This commit is contained in:
AJ ONeal 2016-07-26 00:42:53 -04:00
parent 54fccf662e
commit 544fc8a48d
6 changed files with 107 additions and 44 deletions

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AUTHORS Normal file
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Jon Atkins <github@jonatkins.com> (http://www.jonatkins.com/)
AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com)

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LICENSE Normal file
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ISC License (ISC)
Copyright (c) 2012-2016, Jon Atkins <github@jonatkins.com>
Copyright (c) 2016, AJ ONeal <coolaj86@gmail.com>
Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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s2-geometry-javascript s2-geometry (JavaScript/ES5.1)
====================== ======================
Porting Google's S2 Geometry Library to Javascript A pure JavaScript/ES5.1 port of Google/Niantic's S2 Geometry library (used by Ingress, Pokemon GO)
Currently contains basic support for S2Cell Currently contains basic support for S2Cell
More details and examples to come later. Simple Examples
---------------
What you need to know for Pokemon GO clients:
```javascript ```javascript
var cell = S2.S2Cell.FromLatLng({ lat: 40.2574448, lng: -111.7089464 }, 15); var level = 15;
var latlng = { lat: 40.2574448, lng: -111.7089464 };
var cell = S2.S2Cell.FromLatLng(latlng, level);
cell.getNeighbors(); // [ cellLeft, cellDown, cellRight, cellUp ] cell.getNeighbors(); // [ cellLeft, cellDown, cellRight, cellUp ]

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package.json Normal file
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{
"name": "s2-geometry",
"version": "1.0.0",
"description": "A pure JavaScript/ES5.1 port of Google/Niantic's S2 Geometry library (used by Ingress, Pokemon GO)",
"main": "src/s2geometry.js",
"scripts": {
"test": "node tests/cellid.js"
},
"repository": {
"type": "git",
"url": "git+https://github.com/coolaj86/s2-geometry-javascript.git"
},
"keywords": [
"s2",
"geometry",
"s2geometry",
"Niantic",
"Ingress",
"Pokemon",
"GO",
"PokemonGO",
"cellid",
"s2cell",
"s2cellid",
"latitude",
"longitude",
"lat",
"lng"
],
"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
"license": "ISC",
"bugs": {
"url": "https://github.com/coolaj86/s2-geometry-javascript/issues"
},
"homepage": "https://github.com/coolaj86/s2-geometry-javascript#readme"
}

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// - i,j: they always use 30 bits, adjusting as needed. we use 0 to (1<<level)-1 instead // - i,j: they always use 30 bits, adjusting as needed. we use 0 to (1<<level)-1 instead
// (so GetSizeIJ for a cell is always 1) // (so GetSizeIJ for a cell is always 1)
(function() { (function(exports) {
'use strict'; 'use strict';
window.S2 = {}; var S2 = exports.S2 = {};
var LatLngToXYZ = function(latLng) { var LatLngToXYZ = function(latLng) {
var d2r = S2.L.LatLng.DEG_TO_RAD; var d2r = S2.L.LatLng.DEG_TO_RAD;
@ -76,11 +76,11 @@ var faceXYZToUV = function(face,xyz) {
case 3: u = xyz[2]/xyz[0]; v = xyz[1]/xyz[0]; break; case 3: u = xyz[2]/xyz[0]; v = xyz[1]/xyz[0]; break;
case 4: u = xyz[2]/xyz[1]; v = -xyz[0]/xyz[1]; break; case 4: u = xyz[2]/xyz[1]; v = -xyz[0]/xyz[1]; break;
case 5: u = -xyz[1]/xyz[2]; v = -xyz[0]/xyz[2]; break; case 5: u = -xyz[1]/xyz[2]; v = -xyz[0]/xyz[2]; break;
default: throw {error: 'Invalid face'}; break; default: throw {error: 'Invalid face'};
} }
