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react-leaflet-heatmap-layer
Advanced tools
Readme
react-leaflet-heatmap-layer
provides a simple <HeatmapLayer />
component for creating a heatmap layer in a react-leaflet
map.
Use directly as a fixed layer:
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='© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
/>
</Map>
</div>
);
}
}
render(<MapExample />, document.getElementById('app'));
Or use it inside a layer control to toggle it:
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={position} zoom={13} style={{ height: '100%' }} >
<LayersControl>
<LayersControl.BaseLayer name="Base" checked>
<TileLayer
url="http://{s}.tile.osm.org/{z}/{x}/{y}.png"
attribution="© <a href=http://osm.org/copyright>OpenStreetMap</a> contributors"
/>
</LayersControl.BaseLayer>
<LayersControl.Overlay name="Heatmap" checked>
<FeatureGroup color="purple">
<Marker position={[50.05, -0.09]} >
<Popup>
<span>A pretty CSS3 popup.<br /> Easily customizable. </span>
</Popup>
</Marker>
<HeatmapLayer
fitBoundsOnLoad
fitBoundsOnUpdate
points={addressPoints}
longitudeExtractor={m => m[1]}
latitudeExtractor={m => m[0]}
intensityExtractor={m => parseFloat(m[2])}
/>
</FeatureGroup>
</LayersControl.Overlay>
<LayersControl.Overlay name="Marker">
<FeatureGroup color="purple">
<Marker position={position} >
<Popup>
<span>A pretty CSS3 popup.<br /> Easily customizable. </span>
</Popup>
</Marker>
</FeatureGroup>
</LayersControl.Overlay>
</LayersControl>
</Map>
</div>
);
}
}
render(<MapExample />, document.getElementById('app'));
The HeatmapLayer
component takes the following props:
points
: required an array of objects to be processedlongitudeExtractor
: 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 loadfitBoundsOnUpdate
: boolean indicating whether map should fit data in bounds of map on Updatemax
: 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 coordinateTo try the example:
npm install
in the root of your cloned repositorynpm run example
See CONTRIBUTING.md
This package was inspired by Leaflet.heat.
react-leaflet-heatmap-layer
is MIT licensed.
See LICENSE.md for details.
FAQs
A custom layer for heatmaps in react-leaflet
The npm package react-leaflet-heatmap-layer receives a total of 1,923 weekly downloads. As such, react-leaflet-heatmap-layer popularity was classified as popular.
We found that react-leaflet-heatmap-layer demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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