Text Style

<!--
  示例：文字样式
  要点：TextLayer 配置中文字符集与 SDF 字体，按等级分字号并加背景板
  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>文字样式</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>标注 <b id="n">—</b></span><span>字号三级 · 背景板加深色描边</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 names = ['北京', '上海', '广州', '成都', '西安', '武汉', '杭州', '深圳'];
  var lnglat = [[116.39, 39.90], [121.47, 31.23], [113.26, 23.12], [104.06, 30.57],
                 [108.94, 34.34], [114.30, 30.59], [120.15, 30.28], [114.05, 22.54]];
  var nodes = names.map(function (n, i) {
    return { name: n, lng: lnglat[i][0], lat: lnglat[i][1], level: i < 2 ? 3 : (i < 5 ? 2 : 1) };
  });

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

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    initialViewState: { longitude: 112, latitude: 32, zoom: 3.6, pitch: 0, bearing: 0 },
    controller: true,
    layers: [
      new deck.TextLayer({
        id: 'labels',
        data: nodes,
        getText: function (d) { return d.name; },
        getPosition: function (d) { return [d.lng, d.lat]; },
        characterSet: '北京上海广州成都西安武汉杭州深圳',
        fontFamily: 'PingFang SC, Microsoft YaHei, sans-serif',
        fontSettings: { sdf: true, fontSize: 64, buffer: 4, radius: 12 },
        outlineWidth: 0.12,
        outlineColor: [8, 14, 26, 220],
        getSize: function (d) { return d.level === 3 ? 22 : (d.level === 2 ? 17 : 13); },
        sizeUnits: 'pixels',
        background: true,
        getBackgroundColor: [16, 24, 38, 205],
        backgroundPadding: [3, 2, 3, 2],
        getColor: [228, 238, 250, 255],
        getTextAnchor: 'middle',
        getAlignmentBaseline: 'center',
        billboard: true
      })
    ]
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>