Boilerplate

<!--
  示例：deck.gl 最小骨架
  核心逻辑：一个 Deck 实例加一个 ScatterplotLayer，不用 React、不接底图
  数据：页面内写死的 16 个城市坐标与人口权重
  依赖：deck.gl 9.0 · 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>最小骨架</title>
<style>
  html,body{height:100%;margin:0;background:#0d1117}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif;color:#e6e8ec}
  .bar{position:relative;z-index:5;flex:0 0 auto;padding:8px 12px;background:#161b22;border-bottom:1px solid #252c36;
       display:flex;gap:14px;align-items:center;font-size:12px;color:#8b93a1;flex-wrap:wrap}
  .bar b{color:#58a6ff;font-weight:600}
  #cv{flex:1 1 auto;min-height:0;width:100%}
</style>
</head>
<body>
<div class="bar">
  <span>图层 <b>1</b></span>
  <span>点数 <b id="n">—</b></span>
  <span>拖拽平移 · 滚轮缩放 · 右键改俯仰</span>
</div>
<canvas id="cv"></canvas>
<script src="https://cdn.jsdelivr.net/npm/deck.gl@9.0.35/dist.min.js"></script>
<script>
(function () {
  'use strict';

  if (typeof deck === 'undefined') {
    document.body.innerHTML =
      '<div style="padding:24px;color:#ff8c74">deck.gl 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  /* 骨架里的数据尽量小：坐标、名称、一个用于映射颜色的数值 */
  var data = [
    ['北京', 116.39, 39.90, 2189], ['上海', 121.47, 31.23, 2487],
    ['广州', 113.26, 23.12, 1868], ['深圳', 114.06, 22.54, 1756],
    ['成都', 104.06, 30.57, 2094], ['重庆', 106.55, 29.56, 3205],
    ['武汉', 114.30, 30.59, 1365], ['西安', 108.94, 34.34, 1295],
    ['杭州', 120.15, 30.28, 1194], ['南京', 118.80, 32.06, 931],
    ['沈阳', 123.43, 41.80, 902], ['哈尔滨', 126.64, 45.75, 1001],
    ['昆明', 102.71, 25.04, 846], ['乌鲁木齐', 87.61, 43.82, 405],
    ['拉萨', 91.11, 29.65, 87], ['海口', 110.20, 20.04, 287]
  ].map(function (d) {
    return { name: d[0], lng: d[1], lat: d[2], pop: d[3] };
  });

  document.getElementById('n').textContent = data.length;

  var scatter = new deck.ScatterplotLayer({
    id: 'city-points',
    data: data,
    getPosition: function (d) { return [d.lng, d.lat]; },
    /* 半径跟人口走，再用像素上下限兜住极端值 */
    getRadius: function (d) { return Math.sqrt(d.pop) * 40; },
    radiusUnits: 'meters',
    radiusMinPixels: 4,
    radiusMaxPixels: 26,
    getFillColor: function (d) { return d.pop > 1500 ? [255, 138, 76] : [64, 156, 255]; },
    stroked: true,
    lineWidthMinPixels: 1,
    getLineColor: [220, 235, 255, 120],
    pickable: true
  });

  var deckgl = new deck.Deck({
    canvas: document.getElementById('cv'),
    width: '100%',
    height: '100%',
    initialViewState: {
      longitude: 108,
      latitude: 34,
      zoom: 3,
      pitch: 0,
      bearing: 0,
      maxPitch: 60
    },
    controller: true,
    layers: [scatter],
    getTooltip: function (info) {
      if (!info.object) return null;
      return info.object.name + ' · 常住人口 ' + info.object.pop + ' 万';
    }
  });

  window.__deck = deckgl;
})();
</script>
</body>
</html>