Czml Point Time Dynamic

<!--
  示例：CZML 点的颜色与位置随时间变化
  说明：颜色按 interval 分段，位置用 epoch + cartographicDegrees 采样，clock 推进时间
  核心逻辑：color 数组带 interval → position 采样 → availability 与 clock 时间对齐
  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 点的时间动态</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;

  var start = Cesium.JulianDate.fromIso8601('2026-10-28T00:00:00Z');
  var stop = Cesium.JulianDate.addSeconds(start, 90, new Cesium.JulianDate());

  viewer.clock.startTime = start.clone();
  viewer.clock.stopTime = stop.clone();
  viewer.clock.currentTime = start.clone();
  viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP;
  viewer.clock.multiplier = 2;
  viewer.clock.shouldAnimate = true;

  var data = [
    {
      id: 'document',
      name: '点的时间动态',
      version: '1.0',
      clock: {
        interval: '2026-10-28T00:00:00Z/2026-10-28T00:01:30Z',
        currentTime: '2026-10-28T00:00:00Z',
        multiplier: 2,
        range: 'LOOP_STOP'
      }
    },
    {
      id: 'beacon',
      name: '信标',
      availability: '2026-10-28T00:00:00Z/2026-10-28T00:01:30Z',
      position: {
        epoch: '2026-10-28T00:00:00Z',
        interpolationAlgorithm: 'LINEAR',
        interpolationDegree: 1,
        cartographicDegrees: [
          0,  116.330, 39.870, 0,
          30, 116.380, 39.900, 0,
          60, 116.430, 39.880, 0,
          90, 116.400, 39.930, 0
        ]
      },
      point: {
        pixelSize: 16,
        color: {
          rgba: [
            { interval: '2026-10-28T00:00:00Z/2026-10-28T00:00:30Z', rgba: [77, 155, 255, 255] },
            { interval: '2026-10-28T00:00:30Z/2026-10-28T00:01:00Z', rgba: [255, 210, 90, 255] },
            { interval: '2026-10-28T00:01:00Z/2026-10-28T00:01:30Z', rgba: [228, 92, 122, 255] }
          ]
        },
        outlineColor: { rgba: [255, 255, 255, 230] },
        outlineWidth: 2,
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      },
      label: {
        text: '颜色按 30 秒一段切换',
        font: '500 12px "Microsoft YaHei", sans-serif',
        fillColor: { rgba: [225, 236, 250, 255] },
        pixelOffset: { cartesian2: [0, -24] },
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      }
    }
  ];

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

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.380, 39.878, 22000),
    orientation: {
      heading: 0,
      pitch: Cesium.Math.toRadians(-58),
      roll: 0
    },
    duration: 0
  });
})();
</script>
</body>
</html>