Icon Atlas

<!--
  示例：自定义图标图集
  要点：IconLayer 用画布生成的图集，iconMapping 定义四种状态
  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>自定义图标图集</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>点位 <b id="n">—</b></span><span>图标来自页面内生成的图集</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 COLORS = ['#4f9ef8', '#f2a24b', '#63c47e', '#e2637a'];
  var NAMES = ['a', 'b', 'c', 'd'];
  var canvas = document.createElement('canvas');
  canvas.width = 256;
  canvas.height = 64;
  var ctx = canvas.getContext('2d');
  for (var i = 0; i < 4; i++) {
    ctx.beginPath();
    ctx.arc(32 + i * 64, 32, 24, 0, Math.PI * 2);
    ctx.fillStyle = COLORS[i];
    ctx.fill();
    ctx.lineWidth = 4;
    ctx.strokeStyle = 'rgba(10,16,26,0.85)';
    ctx.stroke();
    ctx.beginPath();
    ctx.arc(32 + i * 64, 32, 9, 0, Math.PI * 2);
    ctx.fillStyle = 'rgba(255,255,255,0.9)';
    ctx.fill();
  }

  var mapping = {};
  for (var m = 0; m < 4; m++) {
    mapping[NAMES[m]] = { x: m * 64, y: 0, width: 64, height: 64, anchorY: 32, mask: false };
  }

  var nodes = [];
  for (var k = 0; k < 36; k++) {
    nodes.push({
      lng: 116.24 + Math.random() * 0.32,
      lat: 39.80 + Math.random() * 0.18,
      icon: NAMES[k % 4],
      v: Math.round(20 + Math.random() * 380)
    });
  }

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

  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: [
      new deck.IconLayer({
        id: 'icons',
        data: nodes,
        iconAtlas: canvas.toDataURL('image/png'),
        iconMapping: mapping,
        getIcon: function (d) { return d.icon; },
        getPosition: function (d) { return [d.lng, d.lat]; },
        getSize: 22,
        sizeUnits: 'pixels',
        billboard: false,
        pickable: true
      })
    ],
    getTooltip: function (info) {
      if (!info.object) return null;
      return '状态 ' + info.object.icon + ' · 数值 ' + info.object.v;
    }
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>