REACT 如何使用 google-map-react 绘制路线？答案

【问题标题】：REACT how can i draw a route with google-map-react?REACT 如何使用 google-map-react 绘制路线？
【发布时间】：2019-05-17 07:07:19
【问题描述】：

如何使用 npm google-map-react 绘制路线？

这就是我所拥有的

this.map = (zoom, lat, lng) => { 让 DirectionsService = new window.google.maps.DirectionsService();

  DirectionsService.route(
    {
      origin: new window.google.maps.LatLng(40.407749, -3.710138), //
      destination: new window.google.maps.LatLng(40.762341, -3.788512), //
      travelmode: window.google.maps.TravelMode.DRIVING
    },
    (result, status) => {
      if (status === window.google.maps.DirectionsStatus.OK) {
        this.setState({
          direction: result
        });
      } else {
        console.error(`error fetching directions ${result}`);
      }
    }
  );

【问题讨论】：

标签： reactjs google-maps-api-3 google-map-react

【解决方案1】：

您可以这样做（sample code 和下面的代码 sn-p），其中您将在加载 API 时传递地图对象，然后使用 apiIsLoaded 函数调用路线服务。

import React, { Component } from "react";
import GoogleMapReact from "google-map-react";
import "./style.css";

class GoogleMaps extends Component {
  constructor(props) {
    super(props);

    this.state = {
      currentLocation: { lat: 40.756795, lng: -73.954298 }
    };
  }

  render() {
    const apiIsLoaded = (map, maps) => {
      const directionsService = new google.maps.DirectionsService();
      const directionsRenderer = new google.maps.DirectionsRenderer();
      directionsRenderer.setMap(map);
      const origin = { lat: 40.756795, lng: -73.954298 };
      const destination = { lat: 41.756795, lng: -78.954298 };

      directionsService.route(
        {
          origin: origin,
          destination: destination,
          travelMode: google.maps.TravelMode.DRIVING
        },
        (result, status) => {
          if (status === google.maps.DirectionsStatus.OK) {
            directionsRenderer.setDirections(result);
          } else {
            console.error(`error fetching directions ${result}`);
          }
        }
      );
    };
    return (
      <div>
        <div style={{ height: "400px", width: "100%" }}>
          <GoogleMapReact
            bootstrapURLKeys={{
              key: "YOUR_API_KEY"
            }}
            defaultCenter={{ lat: 40.756795, lng: -73.954298 }}
            defaultZoom={10}
            center={this.state.currentLocation}
            yesIWantToUseGoogleMapApiInternals
            onGoogleApiLoaded={({ map, maps }) => apiIsLoaded(map, maps)}
          />
        </div>
      </div>
    );
  }
}
export default GoogleMaps;

【讨论】：