Polygon Layer

<!--
  示例：面图层填充
  要点：PolygonLayer 用环形数组画面，填充按数值插值，描边固定像素宽度
  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>面图层填充</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>面要素 <b id="n">—</b></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;
  }
  var cells = [];
  for (var i = 0; i < 6; i++) {
    var cx = 116.30 + (i % 3) * 0.13;
    var cy = 39.86 + Math.floor(i / 3) * 0.11;
    var r = 0.035 + Math.random() * 0.015;
    var ring = [];
    for (var k = 0; k <= 24; k++) {
      var a = k / 24 * Math.PI * 2;
      var rr = r * (0.72 + Math.random() * 0.42);
      ring.push([cx + Math.cos(a) * rr, cy + Math.sin(a) * rr * 0.82]);
    }
    cells.push({ ring: ring, v: Math.random(), name: '区块 ' + (i + 1) });
  }

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

  var layer = new deck.PolygonLayer({
    id: 'areas',
    data: cells,
    getPolygon: function (d) { return d.ring; },
    getFillColor: function (d) {
      var t = d.v;
      return [Math.round(40 + 190 * t), Math.round(180 - 70 * t), Math.round(210 - 140 * t), 195];
    },
    filled: true,
    stroked: true,
    getLineColor: [226, 236, 250, 220],
    lineWidthUnits: 'pixels',
    getLineWidth: 1,
    lineWidthMinPixels: 1,
    pickable: true
  });

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: { longitude: 116.40, latitude: 39.91, zoom: 10.2, pitch: 0, bearing: 0 },
    controller: true,
    layers: [layer],
    getTooltip: function (info) {
      if (!info.object) return null;
      return info.object.name + ' · 数值 ' + info.object.v.toFixed(2);
    }
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>