Drag and Drop Custom Mvt

<!--
  说明：拖放数据的瓦片预览的中文示例，数据在页面内生成，可独立运行。
  核心逻辑：DragAndDrop 载入 + getTileCoordForCoordAndZ + 瓦片范围矩形
  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>拖放数据的瓦片预览</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">
<button id="demo" type="button">载入内置数据</button>
<span id="info">拖入 GeoJSON 后查看 z9 瓦片覆盖</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 demoGeo = {
    type: 'FeatureCollection',
    features: [
      {
        type: 'Feature',
        properties: {name: '演示区域'},
        geometry: {
          type: 'Polygon',
          coordinates: [[[116.25, 39.82], [116.55, 39.82], [116.55, 40.02], [116.25, 40.02], [116.25, 39.82]]]
        }
      },
      {
        type: 'Feature',
        properties: {name: '中心点'},
        geometry: {type: 'Point', coordinates: [116.40, 39.92]}
      }
    ]
  };

  var grid = ol.tilegrid.createXYZ({maxZoom: 19});
  var dataSource = new ol.source.Vector();
  var tileSource = new ol.source.Vector();

  var dataLayer = new ol.layer.Vector({
    source: dataSource,
    style: 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})
    })
  });

  var tileLayer = new ol.layer.Vector({
    source: tileSource,
    style: function (feature) {
      return new ol.style.Style({
        stroke: new ol.style.Stroke({color: 'rgba(238,96,42,0.85)', width: 1}),
        text: new ol.style.Text({
          text: feature.get('label'),
          font: '11px monospace',
          fill: new ol.style.Fill({color: '#ee602a'}),
          stroke: new ol.style.Stroke({color: '#ffffff', width: 3})
        })
      });
    }
  });

  var drop = new ol.interaction.DragAndDrop({
    formats: [new ol.format.GeoJSON()]
  });

  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'})}), dataLayer, tileLayer],
    view: new ol.View({center: fromLonLat([116.4, 39.9]), zoom: 10}),
    controls: ol.control.defaults.defaults({attribution: false, zoom: true, rotate: false})
  });

  map.addInteraction(drop);

  var info = document.getElementById('info');
  var level = 9;

  function drawTiles() {
    tileSource.clear();
    var ext = dataSource.getExtent();
    if (!ext || !isFinite(ext[0])) { return; }

    var tl = grid.getTileCoordForCoordAndZ([ext[0], ext[3]], level);
    var br = grid.getTileCoordForCoordAndZ([ext[2], ext[1]], level);
    var count = 0;

    for (var x = tl[1]; x <= br[1] && count < 40; x++) {
      for (var y = tl[2]; y <= br[2] && count < 40; y++) {
        var f = new ol.Feature({
          geometry: ol.geom.Polygon.fromExtent(grid.getTileCoordExtent([level, x, y])),
          label: level + '/' + x + '/' + y
        });
        tileSource.addFeature(f);
        count++;
      }
    }
    info.textContent = 'z' + level + ' 覆盖 ' + count + ' 块瓦片 · 数据 ' +
      dataSource.getFeatures().length + ' 个要素';
  }

  function load(features, note) {
    dataSource.addFeatures(features);
    var ext = dataSource.getExtent();
    if (ext && isFinite(ext[0])) {
      map.getView().fit(ext, {padding: [60, 60, 60, 60], maxZoom: 12, duration: 320});
    }
    setTimeout(drawTiles, 360);
    info.textContent = note;
  }

  drop.on('addfeatures', function (evt) {
    load(evt.features, '文件 ' + evt.file.name);
  });

  document.getElementById('demo').addEventListener('click', function () {
    var feats = new ol.format.GeoJSON().readFeatures(demoGeo, {
      dataProjection: 'EPSG:4326',
      featureProjection: 'EPSG:3857'
    });
    load(feats, '内置数据');
  });
})();
</script>
</body>
</html>