├── .gitignore ├── .npmignore ├── .travis.yml ├── LICENSE ├── README.md ├── changelog.md ├── index.js ├── package-lock.json ├── package.json └── test ├── expected ├── bbox.1024.png ├── bbox.256.png ├── bbox.512.png ├── center.1024.png ├── center.256.png ├── center.512.png ├── expected.1024.png ├── expected.256.png └── expected.512.png ├── fixtures ├── 1.0.0.1024.png ├── 1.0.0.256.png ├── 1.0.0.512.png ├── 1.0.1.1024.png ├── 1.0.1.256.png ├── 1.0.1.512.png ├── 1.1.0.1024.png ├── 1.1.0.256.png ├── 1.1.0.512.png ├── 1.1.1.1024.png ├── 1.1.1.256.png └── 1.1.1.512.png ├── outputs ├── bbox.1024.png ├── bbox.256.png ├── bbox.512.png ├── center.1024.png ├── center.256.png ├── center.512.png ├── expected.1024.png ├── expected.256.png └── expected.512.png └── test.js /.gitignore: -------------------------------------------------------------------------------- 1 | map_test 2 | .DS_Store 3 | node_modules 4 | -------------------------------------------------------------------------------- /.npmignore: -------------------------------------------------------------------------------- 1 | /test 2 | /node_modules 3 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: node_js 2 | 3 | node_js: 4 | - "6.17.1" 5 | - "8.16.0" 6 | - "10.16.0" 7 | 8 | sudo: false 9 | 10 | addons: 11 | apt: 12 | sources: 13 | - ubuntu-toolchain-r-test 14 | packages: 15 | - libstdc++6 # upgrade libstdc++ on linux to support C++11 16 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Copyright (c) 2016, Mapbox 2 | 3 | Permission to use, copy, modify, and/or distribute this software for any 4 | purpose with or without fee is hereby granted, provided that the above 5 | copyright notice and this permission notice appear in all copies. 6 | 7 | THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8 | WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 | MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 10 | ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 12 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 13 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 14 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## abaculus 2 | a small block of stone, tile, glass, or other material used in the construction of a mosaic 3 | 4 | or, 5 | 6 | a library for creating static maps from tiles based on center or corner lng,lat coordinates. 7 | Uses node-mapnik to stitch tiles together. 8 | 9 | [![Build Status](https://travis-ci.org/mapbox/abaculus.svg?branch=master)](https://travis-ci.org/mapbox/abaculus) 10 | 11 | 12 | Looking to create high res images of maps? Abaculus was written for use in [Mapbox Studio](http://github.com/mapbox/mapbox-studio) and you can use Mapbox Studio to create and export high resolution images -- see [https://www.mapbox.com/guides/print/](https://www.mapbox.com/guides/print/) for more information. You can even use [that utility from the command line](https://github.com/mapbox/mapbox-studio/issues/1024#issuecomment-63535433). 13 | 14 | ### usage 15 | 16 | Usage and example formatting below, or see the [tests](https://github.com/mapbox/abaculus/blob/master/test/test.js#L158-L204) for a more robust example with a `getTile` function. 17 | 18 | #### input: 19 | `scale`: integer between 1-4 and sets resolution (`scale: 1` is 72dpi, `scale: 4`, is 288dpi) 20 | 21 | `zoom`: zoom level 22 | 23 | `[w, s, e, n]`: the bounding box for the west (lat val), south (lng val), east (lat val), north (lng val) for the desired area 24 | 25 | `x`: longitude coordinate 26 | 27 | `y`: latitude coordinate 28 | 29 | `width` and `height`: desired pixel bounds for a map with a center coordinate. Will be multiplied by scale to maintain resolution. 30 | 31 | `format` (optional): `png` or `jpeg`, default is `png`. 32 | 33 | `quality` (optional): when used with `jpeg` format, accepts 1-100 and defaults to 80. when used with `png` format, accepts 2-256 (# of colors to reduce the image to) and defaults to none. 34 | 35 | `tileSize` (optional, defaults to `256`): Specifies input size of tiles used in `getTile` function. 