javascript - 如何使用绘图管理器从谷歌地图中删除绘制的圆或多边形 - ng2-map

Question

如何使用绘图管理器从谷歌地图中删除绘制的圆或多边形。

组件:

import {Ng2MapComponent, DrawingManager, Polygon} from 'ng2-map';

export class CreateAlertComponent implements OnInit {
   @ViewChild(Ng2MapComponent) mapObj: Ng2MapComponent;
   @ViewChild(DrawingManager) drawingManager: DrawingManager;

   polygonCompleteFunction(e) {
       console.log(this.mapObj);
   };

});

HTML:

<ng2-map [zoom]="mapOptions.zoom" [minZoom]="mapOptions.minZoom" [center]="mapOptions.center" clickable="false" (click)="mapClick($event)">
                    <drawing-manager *ngIf = "selectedJurisdictions.length > 0" 
                        [drawingMode]="'null'"
                        [drawingControl]="true"
                        [drawingControlOptions]="{
                        position: 2,
                        drawingModes: ['circle', 'polygon']
                        }"
                        [circleOptions]="{
                        fillColor: 'red',
                        fillOpacity: 0.3,
                        strokeColor: 'black',
                        strokeWeight: 2,
                        editable: true,
                        draggable: true,
                        zIndex: 1
                        }"
                        [polygonOptions]="{
                        fillColor: 'red',
                        fillOpacity: 0.3,
                        strokeColor: 'black',
                        strokeWeight: 2,
                        editable: true,
                        draggable: true,
                        zIndex: 1
                        }"
                        (polygoncomplete)="polygonCompleteFunction($event)"
                        (circlecomplete)="circleCompleteFunction($event)">
                    </drawing-manager>
</ng2-map>

但是在 polygon complete 函数或 circle complete 上，我没有从 map 对象中获取绘制的多边形

Answer 1

您可以从CircleComplete/PolygonCompolete 事件的参数中找到绘制的多边形或圆。或者通过event.overlay 从OverlayComplete 事件的参数中找到目标。 获取目标对象后，您可以将其保存在某个地方，以便在其他地方删除它们。

polygonCompleteFunction(e) {
   console.log(e);    // this is the drawn Polygon you are looking for, and same for the circleComplete event
};

overlayComplete(e) {
  console.log(e.overlay);  // here can also find the drawn shape(Polygon/Circle/Polyline/Rectangle)
}

删除目标Polygon或Circle时，参照之前保存的实例进行删除。

target.setMap(null);

这是关于 OverlayComplete 事件的 GooleMapApi 文档:

google.maps.event.addListener(drawingManager, 'circlecomplete', function(circle) { var radius = circle.getRadius(); });

google.maps.event.addListener(drawingManager, 'overlaycomplete', function(event) { if (event.type == 'circle') { var radius = event.overlay.getRadius(); } });

这是 link到 GoogleMapApi 文档。

希望对您有所帮助。这是一个 plunker可以引用。