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_Breaking changes, which may affect downstream projects are marked with a_ :warning:
## 3.1.0
##### 2018-Jul-12
* Replace legacy Rollup `jsnext:main` with now standard `module` ([#74])
* :warning: Drop support for Node 4
[#74]: https://github.com/mapbox/whoots-js/issues/74
## 3.0.0
##### 2017-Feb-13
* :warning: whoots-js is now a scoped package under the @mapbox namespace
## 2.1.0
##### Jul 15, 2016
* Release as ES6 module alongside UMD build, add `jsnext:main` to `package.json`
## 2.0.0
##### Jun 1, 2016
* :warning: Refactor for a classless API
## 1.1.0
##### May 23, 2016
* Make getTileBbox and getMercCoords public
## 1.0.0
##### May 23, 2016
* Initial release

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ISC License
Copyright (c) 2017, Mapbox
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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[![npm version](https://badge.fury.io/js/%40mapbox%2Fwhoots-js.svg)](https://badge.fury.io/js/%40mapbox%2Fwhoots-js)
[![Build Status](https://secure.travis-ci.org/mapbox/whoots-js.svg)](http://travis-ci.org/mapbox/whoots-js)
[![Coverage Status](https://coveralls.io/repos/github/mapbox/whoots-js/badge.svg?branch=master)](https://coveralls.io/github/mapbox/whoots-js?branch=master)
## whoots-js
Request tiles from WMS servers that support EPSG:3857.
This project is a JavaScript port of https://github.com/timwaters/whoots by Tim Waters.
### What is it?
Given a `z/x/y` tile coordinate like `19/154308/197167`, `whoots-js` can request imagery from an EPSG:3857 supporting WMS server like this:
```
http://geodata.state.nj.us/imagerywms/Natural2015?
bbox=-8242663.382160267,4966572.349857613,-8242586.945131982,4966648.786885899
&format=image/png&service=WMS&version=1.1.1&request=GetMap&srs=EPSG:3857
&width=256&height=256&layers=Natural2015
```
### Usage
```js
var WhooTS = require('@mapbox/whoots-js');
// Get an image url for a given tile coordinate
var baseUrl = 'http://geodata.state.nj.us/imagerywms/Natural2015';
var layer = 'Natural2015';
var url = WhooTS.getURL(baseUrl, layer, 154308, 197167, 19);
```
### Server
This project includes a sample redirecting wms proxy server in `server.js`.
`npm run server` will start a local server on port 8080 that redirects tile requests.
Valid tile requests look like:
```
http://localhost:8080/tms/{z}/{x}/{y}/{layer}/{endpoint}
http://localhost:8080/tms/19/154308/197167/Natural2015/http://geodata.state.nj.us/imagerywms/Natural2015
```
### Documentation
Complete API documentation is here: http://mapbox.github.io/whoots-js/

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(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.WhooTS = {})));
}(this, (function (exports) {
/**
* getURL
*
* @param {String} baseUrl Base url of the WMS server
* @param {String} layer Layer name
* @param {Number} x Tile coordinate x
* @param {Number} y Tile coordinate y
* @param {Number} z Tile zoom
* @param {Object} [options]
* @param {String} [options.format='image/png']
* @param {String} [options.service='WMS']
* @param {String} [options.version='1.1.1']
* @param {String} [options.request='GetMap']
* @param {String} [options.srs='EPSG:3857']
* @param {Number} [options.width='256']
* @param {Number} [options.height='256']
* @returns {String} url
* @example
* var baseUrl = 'http://geodata.state.nj.us/imagerywms/Natural2015';
* var layer = 'Natural2015';
* var url = whoots.getURL(baseUrl, layer, 154308, 197167, 19);
*/
function getURL(baseUrl, layer, x, y, z, options) {
options = options || {};
var url = baseUrl + '?' + [
'bbox=' + getTileBBox(x, y, z),
'format=' + (options.format || 'image/png'),
'service=' + (options.service || 'WMS'),
'version=' + (options.version || '1.1.1'),
'request=' + (options.request || 'GetMap'),
'srs=' + (options.srs || 'EPSG:3857'),
'width=' + (options.width || 256),
'height=' + (options.height || 256),
'layers=' + layer
].join('&');
return url;
}
/**
* getTileBBox
*
* @param {Number} x Tile coordinate x
* @param {Number} y Tile coordinate y
* @param {Number} z Tile zoom
* @returns {String} String of the bounding box
*/
function getTileBBox(x, y, z) {
// for Google/OSM tile scheme we need to alter the y
y = (Math.pow(2, z) - y - 1);
var min = getMercCoords(x * 256, y * 256, z),
max = getMercCoords((x + 1) * 256, (y + 1) * 256, z);
return min[0] + ',' + min[1] + ',' + max[0] + ',' + max[1];
}
/**
* getMercCoords
*
* @param {Number} x Pixel coordinate x
* @param {Number} y Pixel coordinate y
* @param {Number} z Tile zoom
* @returns {Array} [x, y]
*/
function getMercCoords(x, y, z) {
var resolution = (2 * Math.PI * 6378137 / 256) / Math.pow(2, z),
merc_x = (x * resolution - 2 * Math.PI * 6378137 / 2.0),
merc_y = (y * resolution - 2 * Math.PI * 6378137 / 2.0);
return [merc_x, merc_y];
}
exports.getURL = getURL;
exports.getTileBBox = getTileBBox;
exports.getMercCoords = getMercCoords;
Object.defineProperty(exports, '__esModule', { value: true });
})));

