supercluster 1.0.7

A very fast Rust crate for geospatial point clustering
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# Supercluster

A very fast Rust crate for geospatial point clustering.

This crate is deeply inspired by Mapbox's supercluster [JS package](https://www.npmjs.com/package/supercluster) and [blog post](https://www.mapbox.com/blog/supercluster/).

## Reference implementation

[![test](https://github.com/chargetrip/supercluster-rust/actions/workflows/test.yml/badge.svg)](https://github.com/chargetrip/supercluster-rust/actions/workflows/test.yml)
[![docs](https://docs.rs/supercluster/badge.svg)](https://docs.rs/supercluster)
[![crate](https://img.shields.io/crates/v/supercluster.svg)](https://crates.io/crates/supercluster)
![Crates.io (recent)](https://img.shields.io/crates/dr/supercluster)
![GitHub](https://img.shields.io/github/license/chargetrip/supercluster-rust)

![Features](https://cloud.githubusercontent.com/assets/25395/11857351/43407b46-a40c-11e5-8662-e99ab1cd2cb7.gif)

## Features

- `load(points)`: Loads an array of [GeoJSON Feature](https://tools.ietf.org/html/rfc7946#section-3.2) objects. Each feature's `geometry` must be a [GeoJSON Point](https://tools.ietf.org/html/rfc7946#section-3.1.2).

- `get_clusters(bbox, zoom)`: For the given `bbox` array (`[west_lng, south_lat, east_lng, north_lat]`) and `zoom`, returns an array of clusters and points as [GeoJSON Feature](https://tools.ietf.org/html/rfc7946#section-3.2) objects.

- `get_tile(z, x, y)`: For a given zoom and x/y coordinates, returns a [geojson-vt](https://github.com/mapbox/geojson-vt)-compatible JSON tile object with cluster/point features.

- `get_children(cluster_id)`: Returns the children of a cluster (on the next zoom level) given its id (`cluster_id` value from feature properties).

- `get_leaves(cluster_id, limit, offset)`: Returns all the points of a cluster (given its `cluster_id`), with pagination support.

- `get_cluster_expansion_zoom(cluster_id)`: Returns the zoom on which the cluster expands into several children (useful for "click to zoom" feature) given the cluster's `cluster_id`.

## Options

| Option       | Description                                                       |
|--------------|-------------------------------------------------------------------|
| `min_zoom`   | Minimum zoom level at which clusters are generated.               |
| `max_zoom`   | Maximum zoom level at which clusters are generated.               |
| `min_points` | Minimum number of points to form a cluster.                       |
| `radius`     | Cluster radius, in pixels.                                        |
| `extent`     | (Tiles) Tile extent. Radius is calculated relative to this value. |
| `node_size`  | Size of the KD-tree leaf node. Affects performance.               |

## Safety

This crate uses `#![forbid(unsafe_code)]` to ensure everything is implemented in
100% safe Rust.

## Usage

Run the following Cargo command in your project directory:

```bash
cargo add supercluster
```

```rust
extern crate supercluster;

use supercluster::{ Supercluster, Options };

fn main() {
  let options = Options {
      max_zoom: 16,
      min_zoom: 0,
      min_points: 2,
      radius: 40.0,
      node_size: 64,
      extent: 512.0,
  };

  // Create a new instance with the specified configuration settings
  let mut cluster = Supercluster::new(options);

  // Load the input GeoJSON points into the Supercluster instance
  let points = Vec::new(); // your points
  let index = cluster.load(points);

  // Retrieve a vector of features within a tile at the given zoom level and tile coordinates
  let tile = index.get_tile(0, 0.0, 0.0).expect("cannot get a tile");

  ...
}
```

## Contributing

Build:

```bash
cargo build
```

Test:

```bash
cargo test
```

Run [clippy](https://github.com/rust-lang/rust-clippy):

```bash
cargo clippy --all-targets --all-features -- -D warnings
```

Generate documentation in HTML format:

```bash
cargo doc --open
```

## Sponsors

[![Chargetrip logo](https://chargetrip-files.s3.eu-central-1.amazonaws.com/logo-1.png)](https://www.chargetrip.com)