return [u,v]; return [u,v];
} };
@ -112,30 +112,27 @@ var FaceUVToXYZ = function(face,uv) {
} }
}; };
var singleSTtoUV = function(st) {
var STToUV = function(st) {
var singleSTtoUV = function(st) {
if (st >= 0.5) { if (st >= 0.5) {
return (1/3.0) * (4*st*st - 1); return (1/3.0) * (4*st*st - 1);
} else { } else {
return (1/3.0) * (1 - (4*(1-st)*(1-st))); return (1/3.0) * (1 - (4*(1-st)*(1-st)));
} }
} };
var STToUV = function(st) {
return [singleSTtoUV(st[0]), singleSTtoUV(st[1])]; return [singleSTtoUV(st[0]), singleSTtoUV(st[1])];
}; };
var singleUVtoST = function(uv) {
var UVToST = function(uv) {
var singleUVtoST = function(uv) {
if (uv >= 0) { if (uv >= 0) {
return 0.5 * Math.sqrt (1 + 3*uv); return 0.5 * Math.sqrt (1 + 3*uv);
} else { } else {
return 1 - 0.5 * Math.sqrt (1 - 3*uv); return 1 - 0.5 * Math.sqrt (1 - 3*uv);
} }
} };
var UVToST = function(uv) {
return [singleUVtoST(uv[0]), singleUVtoST(uv[1])]; return [singleUVtoST(uv[0]), singleUVtoST(uv[1])];
}; };
@ -159,7 +156,7 @@ var IJToST = function(ij,order,offsets) {
(ij[0]+offsets[0])/maxSize, (ij[0]+offsets[0])/maxSize,
(ij[1]+offsets[1])/maxSize (ij[1]+offsets[1])/maxSize
]; ];
} };
// hilbert space-filling curve // hilbert space-filling curve
// based on http://blog.notdot.net/2009/11/Damn-Cool-Algorithms-Spatial-indexing-with-Quadtrees-and-Hilbert-Curves // based on http://blog.notdot.net/2009/11/Damn-Cool-Algorithms-Spatial-indexing-with-Quadtrees-and-Hilbert-Curves
@ -212,8 +209,6 @@ S2.S2Cell.FromLatLng = function(latLng,level) {
var ij = STToIJ(st,level); var ij = STToIJ(st,level);
return S2.S2Cell.FromFaceIJ (faceuv[0], ij, level); return S2.S2Cell.FromFaceIJ (faceuv[0], ij, level);
return result;
}; };
S2.S2Cell.FromFaceIJ = function(face,ij,level) { S2.S2Cell.FromFaceIJ = function(face,ij,level) {
@ -304,14 +299,20 @@ S2.S2Cell.prototype.getNeighbors = function() {
}; };
})(); })('undefined' !== typeof window ? window : module.exports);
(function () { (function (exports) {
'use strict'; 'use strict';
// Adapted from Leafletjs https://searchcode.com/codesearch/view/42525008/ // Adapted from Leafletjs https://searchcode.com/codesearch/view/42525008/
var L = {}; var L = {};
var S2 = exports.S2;
if (!exports.L) {
exports.L = L;
}
S2.L = L;
L.LatLng = function (/*Number*/ rawLat, /*Number*/ rawLng, /*Boolean*/ noWrap) { L.LatLng = function (/*Number*/ rawLat, /*Number*/ rawLng, /*Boolean*/ noWrap) {
var lat = parseFloat(rawLat, 10); var lat = parseFloat(rawLat, 10);
@ -331,9 +332,4 @@ S2.S2Cell.prototype.getNeighbors = function() {
L.LatLng.DEG_TO_RAD = Math.PI / 180; L.LatLng.DEG_TO_RAD = Math.PI / 180;
L.LatLng.RAD_TO_DEG = 180 / Math.PI; L.LatLng.RAD_TO_DEG = 180 / Math.PI;
})('undefined' !== typeof window ? window : module.exports);
if (!window.L) {
window.L = L;
}
S2.L = L;
})();

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tests/cellid.js Normal file
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'use strict';
var S2 = require('../src/s2geometry.js').S2;
var level = 15;
var latlng = { lat: 40.2574448, lng: -111.7089464 };
var cell = S2.S2Cell.FromLatLng(latlng, level);
cell.getNeighbors(); // [ cellLeft, cellDown, cellRight, cellUp ]
latlng = cell.getLatLng(); // { lat: 40.2574448, lng: -111.7089464 }
if (40 === Math.round(latlng.lat) && -112 === Math.round(latlng.lng)) {
console.log('OK');
process.exit(0);
}
else {
console.log('[ERROR] latitude and longitude were not the expected values:');
console.log(latlng);
process.exit(1);
}