36 | 37 | `getTile`: a function that returns a tile buffer (png or otherwise) and headers given `z`, `x`, `y`, and a callback, such as from [tilelive-vector](https://github.com/mapbox/tilelive-vector/blob/master/index.js#L119-L218) or this [test function](https://github.com/mapbox/abaculus/blob/master/test/test.js#L184-L204). 38 | 39 | `limit` (optional): max width or height of generated image in pixels. Default is `19008`. 40 | 41 | ```javascript 42 | // Calculate image bounds from W,S,E,N bounding box. 43 | var params = { 44 | zoom: {zoom}, 45 | scale: {scale} 46 | bbox: [{w}, {s}, {e}, {n}], 47 | format: {format}, 48 | quality: {quality}, 49 | tileSize: {tileSize}, 50 | getTile: function(z, x, y, callback){ 51 | // do something 52 | return callback(null, buffer, headers); 53 | }, 54 | limit: {limit} 55 | }; 56 | ``` 57 | or 58 | ```javascript 59 | // Calculate image bounds from center lng,lat coordinates and 60 | // pixel dimensions of final image (will be multipled by scale). 61 | var params = { 62 | zoom: {zoom}, 63 | scale: {scale} 64 | center: { 65 | x: {x}, 66 | y: {y}, 67 | w: {width}, 68 | h: {height} 69 | }, 70 | format: {format}, 71 | quality: {quality}, 72 | tileSize: {tileSize}, 73 | getTile: function(z,x,y, callback){ 74 | // do something 75 | return callback(null, buffer, headers); 76 | }, 77 | limit: {limit} 78 | }; 79 | ``` 80 | #### usage: 81 | ``` javascript 82 | abaculus(params, function(err, image, headers){ 83 | if (err) return err; 84 | // do something with image 85 | }); 86 | ``` 87 | 88 | #### output: 89 | an image of desired resolution for the selected area. 90 | -------------------------------------------------------------------------------- /changelog.md: -------------------------------------------------------------------------------- 1 | # CHANGELOG 2 | 3 | # v3.1.0 4 | 5 | * Update mocha to 6.x 6 | * Update mapnik to 4.2.1 7 | * Update d3-queue to 3.0.7 8 | * Add travis builds for node 6,8,10 latest lte releases 9 | 10 | 11 | # v3.0.0 12 | 13 | * Updates to mapnik 3.7.0 14 | * Drops windows support 15 | 16 | # v2.1.0 17 | 18 | * Switches sphericalmercator to use mapbox repo 19 | * Updates mapnik to 3.6.0 20 | 21 | # v2.0.3 22 | 23 | * Fixes a series of small bugs 24 | 25 | # v2.0.0 26 | 27 | * Removes support for Node version `v0.12.x` 28 | * Adds new optional `tileSize`. This is the native tileSize in pixels of the input tiles. If not provided, the API will default to `256`. 29 | -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | var SphericalMercator = require('@mapbox/sphericalmercator'); 2 | var queue = require('d3-queue').queue; 3 | var blend = require('mapnik').blend; 4 | var crypto = require('crypto'); 5 | 6 | module.exports = abaculus; 7 | 8 | function abaculus(arg, callback) { 9 | var z = arg.zoom || 0, 10 | s = arg.scale || 1, 11 | center = arg.center || null, 12 | bbox = arg.bbox || null, 13 | getTile = arg.getTile || null, 14 | format = arg.format || 'png', 15 | quality = arg.quality || null, 16 | limit = arg.limit || 19008, 17 | tileSize = arg.tileSize || 256; 18 | 19 | if (!getTile) return callback(new Error('Invalid function for getting tiles')); 20 | 21 | if (center) { 22 | // get center coordinates in px from lng,lat 23 | center = abaculus.coordsFromCenter(z, s, center, limit, tileSize); 24 | } else if (bbox) { 25 | // get center coordinates in px from [w,s,e,n] bbox 26 | center = abaculus.coordsFromBbox(z, s, bbox, limit, tileSize); 27 | } else { 28 | return callback(new Error('No coordinates provided.')); 29 | } 30 | // generate list of tile coordinates center 31 | var coords = abaculus.tileList(z, s, center, tileSize); 32 | 33 | // get tiles based on coordinate list and stitch them together 34 | abaculus.stitchTiles(coords, format, quality, getTile, callback); 35 | } 36 | 37 | abaculus.coordsFromBbox = function(z, s, bbox, limit, tileSize) { 38 | var sm = new SphericalMercator({ size: tileSize * s }); 39 | var