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<!--
  示例：离线部署的路径设置
  说明：把资源根路径指向本地目录，页面不请求任何 ion 服务也能出图
  核心逻辑：buildModuleUrl.setBaseUrl → baseLayer:false → 本地资源目录
  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>离线部署的路径设置</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">示例把资源根路径指向 CDN 目录；改成站点内的 /cesium 路径就是完全离线的写法。</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;

  /* 资源根路径：离线时改成站点内的相对目录，例如 './Cesium/' */
  Cesium.buildModuleUrl.setBaseUrl(
    'https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/'
  );

  /* 关闭所有需要远程服务的默认项 */
  var localGlobe = scene.globe;
  localGlobe.baseColor = Cesium.Color.fromCssColorString('#16212c');

  viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(116.3895, 39.9035, 1200),
    ellipsoid: {
      radii: new Cesium.Cartesian3(1200, 1200, 1200),
      material: new Cesium.ColorMaterialProperty(
        Cesium.Color.fromCssColorString('#4d9bff').withAlpha(0.5)
      )
    }
  });

  viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(116.3895, 39.9035, 0),
    ellipse: {
      semiMajorAxis: 2600, semiMinorAxis: 2600,
      material: Cesium.Color.fromCssColorString('#1d2a36').withAlpha(0.9)
    }
  });
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3750, 39.8920, 6200),
    orientation: { heading: 0, pitch: Cesium.Math.toRadians(-16), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>