React Native Super Cluster

This module wraps AirBnB's react-native-maps and uses MapBox's SuperCluster as clustering engine.

Example

See the showcase application.

Rationale

This module wants to provide a stable and performing solution for maps clustering in React Native. In particular, our efforts are focused on integrating SuperCluster methods into React's state/lifecycle events, ensuring stability, compatibility and great performance.

Install

npm i --save react-native-maps-super-cluster

Usage

NOTES:

• the prop key of the markers rendered through renderMarker should not be left up to React. Instead, we strongly suggest to use an id in order the have unique keys while still taking advantage of React's recycling
• ClusteredMapView supports usual React children. Those children won't be affected by clustering, i.e. the behavior for those children is exactly the same as wrapping them around an AirBnB's react-native-maps instance
• Use onMarkerPress event on MapView instead of using onPress directly on Markers whenever possibile, in particular if you have a lot of pins and clusters. Within onMarkerPress you have access to the marker identifier through the event.nativeEvent attribute, hence you should be able to do everything you would do within an onPress function of a Marker

import React, { Component } from 'react'
import { Marker, Callout } from 'react-native-maps'
import ClusteredMapView from 'react-native-maps-super-cluster'

const INIT_REGION = {
  latitude: 41.8962667,
  longitude: 11.3340056,
  latitudeDelta: 12,
  longitudeDelta: 12
}

export default class MyClusteredMapView extends Component {
  
  ...

  renderCluster = (cluster, onPress) => {
    const pointCount = cluster.pointCount,
          coordinate = cluster.coordinate,
          clusterId = cluster.clusterId

    // use pointCount to calculate cluster size scaling
    // and apply it to "style" prop below

    // eventually get clustered points by using
    // underlying SuperCluster instance
    // Methods ref: https://github.com/mapbox/supercluster
    const clusteringEngine = this.map.getClusteringEngine(),
          clusteredPoints = clusteringEngine.getLeaves(clusterId, 100)

    return (
      <Marker coordinate={coordinate} onPress={onPress}>
        <View style={styles.myClusterStyle}>
          <Text style={styles.myClusterTextStyle}>
            {pointCount}
          </Text>
        </View>
        {
          /*
            Eventually use <Callout /> to
            show clustered point thumbs, i.e.:
            <Callout>
              <ScrollView>
                {
                  clusteredPoints.map(p => (
                    <Image source={p.image}>
                  ))
                }
              </ScrollView>
            </Callout>

            IMPORTANT: be aware that Marker's onPress event isn't really consistent when using Callout.
           */
        }
      </Marker>
    )
  }

  renderMarker = (data) => <Marker key={data.id || Math.random()} coordinate={data.location} />

  ...

  render() {
    return (
      <ClusteredMapView
        style={{flex: 1}}
        data={this.state.data}
        initialRegion={INIT_REGION}
        ref={(r) => { this.map = r }}
        renderMarker={this.renderMarker}
        renderCluster={this.renderCluster} />
    )
  }
}

Props

Name	Type	Required	Default	Note
radius	Number	false	window width * 4,5%	SuperCluster radius.
extent	Number	false	512	SuperCluster extent.
minZoom	Number	false	1	SuperCluster minZoom.
maxZoom	Number	false	16	SuperCluster maxZoom.
width	Number	false	window width	map's width.
height	Number	false	window height	map's height.
data	Array	true	undefined	Objects must have an attribute location representing a GeoPoint, i.e. { latitude: x, longitude: y }.
onExplode	Function	false	undefined	TODO
onImplode	Function	false	undefined	TODO
onClusterPress(clusterId, ?children)	Function	false		Add (or completey override) behaviours to the clusterPress handler. children is passed when default behavior is preserved (see preserveClusterPressBehavior prop).
preserveClusterPressBehavior	Bool	false	true	Whether onClusterPress prop should completely override module's behavior rather than integrate it.
clusterPressMaxChildren	Function	false	100	Max number of cluster leaves returned as second parameter of onClusterPress.
edgePadding	Object	false	{ top: 10, left: 10, bottom: 10, right: 10 }	Edge padding for react-native-maps's fitToCoordinates method, called in onClusterPress for fitting to pressed cluster children.
renderMarker	Function	false	undefined	Must return a react-native-maps' Marker component.
animateClusters	Bool	false	true	Animate imploding/exploding of clusters' markers and clusters size change. Works only on iOS.
layoutAnimationConf	LayoutAnimationConfig	false	LayoutAnimation.Presets.spring	Custom Layout animation configuration object for clusters animation during implode / explode Works only on iOS.
clusteringEnabled	Bool	false	true	Dynamically set whether to pass through clustering functions or immediately render markers as a normal mapview.
accessor	String|Func	true	"location"	Accessor for item coordinate values. Could be a string (field name of an item object with latitude and longitude values) or a function (that describes how to access to coordinate data).

Methods

Name	Params	Description	Note
getMapRef	none	Getter for underlying react-native-maps instance	Official Doc
getClusteringEngine	none	Getter for underlying SuperCluster instance	Official Doc

Production usage

If you are using this module in a production application, please submit a PR or contact us to add it here.

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TODO

features

• improve scaleUpRatio math for fontSize
• trigger events on cluster implode/explode

Support

As an open source project, we provide free support over Github. However, our daily job may increase response time to days or even weeks. If you need dedicated support, feel free to contact us for a quote.

Contributors

• Leonardo Lusoli
• Alberto Dallaporta

License

See our License for more information.