Cesium Osm Buildings

<!--
  示例：OSM 建筑白模
  说明：按街区生成建筑白模，高度分层着色，点击可看到楼栋信息
  核心逻辑：程序化生成建筑盒体 → 高度映射颜色 → 拾取显示信息
  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>OSM 建筑白模</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;display:none;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">建筑数据由代码生成，点击任意楼栋会显示它的高度。</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 palette = ['#3b4a5c', '#46586c', '#52667d', '#5e738b', '#6a809a'];
  var buildings = [];

  for (var i = 0; i < 12; i++) {
    for (var j = 0; j < 8; j++) {
      var h = 24 + ((i * 7 + j * 5) % 9) * 9;
      var w = 26 + (i % 3) * 6, d = 24 + (j % 3) * 6;
      var e = viewer.entities.add({
        position: Cesium.Cartesian3.fromDegrees(
          116.3850 + i * 0.00078, 39.9018 + j * 0.00072, h / 2
        ),
        box: {
          dimensions: new Cesium.Cartesian3(w, d, h),
          material: Cesium.Color.fromCssColorString(palette[h % palette.length]).withAlpha(0.95),
          outline: true,
          outlineColor: Cesium.Color.fromCssColorString('#0b0f14')
        }
      });
      buildings.push({ entity: e, h: h });
    }
  }

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

  var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
  handler.setInputAction(function (click) {
    var picked = scene.pick(click.position);
    if (!Cesium.defined(picked) || !picked.id) { info.style.display = 'none'; return; }
    var hit = buildings.filter(function (b) { return b.entity === picked.id; })[0];
    info.style.display = 'block';
    info.textContent = hit ? ('楼高 ' + hit.h + ' 米') : '其他对象';
  }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3935, 39.8980, 620),
    orientation: { heading: Cesium.Math.toRadians(10), pitch: Cesium.Math.toRadians(-28), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>