Hexagon Radius

<!--
  示例：六边形半径
  要点：HexagonLayer 半径随滑块变化，实时对比聚合粒度
  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>六边形半径</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">
  <label>半径 <input id="rad" type="range" min="250" max="1500" step="50" value="700"> <b id="rv">700 m</b></label>
  <span>点数 <b id="n">—</b></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 pts = [];
  for (var i = 0; i < 8000; i++) {
    var c = i % 3;
    pts.push({
      lng: 116.24 + Math.random() * 0.32,
      lat: 39.80 + Math.random() * 0.18,
      v: c === 0 ? 1 : (c === 1 ? 2 : 3)
    });
  }

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

  function hexLayer(radius) {
    return new deck.HexagonLayer({
      id: 'hex',
      data: pts,
      getPosition: function (d) { return [d.lng, d.lat]; },
      radius: radius,
      coverage: 0.9,
      extruded: false,
      colorAggregation: 'SUM',
      getColorWeight: function (d) { return d.v; },
      colorDomain: [0, 240],
      colorRange: [
        [26, 46, 96, 170], [30, 112, 170, 195],
        [86, 198, 178, 210], [250, 206, 98, 225], [232, 94, 66, 235]
      ],
      pickable: true
    });
  }

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: { longitude: 116.40, latitude: 39.89, zoom: 10.2, pitch: 0, bearing: 0 },
    controller: true,
    layers: [hexLayer(700)],
    getTooltip: function (info) {
      if (!info.object) return null;
      return '累计 ' + info.object.colorValue.toFixed(0) + ' · 点 ' + info.object.count;
    }
  });

  document.getElementById('rad').addEventListener('input', function (e) {
    var r = parseInt(e.target.value, 10);
    document.getElementById('rv').textContent = r + ' m';
    deckgl.setProps({ layers: [hexLayer(r)] });
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>