React Google Maps not displaying HeatMap , lat and long not working for my positions

问题

This what i want, each marker to be sharing the same position as the lat and lng as the heatmap, the markers are working perfectly Im having problems sending data towards my heatmap, it seems like The heatmap from google receives and latitude and longitude differently than the markers positions? any idea ? when i create an array of list of objects like this but i want my data read just like my markers is reading it. It receive M for latitude and N for longitude. If i put a it inside a wrapper like {this.props.policeCall.map(({ A, M, N }) => { i get an error, when i make my heatmap position into position={{lat: M , lng:N}}

export class MapContainer extends Component {
  state = {
    showingInfoWindow: false, //Hides or the shows the infoWindow
    activeMarker: {}, //Shows the active marker upon click
    selectedPlace: {} //Shows the infoWindow to the selected place upon a marker
  };

  onMarkerClick = (props, marker, e) =>
    this.setState({
      selectedPlace: props,
      activeMarker: marker,
      showingInfoWindow: true
    });

  onClose = props => {
    if (this.state.showingInfoWindow) {
      this.setState({
        showingInfoWindow: false,
        activeMarker: null
      });
    }
  };

  render() {
   
    return (
      <Map
        google={this.props.google}
        zoom={14}
        style={mapStyles}
        initialCenter={{
          lat: 32.71573699,
          lng: -117.16108799
        }}
      >
        {this.props.policeCall.map(({ A, M, N }) => {
          return (
            <Marker
              onClick={this.onMarkerClick}
              name={A}
              position={{ lat: M, lng: N }}
            />
          );
        })}

        {this.props.policeCall.map(({ A, M, N }) => {
          return (
            <HeatMap
              gradient={gradient}
              opacity={3}
              position={{lat: M , lng:N}}
              radius={30}
              
            />
          );
        })}

        <InfoWindow
          marker={this.state.activeMarker}
          visible={this.state.showingInfoWindow}
          onClose={this.onClose}
        >
          <div>
            <h4>{this.state.selectedPlace.name}</h4>
          </div>
        </InfoWindow>
      </Map>
    );
  }
}

This how my data looks from the json it is reading it M and N is the lat and lng how can inject that to my heatmap data

module.exports = [
    {"A": "P17060024503", "B": "6/14/2017 21:54", "C": "4", "D": "10", "E": "", "F": "14TH", "G": "ST", "H": "10 14TH ST, San Diego, CA", "I": "1151", "J": "O", "K": "521", "L": "2", "M": "32.7054489", "N": "-117.1518696"},
    { "A": "P17030051227", "B": "3/29/2017 22:24", "C": "4", "D": "10", "E": "", "F": "14TH", "G": "ST", "H": "10 14TH ST, San Diego, CA", "I": "1016", "J": "A", "K": "521", "L": "2", "M": "32.7054544", "N": "-117.1467137"},
    { "A": "P17060004814", "B": "6/3/2017 18:04", "C": "7", "D": "10", "E": "", "F": "14TH", "G": "ST", "H": "10 14TH ST, San Diego, CA", "I": "1016", "J": "A", "K": "521", "L": "2", "M": "32.7053961", "N": "-117.1444185"},
    { "A": "P17030029336", "B": "3/17/2017 10:57", "C": "6", "D": "10", "E": "", "F": "14TH", "G": "ST", "H": "10 14TH ST, San Diego, CA", "I": "1151", "J": "OT", "K": "521", "L": "2", "M": "32.7054244", "N": "-117.1425917"},
    { "A": "P17030005412", "B": "3/3/2017 23:45", "C": "6", "D": "10", "E": "", "F": "15TH", "G": "ST", "H": "10 15TH ST, San Diego, CA", "I": "911P", "J": "CAN", "K": "521", "L": "2", "M": "32.7055067", "N": "-117.1405936"},

回答1:

According to source code of google-maps-react library, HeatMap component expects positions mandatory property instead of position:

       <HeatMap
          gradient={gradient}
          opacity={3}
          position={{lat: M , lng:N}}
          ^^^^^^^^^^^^^^^^^^^^^^^^^^
          radius={30}
        />

Given the provided data format, HeatMap could be initialized like this:

class MapContainer extends React.Component {

  render() {

    const positions = data.map(item => { return { "lat": item.M, "lng": item.N}});

    return (
      <div className="map-container">
        <Map
          google={this.props.google}
          className={"map"}
          zoom={this.props.zoom}
          initialCenter={this.props.center}
        >
          <HeatMap
            gradient={gradient}
            positions={positions}
            opacity={1}
            radius={20}
          />
        </Map>
      </div>
    );
  }
}

where data stores your JSON data

And last but no least, make sure visualization package is loaded (dependency to Google Heatmaps):

export default GoogleApiWrapper({
  apiKey: "--YOUR-KEY-GOES-HERE--",
  libraries: ["visualization"]
})(MapContainer);

Here is a demo (the example has been adapted from Google Maps documentation)

来源：https://stackoverflow.com/questions/55107150/react-google-maps-not-displaying-heatmap-lat-and-long-not-working-for-my-posit