Vector Tiles 4326

<!--
  示例：OpenLayers 4326 矢量瓦片
  要点：在 EPSG:4326 视图下使用自建瓦片网格，瓦片要素直接以经纬度范围生成
  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>4326 矢量瓦片</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>EPSG:4326 瓦片网格 · tileSize 512</span>
  <span class="sep"></span>
  <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').textContent = 'OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net';
    return;
  }


  var tileGrid = ol.tilegrid.createXYZ({
    extent: [-180, -90, 180, 90],
    tileSize: 512,
    maxResolution: 180 / 512,
    maxZoom: 13
  });

  var tileFormat = {
    getType: function () {
      return 'arraybuffer';
    },
    readProjection: function () {
      return 'EPSG:4326';
    },
    readFeatures: function (buffer, options) {
      var info = JSON.parse(new TextDecoder().decode(buffer));
      var extent = options.extent;
      var w = extent[2] - extent[0];
      var h = extent[3] - extent[1];

      function box(x1, y1, x2, y2) {
        return [
          [extent[0] + x1 * w, extent[1] + y1 * h],
          [extent[0] + x2 * w, extent[1] + y1 * h],
          [extent[0] + x2 * w, extent[1] + y2 * h],
          [extent[0] + x1 * w, extent[1] + y2 * h],
          [extent[0] + x1 * w, extent[1] + y1 * h]
        ];
      }

      return [
        new ol.Feature({
          geometry: new ol.geom.Polygon([box(0.12, 0.20, 0.48, 0.78)]),
          name: '经纬网区块 A',
          tile: info.z + '/' + info.x + '/' + info.y
        }),
        new ol.Feature({
          geometry: new ol.geom.Polygon([box(0.56, 0.12, 0.90, 0.66)]),
          name: '经纬网区块 B',
          tile: info.z + '/' + info.x + '/' + info.y
        })
      ];
    }
  };

  var source = new ol.source.VectorTile({
    format: tileFormat,
    projection: 'EPSG:4326',
    tileGrid: tileGrid,
    tileUrlFunction: function (tileCoord) {
      return 'data:application/json;charset=utf-8,' + encodeURIComponent(
        JSON.stringify({z: tileCoord[0], x: tileCoord[1], y: tileCoord[2]})
      );
    },
    transition: 0
  });

  var layer = new ol.layer.VectorTile({
    source: source,
    style: function (feature) {
      return new ol.style.Style({
        fill: new ol.style.Fill({color: 'rgba(46, 125, 50, 0.35)'}),
        stroke: new ol.style.Stroke({color: 'rgba(255, 255, 255, 0.85)', width: 1}),
        text: new ol.style.Text({
          text: feature.get('name'),
          font: '500 12px sans-serif',
          fill: new ol.style.Fill({color: '#15341a'}),
          stroke: new ol.style.Stroke({color: '#ffffff', width: 3})
        })
      });
    }
  });

  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: 0.45}),
      layer
    ],
    view: new ol.View({
      projection: 'EPSG:4326',
      center: ol.proj.fromLonLat([116.391, 39.907], 'EPSG:4326'),
      zoom: 4
    })
  });

  map.on('pointermove', function (evt) {
    if (evt.dragging) {
      return;
    }
    var features = map.getFeaturesAtPixel(evt.pixel);
    document.getElementById('info').textContent = features.length
      ? features[0].get('name') + ' · 瓦片 ' + features[0].get('tile')
      : '—';
  });

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