Time Availability

<!--
  示例：用时间区间控制实体出现与消失
  要点：TimeIntervalCollection + TimeInterval 描述窗口，按 clock 时间逐帧设置 show
  依赖：CesiumJS 1.121 · jsDelivr CDN，窗口时间写在页面里
-->
<!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>时间区间显隐</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%}
  .hud{position:absolute;left:12px;top:12px;z-index:5;background:rgba(23,28,35,.92);
       border:1px solid #2a313b;border-radius:6px;padding:9px 12px;font-size:12px;
       color:#a2a9b6;width:262px}
  .hud b{color:#e6e8ec;font-weight:600}
  .hud .row{margin-top:6px}
  .hud button{font:inherit;font-size:12px;padding:3px 9px;border-radius:4px;cursor:pointer;
       border:1px solid #343b46;background:#1d232b;color:#cfd6e2}
  .win{display:flex;justify-content:space-between;line-height:1.9;color:#7f8896}
  .win.on{color:#cfe4ff}
  .mono{font-family:ui-monospace,Consolas,monospace;font-size:11px;color:#8fb7e0}
  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
</style>
</head>
<body>
<div id="c"></div>
<div class="hud">
  <div><b>时间区间显隐</b></div>
  <div class="row mono" id="now">—</div>
  <div class="row" id="w0"><span class="win">A 00:00 ~ 00:40</span></div>
  <div class="row" id="w1"><span class="win">B 00:30 ~ 01:10</span></div>
  <div class="row" id="w2"><span class="win">C 01:00 ~ 01:30</span></div>
  <div class="row"><button id="toggle">暂停</button></div>
</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 START = Cesium.JulianDate.fromIso8601('2026-10-28T00:00:00Z');
  var clock = viewer.clock;
  clock.startTime = START.clone();
  clock.stopTime = Cesium.JulianDate.addSeconds(START, 5400, new Cesium.JulianDate());
  clock.currentTime = START.clone();
  clock.multiplier = 60;
  clock.clockRange = Cesium.ClockRange.LOOP_STOP;
  clock.shouldAnimate = true;

  function at(minute) {
    return Cesium.JulianDate.addSeconds(START, minute * 60, new Cesium.JulianDate());
  }

  /* 三个站点的可用窗口，最小单位是分钟 */
  var STATIONS = [
    { name: 'A', lng: 116.374, lat: 39.906, from: 0, to: 40, color: '#4d9bff' },
    { name: 'B', lng: 116.389, lat: 39.906, from: 30, to: 70, color: '#5fd0a8' },
    { name: 'C', lng: 116.404, lat: 39.906, from: 60, to: 90, color: '#ffb13d' }
  ];

  STATIONS.forEach(function (s) {
    var entity = viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(s.lng, s.lat, 0),
      point: {
        pixelSize: 14,
        color: Cesium.Color.fromCssColorString(s.color),
        outlineColor: Cesium.Color.WHITE,
        outlineWidth: 2,
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      },
      label: {
        text: '站点 ' + s.name,
        font: '600 13px "Microsoft YaHei", sans-serif',
        fillColor: Cesium.Color.fromCssColorString(s.color),
        pixelOffset: new Cesium.Cartesian2(0, -22),
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      }
    });

    s.entity = entity;
    s.intervals = new Cesium.TimeIntervalCollection([
      new Cesium.TimeInterval({
        start: at(s.from),
        stop: at(s.to),
        isStartIncluded: true,
        isStopIncluded: true
      })
    ]);

    /* 同时把可用窗口挂到实体上，数据导出或换到数据源时同样生效 */
    entity.availability = s.intervals;
  });

  /* 连接三个站点的线，也跟着时间显隐 */
  var link = viewer.entities.add({
    polyline: {
      positions: Cesium.Cartesian3.fromDegreesArray([
        116.374, 39.906, 116.389, 39.906, 116.404, 39.906
      ]),
      width: 2,
      material: new Cesium.PolylineDashMaterialProperty({
        color: Cesium.Color.fromCssColorString('#3f5a78'),
        dashLength: 20
      }),
      clampToGround: true
    }
  });

  /* 每帧按当前 clock 时间决定显隐，逻辑一目了然 */
  var nowEl = document.getElementById('now');
  var rowEls = [
    document.getElementById('w0'),
    document.getElementById('w1'),
    document.getElementById('w2')
  ];

  scene.preRender.addEventListener(function () {
    var active = 0;
    STATIONS.forEach(function (s, i) {
      var visible = s.intervals.contains(clock.currentTime);
      s.entity.show = visible;
      rowEls[i].firstElementChild.className = visible ? 'win on' : 'win';
      if (visible) active++;
    });
    link.show = active >= 2;
    nowEl.textContent = Cesium.JulianDate.toIso8601(clock.currentTime, 0).slice(11, 19);
  });

  var paused = false;
  document.getElementById('toggle').addEventListener('click', function () {
    paused = !paused;
    clock.shouldAnimate = !paused;
    this.textContent = paused ? '继续' : '暂停';
  });

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.389, 39.888, 3200),
    orientation: {
      heading: 0,
      pitch: Cesium.Math.toRadians(-32),
      roll: 0
    },
    duration: 0
  });
})();
</script>
</body>
</html>