Heatmap Weight

<!--
  示例：热力图权重
  要点：HeatmapLayer 用 getWeight 让少数高点贡献更大的热度
  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>热力图权重</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>点 <b id="n">—</b></span><span>左侧多点低权重 · 右侧少点高权重</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 = [];
  var i;
  for (i = 0; i < 5000; i++) {
    pts.push({
      lng: 116.30 + (Math.random() + Math.random() - 1) * 0.05,
      lat: 39.89 + (Math.random() + Math.random() - 1) * 0.04,
      w: 0.35
    });
  }
  for (i = 0; i < 700; i++) {
    pts.push({
      lng: 116.44 + (Math.random() + Math.random() - 1) * 0.04,
      lat: 39.89 + (Math.random() + Math.random() - 1) * 0.035,
      w: 2.4
    });
  }

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

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: { longitude: 116.37, latitude: 39.89, zoom: 10.5, pitch: 0, bearing: 0 },
    controller: true,
    layers: [
      new deck.HeatmapLayer({
        id: 'heat',
        data: pts,
        getPosition: function (d) { return [d.lng, d.lat]; },
        getWeight: function (d) { return d.w; },
        radiusPixels: 34,
        intensity: 1.4,
        threshold: 0.04,
        colorRange: [
          [16, 34, 76, 0], [28, 92, 158, 170], [56, 172, 186, 205],
          [248, 208, 110, 225], [232, 96, 62, 240]
        ]
      })
    ]
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>