feat: 添加卫星实体类及相关功能，优化 Cesium 初始化和时间线设置

src/pages/Satellite/Cesium/cesium-helper/00.cesium-init.ts

@@ -4,6 +4,8 @@ import { VIEWER_OPTIONS } from './00.cesium-init.VIEWER_OPTIONS';
 
 import 'cesium/Build/Cesium/Widgets/widgets.css';
 
+Cesium.Ion.defaultAccessToken = import.meta.env.VITE_CESIUM_ION_TOKEN; // 用了离线地图的情况是不需要的。
+
 Object.assign(window, { Cesium });
 
 _configureCesium();
@@ -13,6 +15,8 @@ export function cesium_init(container: Element) {
 
   viewer.scene.debugShowFramesPerSecond = true;
 
+  initTimeLine(viewer);
+
   return viewer;
 }
 
@@ -60,3 +64,15 @@ function _configureCesium() {
     60, // 北纬
   );
 }
+
+function initTimeLine(viewer: Cesium.Viewer, totalSeconds = /* 默认场景的时间跨度 */ 24 * 60 * 60) {
+  const start = Cesium.JulianDate.fromIso8601(new Date().toISOString());
+  const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());
+  viewer.clock.startTime = start.clone();
+  viewer.clock.stopTime = stop.clone();
+  viewer.clock.currentTime = start.clone();
+  viewer.timeline.zoomTo(start, stop);
+  viewer.clock.multiplier = 1;
+  viewer.clock.shouldAnimate = true;
+  viewer.clock.clockRange = Cesium.ClockRange.LOOP_STOP;
+}