Arcgis Tiled

<!--
  示例：ArcGIS REST 瓦片图层
  要点：自定义 tileGrid 分辨率阶梯 + tileUrlFunction 按 z/x/y 取瓦片
  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>ArcGIS REST 瓦片图层</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;color:#16181d}
  .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 b{color:#16181d;font-weight:600}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>瓦片坐标：<b id="tile">—</b></span>
  <span>当前缩放：<b id="zoom">—</b></span>
  <span>瓦片网格 256px / 19 级</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 (!window.ol) {
    document.getElementById('map').textContent = 'OpenLayers 加载失败，请检查 cdn.jsdelivr.net 是否可访问';
    return;
  }

  /* 页面内生成瓦片：按 z/x/y 画出带坐标标注的方块，替代 ArcGIS REST 服务返回的图片 */
  var cache = {};

  function noise(x, y) {
    var h = (x * 73856093) ^ (y * 19349663);
    return Math.abs(h % 997) / 997;
  }

  function tileURL(z, x, y) {
    var key = z + '/' + x + '/' + y;
    if (cache[key]) return cache[key];

    var c = document.createElement('canvas');
    c.width = c.height = 256;
    var ctx = c.getContext('2d');
    var n = noise(x, y);

    ctx.fillStyle = 'rgba(31,95,208,' + (0.05 + n * 0.12).toFixed(3) + ')';
    ctx.fillRect(0, 0, 256, 256);

    ctx.strokeStyle = 'rgba(31,95,208,0.5)';
    ctx.lineWidth = 1;
    ctx.strokeRect(0.5, 0.5, 255, 255);
    for (var i = 1; i < 4; i++) {
      ctx.beginPath(); ctx.moveTo(i * 64, 0); ctx.lineTo(i * 64, 256); ctx.stroke();
      ctx.beginPath(); ctx.moveTo(0, i * 64); ctx.lineTo(256, i * 64); ctx.stroke();
    }

    ctx.fillStyle = 'rgba(15,63,143,0.9)';
    ctx.font = '600 12px sans-serif';
    ctx.fillText(z + ' / ' + x + ' / ' + y, 8, 20);

    cache[key] = c.toDataURL('image/png');
    return cache[key];
  }

  var tileGrid = ol.tilegrid.createXYZ({ tileSize: 256, maxZoom: 19 });

  /* 官方示例用 ol.source.TileArcGISRest 指向 ArcGIS 服务；
     这里用 ol.source.XYZ + tileUrlFunction，走同一套瓦片网格与加载流程 */
  var arcgisLayer = new ol.layer.Tile({
    opacity: 0.85,
    source: new ol.source.XYZ({
      tileGrid: tileGrid,
      attributions: '自造瓦片 · 结构对齐 ArcGIS REST',
      tileUrlFunction: function (tileCoord) {
        return tileURL(tileCoord[0], tileCoord[1], tileCoord[2]);
      }
    })
  });

  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'}) }), arcgisLayer],
    view: new ol.View({
      center: ol.proj.fromLonLat([116.391263, 39.907359]),
      zoom: 11,
      maxZoom: 19
    }),
    controls: ol.control.defaults.defaults({ attribution: true, rotate: false })
  });

  function report() {
    var z = Math.round(map.getView().getZoom());
    var size = map.getSize();
    var c = map.getCoordinateFromPixel([size[0] / 2, size[1] / 2]);
    var tc = tileGrid.getTileCoordForCoordAndZ(c, z);
    document.getElementById('zoom').textContent = z;
    document.getElementById('tile').textContent = tc ? tc.join(' / ') : '—';
  }

  map.on('moveend', report);
  report();
})();
</script>
</body>
</html>