Pick Highlight

<!--
  示例：点击实体后高亮并读出坐标
  要点：ScreenSpaceEventHandler 监听 LEFT_CLICK，scene.pick 拿到 Entity 再改样式
  依赖：CesiumJS 1.121 · jsDelivr CDN，无外部资源
-->
<!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>点击拾取高亮</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:252px}
  .hud b{color:#e6e8ec;font-weight:600}
  .hud .row{margin-top:6px}
  .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>点击拾取</b></div>
  <div class="row" id="name">点一个方块试试</div>
  <div class="row mono" id="pos">经度 — · 纬度 —</div>
  <div class="row">选中后棱线变亮、点变大</div>
  <div class="row">点空白处取消选中</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;

  /* 四个可点的方块，颜色各不相同 */
  var BLOCKS = [
    { name: '一号', lng: 116.378, lat: 39.902, h: 300, color: '#4d9bff' },
    { name: '二号', lng: 116.390, lat: 39.900, h: 200, color: '#5fd0a8' },
    { name: '三号', lng: 116.400, lat: 39.906, h: 380, color: '#ffb13d' },
    { name: '四号', lng: 116.388, lat: 39.913, h: 240, color: '#e35d6a' }
  ];

  var entities = [];

  BLOCKS.forEach(function (b) {
    var hover = viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(b.lng, b.lat, b.h / 2),
      box: {
        dimensions: new Cesium.Cartesian3(180, 180, b.h),
        material: Cesium.Color.fromCssColorString(b.color).withAlpha(0.55),
        outline: false
      },
      label: {
        text: b.name,
        font: '500 12px "Microsoft YaHei", sans-serif',
        fillColor: Cesium.Color.WHITE,
        pixelOffset: new Cesium.Cartesian2(0, -18),
        disableDepthTestDistance: Number.POSITIVE_INFINITY
      }
    });
    hover.baseColor = b.color;
    hover.baseHeight = b.h;
    entities.push(hover);
  });

  var selected = null;
  var outline = Cesium.Color.fromCssColorString('#ffd18a');

  function clear(entity) {
    entity.box.outline = false;
    entity.box.material = Cesium.Color.fromCssColorString(entity.baseColor).withAlpha(0.55);
    entity.label.fillColor = Cesium.Color.WHITE;
  }

  function highlight(entity) {
    entity.box.outline = true;
    entity.box.outlineColor = outline;
    entity.box.material = Cesium.Color.fromCssColorString('#ffd18a').withAlpha(0.28);
    entity.label.fillColor = outline;
  }

  var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
  var nameEl = document.getElementById('name');
  var posEl = document.getElementById('pos');

  handler.setInputAction(function (movement) {
    var picked = scene.pick(movement.position);

    if (selected) {
      clear(selected);
      selected = null;
    }

    if (!Cesium.defined(picked) || !Cesium.defined(picked.id) ||
        !Cesium.defined(picked.id.box)) {
      nameEl.textContent = '未选中实体';
      posEl.textContent = '经度 — · 纬度 —';
      return;
    }

    selected = picked.id;
    highlight(selected);

    var carto = Cesium.Cartographic.fromCartesian(selected.position.getValue(viewer.clock.currentTime));
    nameEl.textContent = '已选中 ' + selected.label.text.getValue(viewer.clock.currentTime);
    posEl.textContent = '经度 ' + Cesium.Math.toDegrees(carto.longitude).toFixed(4) +
      ' · 纬度 ' + Cesium.Math.toDegrees(carto.latitude).toFixed(4);
  }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

  /* 显示已进入拾取模式的提示 */
  scene.canvas.style.cursor = 'pointer';

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.374, 39.892, 1500),
    orientation: {
      heading: Cesium.Math.toRadians(18),
      pitch: Cesium.Math.toRadians(-26),
      roll: 0
    },
    duration: 0
  });
})();
</script>
</body>
</html>