npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

ol-supercluster

v0.1.4

Published

OpenLayers's Cluster Source that uses SuperCluster to calculate clusters

Downloads

51

Readme

OpenLayers Super Cluster

This library basically integrates OpenLayers with SuperCluster. The purpose is to allow faster and precise clustering on OpenLayers in a way that's compatible with OpenLayers's Cluster Source, with only a few additional changes. It's composed by just one class, which can be used instead of ol.Source.Cluster, and that receives one additional required parameter: view, which is precisely Map's View.

Installation

The installation of this package is very simple: In fact, it can be installed by just running:

    npm install --save ol-supercluster

If using NodeJS (this installs the package based purely on ES 6), or:

    bower install --save ol-supercluster

If you want to use this package in the browser. You can also use the version provided by a CDN, like JSDelivr. So you can paste the code below on a page and start using ol-supercluster really fast:

<script language="javascript" type="text/javascript" src="https://cdn.jsdelivr.net/npm/ol-supercluster@latest/dist/ol-supercluster.js"></script>

WARNING: Please note that the code above uses always the latest version of ol-supercluster. In production, please replace latest with a valid version number from the Releases page or use NPM to install a fixed version for you. =)

Usage

To use this library, you basically can instance the constructor in a way very similar to how ol/source/Cluster works:

import { Map as OlMap } from "ol";
import { toLonLat } from 'ol/proj';
import { Vector as VectorSource } from 'ol/source';
import SuperCluster from 'ol-supercluster';

const map = new OlMap({
    // Your usual openlayers map here
});

const features = new VectorSource();

const cluster = new SuperCluster({
    source: features, // Required parameter to define the source of the features to pass to SuperCluster
    view: map.getView(), // Required parameter, usually got by `map.getView()`, used to compute some parameters passed into SuperCluster's algorithm
    radius: 60, // Optional parametern to define the  cluster radius, as refered in SuperCluster documentation, the default value is 60
    geoJsonFunction: function(feature) {
        const geometry = feature.getGeometry();
        return {
            "type": "Feature",
            "properties":  null,
            "geometry": {
                "type": "Point",
                "coordinates": toLonLat(geometry.getCoordinates())
            }
        };
    }, // Optional parameter that allows to convert an OpenLayers Feature into a GeoJSON feature whose geometry is a Point, as supported by SuperCluster (for instance, you may get the center of your geometry here, for example)
});

After (or even before) you initialize SuperCluster source, you can just add features with points to your features VectorSource, like that:

import { Feature } from 'ol';
import { Point } from 'ol/geom';
import { fromLonLat } from 'ol/proj';
const longitude = -43.2315809;
const latitude = -22.9139167;
features.addFeature(new Feature(new Point(fromLonLat([longitude, latitude]))))

You can pass the created cluster to any Layer that works with VectorSource, like for instance ol-ext's AnimatedCluster:

import AnimatedCluster from "ol-ext/layer/AnimatedCluster";

const layerCluster = new AnimatedCluster({
    source: cluster,
    // other AnimatedCluster parameters..
});

Or even openlayers's VectorLayer:

import { Vector as VectorLayer } from 'ol/layer';

const layerCluster = new VectorLayer({
    source: cluster,
    // other VectorLayer parameters...
});

Contributing

We still must work on improving documentation, adding tutorial, examples and tests. Feel free to contribute with Pull Requests:

  • [ ] Documentation;
  • [ ] Tutorial;
  • [ ] Examples;
  • [ ] Tests;