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export { getURL, getTileBBox, getMercCoords };
/**
* getURL
*
* @param {String} baseUrl Base url of the WMS server
* @param {String} layer Layer name
* @param {Number} x Tile coordinate x
* @param {Number} y Tile coordinate y
* @param {Number} z Tile zoom
* @param {Object} [options]
* @param {String} [options.format='image/png']
* @param {String} [options.service='WMS']
* @param {String} [options.version='1.1.1']
* @param {String} [options.request='GetMap']
* @param {String} [options.srs='EPSG:3857']
* @param {Number} [options.width='256']
* @param {Number} [options.height='256']
* @returns {String} url
* @example
* var baseUrl = 'http://geodata.state.nj.us/imagerywms/Natural2015';
* var layer = 'Natural2015';
* var url = whoots.getURL(baseUrl, layer, 154308, 197167, 19);
*/
function getURL(baseUrl, layer, x, y, z, options) {
options = options || {};
var url = baseUrl + '?' + [
'bbox=' + getTileBBox(x, y, z),
'format=' + (options.format || 'image/png'),
'service=' + (options.service || 'WMS'),
'version=' + (options.version || '1.1.1'),
'request=' + (options.request || 'GetMap'),
'srs=' + (options.srs || 'EPSG:3857'),
'width=' + (options.width || 256),
'height=' + (options.height || 256),
'layers=' + layer
].join('&');
return url;
}
/**
* getTileBBox
*
* @param {Number} x Tile coordinate x
* @param {Number} y Tile coordinate y
* @param {Number} z Tile zoom
* @returns {String} String of the bounding box
*/
function getTileBBox(x, y, z) {
// for Google/OSM tile scheme we need to alter the y
y = (Math.pow(2, z) - y - 1);
var min = getMercCoords(x * 256, y * 256, z),
max = getMercCoords((x + 1) * 256, (y + 1) * 256, z);
return min[0] + ',' + min[1] + ',' + max[0] + ',' + max[1];
}
/**
* getMercCoords
*
* @param {Number} x Pixel coordinate x
* @param {Number} y Pixel coordinate y
* @param {Number} z Tile zoom
* @returns {Array} [x, y]
*/
function getMercCoords(x, y, z) {
var resolution = (2 * Math.PI * 6378137 / 256) / Math.pow(2, z),
merc_x = (x * resolution - 2 * Math.PI * 6378137 / 2.0),
merc_y = (y * resolution - 2 * Math.PI * 6378137 / 2.0);
return [merc_x, merc_y];
}

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{
"name": "@mapbox/whoots-js",
"description": "Request tiles from WMS servers that support EPSG:3857",
"version": "3.1.0",
"main": "index.js",
"module": "index.mjs",
"license": "ISC",
"author": "Bryan Housel <bryan@mapbox.com>",
"repository": "mapbox/whoots-js",
"keywords": [
"WMS",
"tiles",
"EPSG:3857"
],
"dependencies": {},
"devDependencies": {
"coveralls": "^3.0.0",
"documentation": "4.0.0-beta5",
"eslint": "^5.0.0",
"rollup": "0.60.0",
"tap": "^12.0.0"
},
"engines": {
"node": ">=6.0.0"
},
"scripts": {
"build": "rollup -f umd -n WhooTS index.mjs --no-indent --no-strict -o index.js",
"docs": "documentation build index.mjs --lint --github --format html --output docs/",
"lint": "eslint index.mjs server.js test",
"start": "node server.js",
"test": "npm run lint && npm run build && tap --cov test/*.js"
}
}

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'use strict';
var WhooTS = require('./');
var http = require('http');
var url = require('url');
var PORT = 8080;
// valid requests look like:
// http://localhost:8080/tms/{z}/{x}/{y}/{layer}/{baseUrl}
// http://localhost:8080/tms/19/154308/197167/Natural2015/http://geodata.state.nj.us/imagerywms/Natural2015
function handleRequest(request, response) {
var pathname = url.parse(request.url, true).pathname;
var params = pathname.split('/');
if (params.length > 6 && params[1].toLowerCase() === 'tms') {
var z = +params[2],
x = +params[3],
y = +params[4],
layer = params[5],
baseUrl = pathname.replace(params.slice(0,6).join('/') + '/', '');
if (!isNaN(z) && !isNaN(x) && !isNaN(y) && layer && url.parse(baseUrl).protocol) {
response.writeHead(302, { 'Location': WhooTS.getURL(baseUrl, layer, x, y, z) });
response.end('Redirect');
return;
}
}
response.statusCode = '404';
response.end('Not Found');
}
var server = http.createServer(handleRequest);
server.listen(PORT, function() {
/* eslint-disable no-console */
console.log('Server listening on: http://localhost:%s', PORT);
/* eslint-enable no-console */
});