h-cesium-viewer

src/pages/_cesium-demos/归档/SatelliteEntity.ts

@@ -0,0 +1,108 @@
+import type { Cartesian3 } from 'cesium';
+
+import * as Cesium from 'cesium';
+import { propagate, type SatRec, twoline2satrec } from 'satellite.js';
+
+class SatelliteEntity {
+  private leadTime!: number;
+  private name!: string;
+  private satrec: SatRec;
+  private stepSeconds!: number;
+  private tleLine1!: string;
+  private tleLine2!: string;
+  private totalSeconds!: number;
+  private trailTime!: number;
+
+  constructor(tle2LineString = '' /* , options = {} */) {
+    const [name, tleLine1, tleLine2] = this._checkTle(tle2LineString);
+    const circle = Number(tleLine2.slice(52, 64));
+
+    this.name = name.trim();
+    this.tleLine1 = tleLine1.trim();
+    this.tleLine2 = tleLine2.trim();
+    this.satrec = twoline2satrec(this.tleLine1, this.tleLine2);
+
+    this.totalSeconds = 86_400; // 24小时
+    this.stepSeconds = 100;
+    this.leadTime = Math.round((24 * 3600) / circle);
+    this.trailTime = 0;
+  }
+
+  _checkTle(tle2LineString: string) {
+    const elements = tle2LineString.split('\n');
+    if (elements.length !== 3) throw new Error('tle data error');
+    return elements as [string, string, string];
+  }
+
+  // 创建PositionProperty
+  _getPositionProperty() {
+    const start = Cesium.JulianDate.fromIso8601(new Date().toISOString());
+    const positionProperty = new Cesium.SampledPositionProperty(Cesium.ReferenceFrame.INERTIAL);
+
+    const now = Date.now();
+    for (let index = 0; index < this.totalSeconds / this.stepSeconds; index++) {
+      const sateTime = new Date(now + index * this.stepSeconds * 1000);
+      const sateCoord = this.getPositionEci(sateTime);
+      if (!sateCoord) continue;
+      const cesiumTime = Cesium.JulianDate.addSeconds(start, index * this.stepSeconds, new Cesium.JulianDate());
+      const cesiumPosition = {
+        x: sateCoord.x * 1000,
+        y: sateCoord.y * 1000,
+        z: sateCoord.z * 1000,
+      } as Cartesian3;
+      positionProperty.addSample(cesiumTime, cesiumPosition);
+    }
+    return positionProperty;
+  }
+
+  // 创建卫星实例
+  createSatelliteEntity() {
+    const start = Cesium.JulianDate.fromIso8601(new Date().toISOString());
+    const stop = Cesium.JulianDate.addSeconds(start, this.totalSeconds, new Cesium.JulianDate());
+    const color = Cesium.Color.fromRandom({ alpha: 1 });
+    const satelliteEntity = {
+      availability: new Cesium.TimeIntervalCollection([new Cesium.TimeInterval({ start, stop })]),
+      description: this.name,
+      label: {
+        backgroundColor: new Cesium.Color(0.165, 0.165, 0.165, 0.5),
+        backgroundPadding: new Cesium.Cartesian2(4, 4),
+        fillColor: Cesium.Color.WHITE,
+        font: '12px sans-serif',
+        horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
+        outlineWidth: 1,
+        pixelOffset: new Cesium.Cartesian2(0, 5),
+        showBackground: true,
+        text: this.name,
+        verticalOrigin: Cesium.VerticalOrigin.TOP,
+        // distanceDisplayCondition: new Cesium.DistanceDisplayCondition(10.0, 50000000),
+      },
+      name: this.name,
+      path: new Cesium.PathGraphics({
+        leadTime: this.leadTime,
+        material: color,
+        show: true,
+        trailTime: this.trailTime,
+        width: 0.5,
+      }),
+      point: {
+        color,
+        pixelSize: 8,
+        // scaleByDistance: new Cesium.NearFarScalar(1.5e3, 1, 8.0e8, 0.5),
+      },
+      position: this._getPositionProperty(),
+    };
+    return satelliteEntity;
+  }
+
+  // 获取地心惯性坐标系坐标
+  getPositionEci(date: Date) {
+    const result = propagate(this.satrec, date);
+    // 检查position是否为对象且不是true
+    if (typeof result.position !== 'object' || result.position === null) {
+      return null;
+    }
+    return result.position;
+  }
+}
+
+export default SatelliteEntity;