react-leaflet-heatmap-layer

react-leaflet-heatmap-layer

react-leaflet-heatmap-layer provides a simple <HeatmapLayer /> component for creating a heatmap layer in a react-leaflet map.

Usage

import React from 'react';
import { render } from 'react-dom';
import { Map, Marker, Popup, TileLayer } from 'react-leaflet';
import HeatmapLayer from '../src/HeatmapLayer';
import { addressPoints } from './realworld.10000.js';

class MapExample extends React.Component {

  render() {
    return (
      <div>
        <Map center={[0,0]} zoom={13}>
          <HeatmapLayer
            fitBoundsOnLoad
            fitBoundsOnUpdate
            points={addressPoints}
            longitudeExtractor={m => m[1]}
            latitudeExtractor={m => m[0]}
            intensityExtractor={m => parseFloat(m[2])} />
          <TileLayer
            url='http://{s}.tile.osm.org/{z}/{x}/{y}.png'
            attribution='&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
          />
        </Map>
      </div>
    );
  }

}

render(<MapExample />, document.getElementById('app'));

API

The HeatmapLayer component takes the following props:

• points: required an array of objects to be processed
• longitudeExtractor: required a function that returns the object's longitude e.g. marker => marker.lng
• latitudeExtractor: required a function that returns the object's latitude e.g. marker => marker.lat
• intensityExtractor: required a function that returns the object's intensity e.g. marker => marker.val
• fitBoundsOnLoad: boolean indicating whether map should fit data in bounds of map on load
• fitBoundsOnUpdate: boolean indicating whether map should fit data in bounds of map on Update
• max: max intensity value for heatmap (default: 3.0)
• radius: radius for heatmap points (default: 30)
• maxZoom: maximum zoom for heatmap (default: 18)
• minOpacity: minimum opacity for heatmap (default: 0.01)
• blur: blur for heatmap points (default: 15)
• gradient: object defining gradient stop points for heatmap e.g. { 0.4: 'blue', 0.8: 'orange', 1.0: 'red' } (default: simpleheat package default gradient)
• onStatsUpdate: called on redraw with a { min, max } object containing the min and max number of items found for a single coordinate

Example

To try the example:

• Clone this repository
• run npm install in the root of your cloned repository
• run npm run example
• Visit localhost:8000

Contributing

See CONTRIBUTING.md

Credits

This package was inspired by Leaflet.heat.

License

react-leaflet-heatmap-layer is MIT licensed.

See LICENSE.md for details.