Kml Tours

<!--
  示例：相机巡航
  说明：相机沿四个观察点依次飞行，每站停留后转向下一站
  核心逻辑：camera.flyTo 关键帧 → 定时推进站点 → 每站俯仰角不同
  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>相机巡航</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}

  .info{position:absolute;right:12px;top:12px;background:rgba(23,28,35,.92);
        border:1px solid #2a313b;border-radius:6px;padding:8px 12px;font-size:12px;color:#cfe2f5}
  .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">四段飞行串成一条巡游路线，这就是 KML Tour 在三维里的等价效果。</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 stops = [
    { lon: 116.3830, lat: 39.9000, h: 900, heading: 20, pitch: -35, title: '西南角' },
    { lon: 116.3960, lat: 39.9010, h: 700, heading: -40, pitch: -28, title: '东侧街区' },
    { lon: 116.3895, lat: 39.9080, h: 620, heading: 180, pitch: -32, title: '北侧总览' },
    { lon: 116.3895, lat: 39.9035, h: 260, heading: 0, pitch: -8, title: '街心近景' }
  ];

  for (var i = 0; i < 9; i++) {
    viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(116.3852 + i * 0.0011, 39.9030, 26),
      box: {
        dimensions: new Cesium.Cartesian3(30, 26, 52),
        material: Cesium.Color.fromCssColorString('#5a6d82')
      }
    });
  }

  var tag = document.createElement('div');
  tag.className = 'info';
  document.body.appendChild(tag);

  var idx = -1;
  function next() {
    idx = (idx + 1) % stops.length;
    var s = stops[idx];
    tag.textContent = '第 ' + (idx + 1) + ' 站：' + s.title;
    viewer.camera.flyTo({
      destination: Cesium.Cartesian3.fromDegrees(s.lon, s.lat, s.h),
      orientation: {
        heading: Cesium.Math.toRadians(s.heading),
        pitch: Cesium.Math.toRadians(s.pitch),
        roll: 0
      },
      duration: 2.4
    });
    setTimeout(next, 4600);
  }
  next();
  /* 相机由巡航逻辑推进 */
})();
</script>
</body>
</html>