topRight = sm.px([bbox[2], bbox[3]], z), 40 | bottomLeft = sm.px([bbox[0], bbox[1]], z); 41 | var center = {}; 42 | center.w = topRight[0] - bottomLeft[0]; 43 | center.h = bottomLeft[1] - topRight[1]; 44 | 45 | if (center.w <= 0 || center.h <= 0) throw new Error('Incorrect coordinates'); 46 | 47 | var origin = [topRight[0] - center.w / 2, topRight[1] + center.h / 2]; 48 | center.x = origin[0]; 49 | center.y = origin[1]; 50 | center.w = Math.round(center.w * s); 51 | center.h = Math.round(center.h * s); 52 | 53 | if (center.w >= limit || center.h >= limit) throw new Error('Desired image is too large.'); 54 | return center; 55 | }; 56 | 57 | abaculus.coordsFromCenter = function(z, s, center, limit, tileSize) { 58 | var sm = new SphericalMercator({ size: tileSize * s }); 59 | var origin = sm.px([center.x, center.y], z); 60 | center.x = origin[0]; 61 | center.y = origin[1]; 62 | center.w = Math.round(center.w * s); 63 | center.h = Math.round(center.h * s); 64 | 65 | if (center.w >= limit || center.h >= limit) throw new Error('Desired image is too large.'); 66 | return center; 67 | }; 68 | 69 | // Generate the zxy and px/py offsets needed for each tile in a static image. 70 | // x, y are center coordinates in pixels 71 | abaculus.tileList = function(z, s, center, tileSize) { 72 | var x = center.x, 73 | y = center.y, 74 | w = center.w, 75 | h = center.h; 76 | var dimensions = {x: w, y: h}; 77 | var size = tileSize || 256; 78 | var ts = Math.floor(size * s); 79 | 80 | var centerCoordinate = { 81 | column: x / size, 82 | row: y / size, 83 | zoom: z 84 | }; 85 | 86 | function pointCoordinate(point) { 87 | var coord = { 88 | column: centerCoordinate.column, 89 | row: centerCoordinate.row, 90 | zoom: centerCoordinate.zoom, 91 | }; 92 | coord.column += (point.x - w / 2) / ts; 93 | coord.row += (point.y - h / 2) / ts; 94 | return coord; 95 | } 96 | 97 | function coordinatePoint(coord) { 98 | // Return an x, y point on the map image for a given coordinate. 99 | if (coord.zoom != z) coord = coord.zoomTo(z); 100 | return { 101 | x: w / 2 + ts * (coord.column - centerCoordinate.column), 102 | y: h / 2 + ts * (coord.row - centerCoordinate.row) 103 | }; 104 | } 105 | 106 | function floorObj(obj) { 107 | return { 108 | row: Math.floor(obj.row), 109 | column: Math.floor(obj.column), 110 | zoom: obj.zoom 111 | }; 112 | } 113 | 114 | var maxTilesInRow = Math.pow(2, z); 115 | var tl = floorObj(pointCoordinate({x: 0, y:0})); 116 | var br = floorObj(pointCoordinate(dimensions)); 117 | var coords = {}; 118 | coords.tiles = []; 119 | 120 | for (var column = tl.column; column <= br.column; column++) { 121 | for (var row = tl.row; row <= br.row; row++) { 122 | var c = { 123 | column: column, 124 | row: row, 125 | zoom: z, 126 | }; 127 | var p = coordinatePoint(c); 128 | 129 | // Wrap tiles with negative coordinates. 130 | c.column = c.column % maxTilesInRow; 131 | if (c.column < 0) c.column = maxTilesInRow + c.column; 132 | 133 | if (c.row < 0 || c.row >= maxTilesInRow) continue; 134 | coords.tiles.push({ 135 | z: c.zoom, 136 | x: c.column, 137 | y: c.row, 138 | px: Math.round(p.x), 139 | py: Math.round(p.y) 140 | }); 141 | } 142 | } 143 | coords.dimensions = { x: w, y: h }; 144 | coords.center = floorObj(centerCoordinate); 145 | coords.scale = s; 146 | 147 | return coords; 148 | }; 149 | 150 | abaculus.stitchTiles = function(coords, format, quality, getTile, callback) { 151 | if (!coords) return callback(new Error('No coords object.')); 152 | var tileQueue = queue(32); 153 | var w = coords.dimensions.x, 154 | h = coords.dimensions.y, 155 | s = coords.scale, 156 | tiles = coords.tiles; 157 | 158 | tiles.forEach(function(t) { 159 | tileQueue.defer(function(z, x, y, px, py, done) { 160 | var cb = function(err, buffer, headers) { 161 | if (err) return done(err); 162 | done(err, { 163 | buffer: buffer, 164 | headers: headers, 165 | x: px, 166 | y: py, 167 | reencode: true 168 | }) 169 | }; 170 | cb.scale = s; 171 | cb.format = format; 172 | // getTile is a function