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<!-- BANNER_TPL_BEGIN --> s2-geometry.js
=====
About Daplie: We're taking back the Internet! Moved to https://git.daplie.com/Daplie/s2-geometry.js
--------------
Down with Google, Apple, and Facebook!
We're re-decentralizing the web and making it read-write again - one home cloud system at a time.
Tired of serving the Empire? Come join the Rebel Alliance:
<a href="mailto:jobs@daplie.com">jobs@daplie.com</a> | [Invest in Daplie on Wefunder](https://daplie.com/invest/) | [Pre-order Cloud](https://daplie.com/preorder/), The World's First Home Server for Everyone
<!-- BANNER_TPL_END -->
s2-geometry (JavaScript/ES5.1)
======================
A pure JavaScript/ES5.1 port of Google/Niantic's S2 Geometry library (as used by **Ingress**, **Pokemon GO**)
Currently contains basic support for S2Cell
<table>
<tr>
<td></td>
<td>
Face 2
<br>
Orientation A
<a href="http://i.imgur.com/SODO4bT.jpg" target="_face2"><img src="http://i.imgur.com/SODO4bTt.jpg" title="Face 2" alt="Face 2"></a>
<br>
The North Pole<br>(and Canada / Europe)
</td>
<td></td>
</tr>
<tr>
<td>
Face 0
<br>
Orientation A
<a href="http://i.imgur.com/dLI5Zd1.jpg" target="_face0"><img src="http://i.imgur.com/dLI5Zd1t.jpg" title="Face 0" alt="Face 0"></a>
<br>
Africa
</td>
<td>
Face 1
<br>
Orientation D
<a href="http://i.imgur.com/duTLDTV.jpg" target="_face1"><img src="http://i.imgur.com/duTLDTVt.jpg" title="Face 1" alt="Face 1"></a>
<br>
Asia
</td>
<td>
Face 3
<br>
Orientation D
<a href="http://i.imgur.com/6Ho35Tc.jpg" target="_face3"><img src="http://i.imgur.com/6Ho35Tct.jpg" title="Face 3" alt="Face 3"></a>
<br>
Nothing<br>(and Australia)
</td>
<td>
Face 4
<br>
Orientation A
<a href="http://i.imgur.com/3IBAfqj.jpg" target="_face4"><img src="http://i.imgur.com/3IBAfqjt.jpg" title="Face 4" alt="Face 4"></a>
<br>
The Americas<br>(and Provo, UT)
</td>
</tr>
<tr>
<td></td>
<td></td>
<td></td>
<td>
Face 5
<br>
Orientation D
<a href="http://i.imgur.com/HZCBvgy.jpg" target="_face5"><img src="http://i.imgur.com/HZCBvgyt.jpg" title="Face 5" alt="Face 5"></a>
<br>
Antarctica
</td>
</tr>
</table>
Where is this being used?
---------------------
* [pokemap-webapp](https://github.com/Daplie/pokemap-webapp)
* [node-pokemap](https://github.com/Daplie/node-pokemap)
* [Pokemon-GO-node-api](https://github.com/Daplie/Pokemon-GO-node-api)
Simple Examples
---------------
```javascript
'use strict';
var S2 = require('s2-geometry').S2;
var lat = 40.2574448;
var lng = -111.7089464;
var level = 15;
//
// Convert from Lat / Lng
//
var key = S2.latLngToKey(lat, lng, level);
// '4/032212303102210'
//
// Convert between Hilbert Curve Quadtree Key and S2 Cell Id
//
var id = S2.keyToId(key);
// '9749618446378729472'
var key = S2.idToKey(id);
// '9749618446378729472'
//
// Convert between Quadkey and Id
//
var latlng = S2.keyToLatLng(key);
var latlng = S2.idToLatLng(id);
//
// Neighbors
//
var neighbors = S2.latLngToNeighborKeys(lat, lng, level);
// [ keyLeft, keyDown, keyRight, keyUp ]
//
// Previous, Next, and Step
//
var nextKey = S2.nextKey(key);
var prevKey = S2.prevKey(key);
var backTenKeys = S2.stepKey(key, -10);
```
Previous and Next
-----------------
You can get the previous and next S2CellId from any given Key:
1. Convert from Lat/Lng to Key (Face and Hilbert Curve Quadtree)
2. Get the Previous or Next Key
3. Convert the Key to an Id (uint64 string)
```javascript
var key = S2.latLngToKey(40.2574448, -111.7089464, 15); // '4/032212303102210'
var id = S2.keyToId(key); // '9749618446378729472'
var nextKey = S2.nextKey(key);
var nextId = S2.keyToId(nextKey);
var prevKey = S2.prevKey(key);
var prevId = S2.keyToId(prevKey);
var backTenKeys = S2.stepKey(key, -10);
// See it
console.log(prevKey); // '4/032212303102203'
console.log(key); // '4/032212303102210'
console.log(nextKey); // '4/032212303102211'
console.log(nextId);
```
convert Cell Id to Hilbert Curve Quad Tree
------------------
Convert from base 10 (decimal) `S2 Cell Id` to base 4 `quadkey` (aka hilbert curve quadtree id)
Example '4/032212303102210' becomes '9749618446378729472'
```javascript
'use strict';
var quadkey = '4/032212303102210'
var parts = quadkey.split('/');
var face = parts[0]; // 4
var position = parts[1]; // '032212303102210';
var level = '032212303102210'.length; // 15
var cellId = S2.facePosLevelToId(face, position, level);
console.log(cellId);
```
Convert from hilbert quadtree id to s2 cell id:
Example '9749618446378729472' becomes '4/032212303102210'
```javascript
'use strict';
var cellId = '9749618446378729472';
var hilbertQuadkey = S2.idToKey(cellId);
console.log(hilbertQuadkey);
```
Convert Key and Id to LatLng
---------------------
```javascript
var latlng = S2.keyToLatLng('4/032212303102210');
var latlng = S2.idToLatLng('9749618446378729472');
```