Polygon Extrude

<!--
  示例：面挤出
  要点：PolygonLayer 开启 extruded 后按属性拉起高度，侧面受光照影响
  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>面挤出</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}
  .bar label{display:flex;align-items:center;gap:5px;cursor:pointer}
  .bar input[type=checkbox]{accent-color:#4f9ef8}
  .bar input[type=range]{width:150px;accent-color:#4f9ef8}
  .bar button{font:inherit;font-size:12px;padding:3px 10px;border-radius:4px;cursor:pointer;
       border:1px solid #2f3947;background:#1d242e;color:#c9d3e0}
  .bar button:hover{background:#26303d}
  #cv{flex:1 1 auto;min-height:0;width:100%;display:block}

</style>
</head>
<body>
<div class="bar"><span>体块 <b id="n">—</b></span><span>悬停查看高度</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;
  }
  var blocks = [];
  for (var i = 0; i < 9; i++) {
    var cx = 116.31 + (i % 3) * 0.06;
    var cy = 39.85 + Math.floor(i / 3) * 0.05;
    var d = 0.022;
    blocks.push({
      ring: [
        [cx - d, cy - d], [cx + d, cy - d], [cx + d, cy + d], [cx - d, cy + d]
      ],
      h: 120 + Math.round(Math.random() * 620),
      name: '地块 ' + (i + 1)
    });
  }

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

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: { longitude: 116.40, latitude: 39.90, zoom: 10.6, pitch: 52, bearing: -18 },
    controller: true,
    layers: [
      new deck.PolygonLayer({
        id: 'blocks',
        data: blocks,
        getPolygon: function (d) { return d.ring; },
        getFillColor: [86, 156, 232, 210],
        extruded: true,
        getElevation: function (d) { return d.h; },
        elevationScale: 1,
        stroked: false,
        material: { ambient: 0.65, diffuse: 0.6, shininess: 40, specularColor: [40, 60, 90] },
        pickable: true
      })
    ],
    getTooltip: function (info) {
      if (!info.object) return null;
      return info.object.name + ' · 高度 ' + info.object.h + ' m';
    }
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>