Czml Polyline

<!--
  示例：CZML 折线的三种材质
  说明：同一组坐标分别用实色、polylineGlow 与 polylineOutline，另有贴地折线
  核心逻辑：polyline.width / material / clampToGround → CzmlDataSource.load
  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>CZML 折线</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%}
  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
</style>
</head>
<body>
<div id="c"></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.moon.show = false;
  if (scene.skyAtmosphere) scene.skyAtmosphere.show = false;

  function ring(lat) {
    return [
      116.330, lat, 0,
      116.360, lat + 0.018, 0,
      116.400, lat + 0.024, 0,
      116.440, lat + 0.016, 0,
      116.462, lat - 0.004, 0
    ];
  }

  var data = [
    { id: 'document', name: '折线', version: '1.0' },
    {
      id: 'plain',
      position: { cartographicDegrees: [116.400, 39.940, 0] },
      polyline: {
        positions: { cartographicDegrees: ring(39.942) },
        width: 3,
        material: { solidColor: { color: { rgba: [210, 226, 245, 230] } } }
      }
    },
    {
      id: 'glow',
      position: { cartographicDegrees: [116.400, 39.922, 0] },
      polyline: {
        positions: { cartographicDegrees: ring(39.922) },
        width: 6,
        material: { polylineGlow: { color: { rgba: [255, 190, 60, 255] }, glowPower: 0.3 } }
      }
    },
    {
      id: 'outline',
      position: { cartographicDegrees: [116.400, 39.902, 0] },
      polyline: {
        positions: { cartographicDegrees: ring(39.902) },
        width: 8,
        material: {
          polylineOutline: {
            color: { rgba: [77, 155, 255, 255] },
            outlineColor: { rgba: [20, 40, 80, 255] },
            outlineWidth: 2
          }
        }
      }
    },
    {
      id: 'dash',
      position: { cartographicDegrees: [116.400, 39.882, 0] },
      polyline: {
        positions: { cartographicDegrees: ring(39.882) },
        width: 4,
        clampToGround: true,
        material: { polylineDash: { color: { rgba: [57, 192, 160, 255] }, dashLength: 18 } }
      }
    },
    {
      id: 'caption',
      position: { cartographicDegrees: [116.400, 39.860, 0] },
      label: {
        text: '实色 / 发光 / 描边 / 虚线贴地',
        font: '500 13px "Microsoft YaHei", sans-serif',
        fillColor: { rgba: [214, 228, 245, 255] },
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      }
    }
  ];

  Cesium.CzmlDataSource.load(data).then(function (ds) {
    viewer.dataSources.add(ds);
  });

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.400, 39.852, 26000),
    orientation: {
      heading: 0,
      pitch: Cesium.Math.toRadians(-42),
      roll: 0
    },
    duration: 0
  });
})();
</script>
</body>
</html>