生成，可独立运行。
  核心逻辑：style 数组 + geometry: MultiPoint(ring) 绘制顶点
  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>多边形与顶点样式</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 button{font:inherit;padding:3px 9px;border:1px solid #c9ced6;background:#fff;
       border-radius:5px;cursor:pointer;color:#333}
  .bar button:hover{background:#eef2f8}
  .bar input[type=range]{width:110px;vertical-align:middle}
  .bar input[type=text]{font:inherit;padding:2px 6px;border:1px solid #c9ced6;border-radius:4px}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3;position:relative}
  .panel{flex:0 0 auto;max-height:34%;overflow:auto;padding:8px 12px;font-size:12px;
       background:#fff;border-top:1px solid #e3e6ea;color:#3d4451}
  .panel pre{margin:0;font-family:Consolas,"Courier New",monospace;font-size:11px;
       white-space:pre-wrap;word-break:break-all;line-height:1.5}
  .ol-attribution{font-size:11px}

</style>
</head>
<body>
<div class="bar">
<label><input type="checkbox" id="verts" checked> 显示顶点</label>
<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') {
    var errBox = document.getElementById('map');
    if (errBox) {
      errBox.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 fromLonLat = ol.proj.fromLonLat;
  var ring = [
    [116.28, 39.86], [116.36, 39.82], [116.48, 39.86], [116.50, 39.96],
    [116.42, 40.02], [116.30, 39.98], [116.28, 39.86]
  ].map(function (c) { return fromLonLat(c); });

  var polygon = new ol.Feature({geometry: new ol.geom.Polygon([ring]), name: '示例多边形'});

  var showVerts = true;

  var layer = new ol.layer.Vector({
    source: new ol.source.Vector({features: [polygon]}),
    style: function (feature) {
      var coords = feature.getGeometry().getCoordinates()[0];
      var styles = [
        new ol.style.Style({
          fill: new ol.style.Fill({color: 'rgba(31,95,208,0.16)'}),
          stroke: new ol.style.Stroke({color: '#1f5fd0', width: 2})
        })
      ];

      if (showVerts) {
        styles.push(new ol.style.Style({
          geometry: new ol.geom.MultiPoint(coords),
          image: new ol.style.Circle({
            radius: 4,
            fill: new ol.style.Fill({color: '#ffffff'}),
            stroke: new ol.style.Stroke({color: '#1f5fd0', width: 2})
          })
        }));
      }

      styles.push(new ol.style.Style({
        text: new ol.style.Text({
          text: feature.get('name'),
          font: '500 12px sans-serif',
          fill: new ol.style.Fill({color: '#1f5fd0'}),
          stroke: new ol.style.Stroke({color: '#ffffff', width: 3})
        })
      }));

      return styles;
    }
  });

  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'})}), layer],
    view: new ol.View({center: fromLonLat([116.39, 39.92]), zoom: 12}),
    controls: ol.control.defaults.defaults({attribution: false, zoom: true, rotate: false})
  });

  var info = document.getElementById('info');
  info.textContent = '顶点 ' + ring.length + ' 个 · 含重复的首尾点';

  document.getElementById('verts').addEventListener('change', function () {
    showVerts = this.checked;
    layer.changed();
    info.textContent = showVerts
      ? '顶点已显示，由 MultiPoint 样式渲染'
      : '顶点已隐藏，仅保留面填充与描边';
  });
})();
</script>
</body>
</html>