/**
 * @name: index
 * @author: Administrator
 * @date: 2023-09-11 16:41
 * @description：index
 * @update: 2023-09-11 16:41
 */
import BillboardObject from "../../Obj/Base/BillboardObject";
import PolygonObject from "../../Obj/Base/PolygonObject";
import PolylineObject from "../../Obj/Base/PolylineObject";
import Circle from "../../Obj/Base/CircleDiffuse";

function exportKml(list = []) {

  let entities = new Cesium.EntityCollection();
  list.forEach(entity => {
    if (
      entity instanceof BillboardObject ||
      entity instanceof PolygonObject ||
      entity instanceof Circle ||
      entity instanceof PolylineObject
    ) {
      entities.add(entity.entity)
    }
  })
  if (entities.values.length) {
    let promise = Cesium.exportKml({entities})
    promise.then(e => {
      // Cesium.exportKml(e.kml,)
      funDownload(e.kml, new Date().getTime() + ".kml")
    })
  } else {
    console.error("允许导出为kml的对象为空")
  }
}

function funDownload(content, filename) {
  let eleLink = document.createElement("a");
  eleLink.download = filename;
  eleLink.style.display = "none";
  // 字符内容转变成blob地址
  let blob = new Blob([content]);
  eleLink.href = URL.createObjectURL(blob);
  // 触发点击
  document.body.appendChild(eleLink);
  eleLink.click();
  // 然后移除
  document.body.removeChild(eleLink);
}


export default exportKml