如何使用 react-google-maps 在 React.JS 中获取多边形的坐标

Question

我想获取在 Google 的地图上绘制的多边形的所有坐标。这是我的代码

import React from "react";
import { compose, withProps } from "recompose";
import {
  withScriptjs,
  withGoogleMap,
  GoogleMap,
  Marker
} from "react-google-maps";
//import withScriptjs from "react-google-maps/lib/async/withScriptjs";
import { DrawingManager } from "react-google-maps/lib/components/drawing/DrawingManager";

const MyMapComponent = compose(
  withProps({
    /**
     * Note: create and replace your own key in the Google console.
     * https://console.developers.google.com/apis/dashboard
     * The key "AIzaSyBkNaAGLEVq0YLQMi-PYEMabFeREadYe1Q" can be ONLY used in this sandbox (no forked).
     */
    googleMapURL:
      "https://maps.googleapis.com/maps/api/js?key=AIzaSyALpmb4KhFoR2Kcvty21gzzegprl4ilIgs&v=3.exp&libraries=geometry,drawing,places",
    loadingElement: <div style={{ height: `100%` }} />,
    containerElement: <div style={{ height: `400px` }} />,
    mapElement: <div style={{ height: `100%` }} />
  }),
  withScriptjs,
  withGoogleMap
)(props => (
  <GoogleMap
    defaultZoom={8}
    defaultCenter={new window.google.maps.LatLng(-34.397, 150.644)}
  >
    <DrawingManager
      defaultDrawingMode={
        window.google.maps.drawing.OverlayType.ControlPosition
      }
      defaultOptions={{
        drawingControl: true,
        drawingControlOptions: {
          position: window.google.maps.ControlPosition.TOP_CENTER,
          drawingModes: [
            window.google.maps.drawing.OverlayType.CIRCLE,
            window.google.maps.drawing.OverlayType.POLYGON,
            window.google.maps.drawing.OverlayType.POLYLINE,
            window.google.maps.drawing.OverlayType.RECTANGLE
          ]
        },
        circleOptions: {
          fillColor: `#ffff00`,
          fillOpacity: 1,
          strokeWeight: 5,
          clickable: false,
          editable: true,
          zIndex: 1
        }
      }}
    />
    {props.isMarkerShown && (
      <Marker position={{ lat: -34.397, lng: 150.644 }} />
    )}
  </GoogleMap>
));

我的工作重点是获取应该在 Google 上绘制的多边形的所有坐标 Maps.I 还想使用 mongoose 和 NodeJs 将这些坐标存储在 MongoDB 中后端。

Answer 1

我们可以使用此函数获取多边形或任何其他反应角的所有坐标。

function getPaths(polygon) {

  var polygonBounds = polygon.getPath();
  var bounds = [];
  for (var i = 0; i < polygonBounds.length; i++) {
    var point = {
      lat: polygonBounds.getAt(i).lat(),
      lng: polygonBounds.getAt(i).lng()
    };
    bounds.push(point);
  }
  console.log(bounds);
}

并且在 GoogleMap 组件中，我通过给定的方式简化了上面的代码。

<DrawingManager
    drawingMode={"polygon"}
    onPolygonComplete={value => console.log(getPaths(value))} />

如何使用 react-google-maps 在 React.JS 中获取多边形的坐标

How to fetch coordinates of Polygon in React.JS using react-google-maps

node.js

reactjs

mongoose

react-google-maps