剛剛分享了地形開挖膜楷，覺得可能大部分業(yè)務(wù)是自定義多邊形砾嫉，然后開挖抡砂，基于此大咱，分享自定義繪制多邊形函數(shù)，引入即可使用

// 構(gòu)造唯一id
import { v4 as uuidv4 } from 'uuid';
// 坐標(biāo)轉(zhuǎn)化
const getLonLatFromCartesian = (cartesian3) => {
    const { longitude, latitude, height } = Cesium.Cartographic.fromCartesian(cartesian3);
    return {
        lng: +Cesium.Math.toDegrees(longitude),
        lat: +Cesium.Math.toDegrees(latitude),
        height: +height
    }
};
// 創(chuàng)建點(diǎn)
const createPoint = (viewer, Cartesian, options) => {
    const { lng, lat, height } = getLonLatFromCartesian(Cartesian)
    return viewer.entities.add({
        position: new Cesium.Cartesian3.fromDegrees(lng, lat, height),
        point: {
            pixelSize: options.pixelSize, 
            color: options.pointColor   
        }
    })
};
// 繪制多邊形
const DrawPolygon = (viewer, options = {}, callback) => {
    if (!viewer) throw new Error("no viewer object!");
    options = {
      id: uuidv4(),
      pointColor: Cesium.Color.fromCssColorString('#FFC107'),
      pixelSize: 8,
      outlineWidth: 5,
      outlineColor: new Cesium.Color(0, 64 / 255, 133 / 255, 0.8),
      color: Cesium.Color.fromCssColorString('rgba(0, 123, 255, 0.4)'),
      ...options
    };
    if (viewer.entities.getById(options.id)) {
      throw new Error("the id is an unique value");
    }
    const handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas);
    let activeShapePoints = [];
    let polygon = undefined;
    let floatingPoint = undefined;
    // 鼠標(biāo)左擊事件
    handler.setInputAction((event) => {
      let ray = viewer.camera.getPickRay(event.position);
      let earthPosition = viewer.scene.globe.pick(ray, viewer.scene);
      // 鼠標(biāo)開始點(diǎn)擊多邊形的第一個(gè)點(diǎn)
      if (activeShapePoints.length === 0) {
        floatingPoint = createPoint(viewer, earthPosition, options);
        // 將第一個(gè)左擊的點(diǎn)添加到多邊形頂點(diǎn)集合中
        activeShapePoints.push(earthPosition);
        // 多邊形的坐標(biāo)采用回調(diào)的形式
        // 多邊形邊界頂點(diǎn)
        let polylinePoints = new Cesium.CallbackProperty(() => {
          let vertexPoints = activeShapePoints.concat([activeShapePoints[0]]);
          return vertexPoints;
        }, false);
        // 多邊形頂點(diǎn)
        let dynamicPositions = new Cesium.CallbackProperty(() => {
          return new Cesium.PolygonHierarchy(activeShapePoints);
        }, false);
        // 添加一個(gè)多邊形
        polygon = viewer.entities.add({
          name: "customPolygon",
          id: options.id,
          polyline: {
            positions: polylinePoints,
            width: options.outlineWidth,
            material: options.outlineColor,
            clampToGround: true,
          },
          polygon: {
            hierarchy: dynamicPositions,
            material: options.color,
            heightReference: Cesium.HeightReference.NONE,
          },
        });
      }
      // 將鼠標(biāo)點(diǎn)擊的點(diǎn)添加到多邊形頂點(diǎn)集合中
      activeShapePoints.push(earthPosition);
      // 記錄多邊形邊界的點(diǎn)
      polygon.outLinePoint = (polygon.outLinePoint ?? []).concat(createPoint(viewer, earthPosition, options));
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
    // 鼠標(biāo)移動(dòng)事件
    handler.setInputAction((movement) => {
      // 獲取鼠標(biāo)所在的位置
      const ray = viewer.camera.getPickRay(movement.endPosition);
      const newPosition = viewer.scene.globe.pick(ray, viewer.scene);
      // 已經(jīng)定義了polygon
      if (Cesium.defined(polygon)) {
        floatingPoint.position.setValue(newPosition);
        // 刪除多邊形頂點(diǎn)中最新的一個(gè)點(diǎn)
        activeShapePoints.pop();
        // 將最新獲取到的點(diǎn)添加到多邊形頂點(diǎn)集合中
        activeShapePoints.push(newPosition);
      }
      if (activeShapePoints.length === 3) {
        polygon.polygon.heightReference = Cesium.HeightReference.CLAMP_TO_GROUND;
      }
    }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
    handler.setInputAction(() => {
      // 刪除最后一個(gè)點(diǎn)（重復(fù)添加的點(diǎn)）
      activeShapePoints.pop();
      polygon.pottingPoint = activeShapePoints;
      viewer.entities.remove(floatingPoint);
      floatingPoint = undefined;
      // 銷毀右擊事件
      handler.destroy();
      if (typeof callback === "function") callback(polygon);
    }, Cesium.ScreenSpaceEventType.RIGHT_DOWN);
  };
  export default DrawPolygon;

使用方法

DrawPolygon(this.viewer, {}, (polygon) => {
    console.log(polygon)
})

效果圖