Cesium 绘制漫游路径

TS中声名：
private arr: Array<number> = new Array<number>();

//绘制漫游路径
  public setRoaming_line(cartesian: any) {

    let cartographic = Cartographic.fromCartesian(cartesian);
    // 弧度转为角度（经纬度）
    let lon = Math.toDegrees(cartographic.longitude);
    let lat = Math.toDegrees(cartographic.latitude);
    //模型高度let height = cartographic.height + 5;

    this.arr.push(lon);
    this.arr.push(lat);
    console.log('数组：' + this.arr);
    console.log('数组长度：' + this.arr.length);

    this.drawPoint(Cartesian3.fromDegrees(lon, lat));

    if (this.arr.length > 2) {
      this.drawPolyline();
    }
  }

//绘制点
  private drawPoint(position: Cartesian3) {
    let viewer = this.viewerCesium;
    return viewer.entities.add({
      name: '点几何对象',
      position: position,
      point: {
        color: Color.SKYBLUE,
        pixelSize: 10,
        outlineColor: Color.YELLOW,
        outlineWidth: 3,
        disableDepthTestDistance: Number.POSITIVE_INFINITY,
        heightReference: HeightReference.CLAMP_TO_GROUND
      }
    });
  }

  //绘制线路
  private drawPolyline() {
    let viewer = this.viewerCesium;
    return viewer.entities.add({
      name: '线几何对象',
      polyline: {
        positions: new CallbackProperty(() => {
          return Cartesian3.fromDegreesArray(this.arr);
        }, false),
        width: 5.0,
        material: new PolylineGlowMaterialProperty({
          color: Color.GOLD
        }),
        depthFailMaterial: new PolylineGlowMaterialProperty({
          color: Color.GOLD
        }),
        clampToGround: true
      }
    });
  }

image.png