Cylinder Cone

<!--
  示例：圆柱、圆锥与圆台三种回转体
  要点：CylinderGraphics 用 topRadius 与 bottomRadius 区分形状，length 控制总高
  依赖：CesiumJS 1.121 · jsDelivr CDN，无需任何外部模型
-->
<!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>圆柱与圆锥</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,.9);
       border:1px solid #2a313b;border-radius:6px;padding:9px 12px;font-size:12px;
       color:#a2a9b6;max-width:250px}
  .hud b{color:#e6e8ec;font-weight:600}
  .hud .row{margin-top:6px}
  .hud button{font:inherit;font-size:12px;padding:3px 9px;margin-right:4px;border-radius:4px;
       cursor:pointer;border:1px solid #343b46;background:#1d232b;color:#cfd6e2}
  .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>回转体三兄弟</b></div>
  <div class="row">圆柱 · 圆锥 · 圆台</div>
  <div class="row">
    <button id="outline">切换棱线</button>
  </div>
  <div class="row" id="info">outline 默认开启</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;

  /* 经度、纬度、上半径、下半径、高度、颜色、名称 */
  var SHAPES = [
    [116.380, 39.906, 160, 160, 520, '#4d9bff', '圆柱'],
    [116.388, 39.906, 0, 230, 520, '#ffb13d', '圆锥'],
    [116.396, 39.906, 110, 240, 380, '#5fd0a8', '圆台']
  ];

  var cylinders = [];

  SHAPES.forEach(function (s) {
    var e = viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(s[0], s[1], s[4] / 2),
      cylinder: {
        length: s[4],
        topRadius: s[2],
        bottomRadius: s[3],
        material: Cesium.Color.fromCssColorString(s[5]).withAlpha(0.72),
        outline: true,
        outlineColor: Cesium.Color.fromCssColorString('#eaf2ff'),
        numberOfVerticalLines: 12
      },
      label: {
        text: s[6] + ' topRadius ' + s[2],
        font: '500 12px "Microsoft YaHei", sans-serif',
        fillColor: Cesium.Color.WHITE,
        pixelOffset: new Cesium.Cartesian2(0, -14),
        disableDepthTestDistance: Number.POSITIVE_INFINITY,
        heightReference: Cesium.HeightReference.RELATIVE_TO_GROUND
      }
    });
    cylinders.push(e);
  });

  /* 底座：把三个形体连在同一块地面上 */
  viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(116.388, 39.906, -3),
    box: {
      dimensions: new Cesium.Cartesian3(2600, 700, 6),
      material: Cesium.Color.fromCssColorString('#243140')
    }
  });

  var outlineOn = true;
  document.getElementById('outline').addEventListener('click', function () {
    outlineOn = !outlineOn;
    cylinders.forEach(function (e) { e.cylinder.outline = outlineOn; });
    document.getElementById('info').textContent = outlineOn
      ? 'outline 开启 · 12 条母线' : 'outline 关闭 · 只留面';
  });

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.376, 39.894, 2400),
    orientation: {
      heading: Cesium.Math.toRadians(38),
      pitch: Cesium.Math.toRadians(-30),
      roll: 0
    },
    duration: 0
  });
})();
</script>
</body>
</html>