Layer Toggle

<!--
  示例：图层开关
  要点：勾选框控制三个图层的显示，复用的图层实例不重建
  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>图层开关</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><input type="checkbox" id="cbPoints" checked> 点位</label>
  <label><input type="checkbox" id="cbGrid" checked> 网格</label>
  <label><input type="checkbox" id="cbRing" checked> 范围圈</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 < 6000; i++) {
    pts.push({
      lng: 116.24 + Math.random() * 0.32,
      lat: 39.80 + Math.random() * 0.18,
      v: Math.random()
    });
  }

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

  var pointsLayer = new deck.ScatterplotLayer({
    id: 'points',
    data: pts,
    getPosition: function (d) { return [d.lng, d.lat]; },
    getRadius: 2.2,
    radiusUnits: 'pixels',
    radiusMinPixels: 1,
    getFillColor: [96, 186, 255, 190],
    pickable: true
  });

  var gridLayer = new deck.ScreenGridLayer({
    id: 'grid',
    data: pts,
    getPosition: function (d) { return [d.lng, d.lat]; },
    cellSizePixels: 24,
    colorDomain: [0, 40],
    colorRange: [[26, 46, 96, 120], [60, 168, 186, 190], [248, 206, 98, 210], [230, 92, 64, 230]]
  });

  var ringLayer = new deck.ScatterplotLayer({
    id: 'ring',
    data: [{ lng: 116.40, lat: 39.89 }],
    getPosition: function (d) { return [d.lng, d.lat]; },
    getRadius: 140,
    radiusUnits: 'meters',
    filled: false,
    stroked: true,
    getLineColor: [255, 176, 92, 220],
    getLineWidth: 2,
    lineWidthUnits: 'pixels',
    pickable: false
  });

  function currentLayers() {
    var out = [];
    if (document.getElementById('cbGrid').checked) out.push(gridLayer);
    if (document.getElementById('cbPoints').checked) out.push(pointsLayer);
    if (document.getElementById('cbRing').checked) out.push(ringLayer);
    return out;
  }

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: { longitude: 116.40, latitude: 39.89, zoom: 10.3, pitch: 0, bearing: 0 },
    controller: true,
    layers: currentLayers(),
    getTooltip: function (info) {
      if (!info.object || !info.object.v) return null;
      return '数值 ' + info.object.v.toFixed(2);
    }
  });

  ['cbPoints', 'cbGrid', 'cbRing'].forEach(function (id) {
    document.getElementById(id).addEventListener('change', function () {
      deckgl.setProps({ layers: currentLayers() });
    });
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>