标记便签字体和尺寸调小

src/scene/CesiumGlobe.js

@@ -54,7 +54,7 @@ function sphericalAreaKm2(polys) {
 
 // 生成便签 canvas：黄底圆角 + 左侧箭头 + 黑色加粗文字（整张图，箭头尖端指向坐标）
 function makeStickyNote(text, fontSize, selected = false) {
-  const padX = 10, padY = 6, radius = 8, arrowW = 12, arrowH = 16, S = 2; // S: 2x 超采样
+  const padX = 8, padY = 5, radius = 7, arrowW = 10, arrowH = 14, S = 2; // S: 2x 超采样
   const font = `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`;
   const m = document.createElement('canvas');
   const mctx = m.getContext('2d');
@@ -260,8 +260,8 @@ export class CesiumGlobe {
   _buildMarkers() {
     ENTRIES.forEach((entry, i) => {
       const position = Cesium.Cartesian3.fromDegrees(entry.lng, entry.lat);
-      const noteNormal = makeStickyNote(entry.name, 19, false);
-      const noteSelected = makeStickyNote(entry.name, 19, true);
+      const noteNormal = makeStickyNote(entry.name, 16, false);
+      const noteSelected = makeStickyNote(entry.name, 16, true);
       this.markers.push({ position, noteNormal, noteSelected, index: i });
     });
     this._initMarkerLayer();
@@ -415,7 +415,7 @@ export class CesiumGlobe {
 
   // 全部城市：Natural Earth 10m 人口稠密点（7342 个），中文名直接用数据自带的 name_zh
   async _buildCityLabels() {
-    const viewer = this.viewer;
+    const scene = this.viewer.scene;
     const textGold = Cesium.Color.fromCssColorString('#e0c46a');
     const black = Cesium.Color.fromCssColorString('#14100d');
     const ddc = new Cesium.DistanceDisplayCondition(0, 4e6);
@@ -430,30 +430,36 @@ export class CesiumGlobe {
       cities = [];
     }
 
+    // 用 primitive 集合替代 7342 个 entity，大幅降低 Cesium 实体系统开销
+    const points = new Cesium.PointPrimitiveCollection();
+    const labels = new Cesium.LabelCollection({ scene });
+    scene.primitives.add(points);
+    scene.primitives.add(labels);
+
     for (const c of cities) {
-      viewer.entities.add({
-        position: Cesium.Cartesian3.fromDegrees(c.lng, c.lat),
-        point: {
-          pixelSize: 3,
-          color: textGold,
-          outlineColor: black,
-          outlineWidth: 1,
-          heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
-          distanceDisplayCondition: ddc,
-          translucencyByDistance: tdc,
-        },
-        label: {
-          text: c.name,
-          font: 'bold 14px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif',
-          fillColor: black,
-          style: Cesium.LabelStyle.FILL,
-          horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
-          verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
-          pixelOffset: new Cesium.Cartesian2(0, -6),
-          heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
-          distanceDisplayCondition: ddc,
-          translucencyByDistance: tdc,
-        },
+      const position = Cesium.Cartesian3.fromDegrees(c.lng, c.lat);
+      points.add({
+        position,
+        pixelSize: 3,
+        color: textGold,
+        outlineColor: black,
+        outlineWidth: 1,
+        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
+        distanceDisplayCondition: ddc,
+        translucencyByDistance: tdc,
+      });
+      labels.add({
+        position,
+        text: c.name,
+        font: 'bold 14px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif',
+        fillColor: black,
+        style: Cesium.LabelStyle.FILL,
+        horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
+        verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
+        pixelOffset: new Cesium.Cartesian2(0, -6),
+        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
+        distanceDisplayCondition: ddc,
+        translucencyByDistance: tdc,
       });
     }
     this._dataReady();