Grid

<!--
  示例：deck.gl 网格聚合
  要点：GridLayer 用米制方格统计点位，颜色聚合方式可在总量、均值、极值间切换
  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>网格聚合</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:8px;align-items:center;font-size:12px;color:#8b93a1;flex-wrap:wrap}
  .bar b{color:#58a6ff;font-weight:600}
  .bar button{font:inherit;font-size:12px;padding:3px 10px;border-radius:5px;cursor:pointer;
              border:1px solid #303845;background:#1d2531;color:#c8d2e0}
  .bar button:hover{background:#253040}
  .bar button.on{background:#2c4a7a;border-color:#4f8ad6;color:#dfe9ff}
  .bar .sep{width:1px;height:18px;background:#2a313c;margin:0 4px}
  #cv{flex:1 1 auto;min-height:0;width:100%}
</style>
</head>
<body>
<div class="bar">
  <span>点数 <b id="n">—</b></span>
  <span>方格 700 m</span>
  <span class="sep"></span>
  <span>颜色聚合</span>
  <button data-agg="SUM" class="on">总量</button>
  <button data-agg="MEAN">均值</button>
  <button data-agg="MAX">最大值</button>
  <span class="sep"></span>
  <span>拖拽旋转 · 滚轮缩放</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;
  }

  /* 沿一条东西向走廊分布，叠加两个次中心 */
  var points = [];
  for (var i = 0; i < 60000; i++) {
    var t = Math.random();
    var lng = 121.30 + t * 0.28 + (Math.random() - 0.5) * 0.03;
    var lat = 31.18 + Math.sin(t * Math.PI) * 0.05 + (Math.random() - 0.5) * 0.03;
    var flow = 1.5 + 9 * Math.exp(-Math.pow(t - 0.58, 2) / 0.03) + Math.random() * 2;

    if (i % 5 === 0) {
      lng = 121.52 + (Math.random() + Math.random() - 1) * 0.05;
      lat = 31.14 + (Math.random() + Math.random() - 1) * 0.04;
      flow = 2 + Math.random() * 7;
    }

    points.push({
      lng: lng,
      lat: lat,
      flow: flow
    });
  }

  document.getElementById('n').textContent = points.length.toLocaleString();

  var colorRange = [
    [12, 26, 54, 160],
    [26, 76, 132, 185],
    [34, 138, 172, 200],
    [110, 194, 158, 215],
    [246, 204, 92, 230],
    [236, 112, 54, 245]
  ];

  var aggregation = 'SUM';

  function buildLayer() {
    return new deck.GridLayer({
      id: 'grid',
      data: points,
      getPosition: function (d) { return [d.lng, d.lat]; },
      cellSize: 700,
      coverage: 0.86,
      extruded: true,
      elevationScale: 0.35,
      getColorWeight: function (d) { return d.flow; },
      colorAggregation: aggregation,
      getElevationWeight: function (d) { return d.flow; },
      elevationAggregation: 'SUM',
      colorRange: colorRange,
      upperPercentile: 100,
      material: { ambient: 0.5, diffuse: 0.7, shininess: 16 },
      pickable: true
    });
  }

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: {
      longitude: 121.44,
      latitude: 31.20,
      zoom: 10.9,
      pitch: 26,
      bearing: 5,
      maxPitch: 68
    },
    controller: true,
    layers: [buildLayer()],
    getTooltip: function (info) {
      if (!info.object) return null;
      var v = info.object.colorValue;
      return info.object.count + ' 个点 · 聚合值 ' +
        (v === undefined ? '—' : v.toFixed(1));
    }
  });

  var buttons = document.querySelectorAll('[data-agg]');
  for (var b = 0; b < buttons.length; b++) {
    buttons[b].addEventListener('click', function (e) {
      aggregation = e.currentTarget.getAttribute('data-agg');
      for (var k = 0; k < buttons.length; k++) {
        buttons[k].classList.toggle('on', buttons[k] === e.currentTarget);
      }
      deckgl.setProps({ layers: [buildLayer()] });
    });
  }

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