Labels

<!--
  示例：标注文字样式
  说明：六组标注用不同的字体、描边、背景与缩放策略，排成两行
  核心逻辑：label.font / outline / showBackground → distanceScale / translucencyByDistance
  依赖：CesiumJS 1.121 · 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>标注文字样式</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Widgets/widgets.css">
<style>
  html,body{height:100%;margin:0}
  body{background:#0e1116;color:#e6e8ec;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  #c{height:100%}
  .tip{position:absolute;left:12px;top:12px;z-index:5;
       background:rgba(23,28,35,.9);border:1px solid #2a313b;border-radius:6px;
       padding:8px 12px;font-size:12px;color:#a2a9b6;max-width:320px;line-height:1.6}

  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
</style>
</head>
<body>
<div id="c"></div>
<div class="tip">同一批标注，只是样式不同：描边、背景、按距离缩放都在这里演示。</div>
<script src="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Cesium.js"></script>
<script>
(function () {
  'use strict';

  var viewer = new Cesium.Viewer('c', {
    baseLayer: false,
    baseLayerPicker: false, geocoder: false, homeButton: false,
    sceneModePicker: false, navigationHelpButton: false,
    animation: false, timeline: false, fullscreenButton: false,
    infoBox: false, selectionIndicator: false
  });

  var scene = viewer.scene;
  scene.globe.baseColor = Cesium.Color.fromCssColorString('#1c2733');
  scene.backgroundColor = Cesium.Color.fromCssColorString('#0e1116');
  scene.skyBox.show = false;
  scene.sun.show = false;
  scene.moon.show = false;
  if (scene.skyAtmosphere) scene.skyAtmosphere.show = false;

  var lon = 116.3870, lat = 39.9028;

  function label(dx, dy, text, style) {
    var opt = {
      text: text,
      font: style.font || '500 15px sans-serif',
      fillColor: Cesium.Color.fromCssColorString(style.color || '#e6e8ec'),
      style: Cesium.LabelStyle.FILL,
      pixelOffset: new Cesium.Cartesian2(0, -18),
      disableDepthTestDistance: Number.POSITIVE_INFINITY
    };
    if (style.outline) {
      opt.style = Cesium.LabelStyle.FILL_AND_OUTLINE;
      opt.outlineColor = Cesium.Color.fromCssColorString('#0b0f14');
      opt.outlineWidth = 3;
    }
    if (style.background) {
      opt.showBackground = true;
      opt.backgroundColor = Cesium.Color.fromCssColorString('#13202c').withAlpha(0.85);
      opt.backgroundPadding = new Cesium.Cartesian2(8, 5);
    }
    if (style.scaleByDistance) {
      opt.scaleByDistance = new Cesium.NearFarScalar(300, 1.0, 3000, 0.45);
    }
    if (style.fadeByDistance) {
      opt.translucencyByDistance = new Cesium.NearFarScalar(800, 1.0, 3000, 0.0);
    }

    viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(lon + dx, lat + dy, 40),
      label: opt
    });
  }

  label(0.0000, 0.0000, '默认描边', { outline: true });
  label(0.0026, 0.0000, '带背景', { background: true, outline: true });
  label(0.0052, 0.0000, '远小近大', { scaleByDistance: true, outline: true });
  label(0.0000, -0.0018, '远去渐隐', { fadeByDistance: true, outline: true });
  label(0.0026, -0.0018, '等宽字体', { font: '500 15px Consolas, monospace', color: '#8fd3c0' });
  label(0.0052, -0.0018, '强调色', { font: '700 18px sans-serif', color: '#ffb13d', background: true });
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3905, 39.8978, 620),
    orientation: { heading: Cesium.Math.toRadians(0), pitch: Cesium.Math.toRadians(-42), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>