jku-ba-react/src/maps/Mapbox.js

import React from "react";
import ReactMapboxGl, {
    Layer,
    Feature,
    ZoomControl,
    ScaleControl,
    RotationControl,
} from "react-mapbox-gl";
import mapboxToken from "./../config/mapboxToken.js";
import {calcDistance} from "./../helpers/distance";
import {longitude, latitude, mapWidth, mapHeight} from "./../config/variables";
import {Button} from "reactstrap";
import {getRoute} from "./../helpers/mapboxHelper";
import PathButtons from "./../PathButtons";

const Map = ReactMapboxGl({ accessToken: mapboxToken });

export default class Mapbox extends React.Component{
  constructor(props){
    super(props);
    this.state = {
      latitude: latitude,
      longitude: longitude,
      zoom: [15],
      path: [[longitude, latitude], [longitude+0.003, latitude]],
      distance: 0,
      center: [longitude, latitude]
    }
    this.getRoute = getRoute.bind(this)
  }

  updateState = (key, value) => {
    this.setState({[key]: value})
    this.getDistance()
  }

  addMarker = (event, click) => {
    const lng = click.lngLat.lng
    const lat = click.lngLat.lat
    this.getRoute(lng, lat);
//    let pathCopy = this.state.path.slice();
//    pathCopy.push([lng, lat]);
//    this.setState({path: pathCopy})
    this.getDistance()
  }

  updateMarker = (idx, event) => {
    const lng = event.lngLat.lng
    const lat = event.lngLat.lat
    let pathCopy = this.state.path.slice();
    pathCopy[idx] = [lng, lat]
    this.setState({path: pathCopy})
    this.getDistance()
  }

  getDistance = () => {
    let dst = calcDistance(this.state.path)
    this.setState({distance: dst})
  }

  clearPath = () => {
    this.setState({path: [], distance: 0})
  }

  render() {
    return (
      <div>
        <div className="map">
          <Map
            style="mapbox://styles/mapbox/bright-v9"
            containerStyle={{
              height: mapHeight,
              width: mapWidth
            }}
            center={this.state.center}
            zoom={this.state.zoom}
            onClick={(e, c) => this.addMarker(e, c)}
          >
            <Layer type="symbol" id="marker" layout={{"icon-image": "marker-15" }}>
              {this.state.path.map((pos, idx) =>
                <Feature
                  coordinates={pos}
                  key={idx} draggable={true}
                  onDragEnd={(e) => this.updateMarker(idx, e)}
                />
              )}
            </Layer>
            <ZoomControl position={"top-right"}/>
            <ScaleControl position={"bottom-right"}/>
            <RotationControl position={"top-right"}/>
          </Map>
        </div>
        <div className="mapInfo">
          <Button onClick={this.clearPath}>Clear path</Button>
          <Button onClick={this.getDistance}>Calculate Distance</Button>
          <p>
            Distanz: {Math.round(this.state.distance*100)/100} km
          </p>
          <PathButtons updateState={this.updateState} path={this.state.path} switchLatLng={true}/>
        </div>
      </div>
    );
  }
}