that returns 173 | // a tile given z, x, y, & callback 174 | getTile(z, x, y, cb); 175 | }, t.z, t.x, t.y, t.px, t.py); 176 | }); 177 | 178 | function tileQueueFinish(err, data) { 179 | if (err) return callback(err); 180 | if (!data) return callback(new Error('No tiles to stitch.')); 181 | var headers = []; 182 | data.forEach(function(d) { 183 | headers.push(d.headers); 184 | }); 185 | 186 | blend(data, { 187 | format: format, 188 | quality: quality, 189 | width: w, 190 | height: h, 191 | reencode: true 192 | }, function(err, buffer) { 193 | if (err) return callback(err); 194 | callback(null, buffer, headerReduce(headers, format)); 195 | }); 196 | } 197 | 198 | tileQueue.awaitAll(tileQueueFinish); 199 | }; 200 | 201 | // Calculate TTL from newest (max mtime) layer. 202 | function headerReduce(headers, format) { 203 | var minmtime = new Date('Sun, 23 Feb 2014 18:00:00 UTC'); 204 | var composed = {}; 205 | 206 | composed['Cache-Control'] = 'max-age=3600'; 207 | 208 | switch (format) { 209 | case 'vector.pbf': 210 | composed['Content-Type'] = 'application/x-protobuf'; 211 | composed['Content-Encoding'] = 'deflate'; 212 | break; 213 | case 'jpeg': 214 | composed['Content-Type'] = 'image/jpeg'; 215 | break; 216 | case 'png': 217 | composed['Content-Type'] = 'image/png'; 218 | break; 219 | } 220 | 221 | var times = headers.reduce(function(memo, h) { 222 | if (!h) return memo; 223 | for (var k in h) if (k.toLowerCase() === 'last-modified') { 224 | memo.push(new Date(h[k])); 225 | return memo; 226 | } 227 | return memo; 228 | }, []); 229 | if (!times.length) { 230 | times.push(new Date()); 231 | } else { 232 | times.push(minmtime); 233 | } 234 | composed['Last-Modified'] = (new Date(Math.max.apply(Math, times))).toUTCString(); 235 | 236 | var etag = headers.reduce(function(memo, h) { 237 | if (!h) return memo; 238 | for (var k in h) if (k.toLowerCase() === 'etag') { 239 | memo.push(h[k]); 240 | return memo; 241 | } 242 | return memo; 243 | }, []); 244 | if (!etag.length) { 245 | composed['ETag'] = '"' + crypto.createHash('md5').update(composed['Last-Modified']).digest('hex') + '"'; 246 | } else { 247 | composed['ETag'] = etag.length === 1 ? etag[0] : '"' + crypto.createHash('md5').update(etag.join(',')).digest('hex') + '"'; 248 | } 249 | 250 | return composed; 251 | } 252 | 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"sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==", 1351 | "dev": true, 1352 | "requires": { 1353 | "camelcase": "^5.0.0", 1354 | "decamelize": "^1.2.0" 1355 | } 1356 | } 1357 | } 1358 | } 1359 | } 1360 | } 1361 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@mapbox/abaculus", 3 | "version": "3.1.0", 4 | "description": "stitches map tiles together for high-res exporting from tm2", 5 | "main": "index.js", 6 | "contributors": [ 7 | "Yuri Astrakhan " 8 | ], 9 | "scripts": { 10 | "test": "mocha -R spec" 11 | }, 12 | "repository": { 13 | "type": "git", 14 | "url": "git@github.com:mapbox/abaculus.git" 15 | }, 16 | "dependencies": { 17 | "@mapbox/sphericalmercator": "^1.1.x", 18 | "mapnik": "^4.2.1", 19 | "d3-queue": "^3.0.7" 20 | }, 21 | "devDependencies": { 22 | "mocha": "^6.x" 23 | } 24 | } 25 | 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-------------------------------------------------------------------------------- /test/test.js: -------------------------------------------------------------------------------- 1 | var assert = require('assert'); 2 | var printer = require('../'); 3 | var fs = require('fs'); 4 | var path = require('path'); 5 | var mapnik = require('mapnik'); 6 | 7 | // defaults 8 | var zoom = 5, 9 | scale = 4, 10 | x = 4096, 11 | y = 4096, 12 | quality = 256, 13 | format = 'png', 14 | limit = 19008; 15 | 16 | 17 | // fixtures 18 | var tiles = fs.readdirSync(path.resolve(__dirname + '/fixtures/')).reduce(function(memo, basename) { 19 | var key = basename.split('.').slice(0, 4).join('.'); 20 | memo[key] = fs.readFileSync(path.resolve(__dirname + '/fixtures/' + basename)); 21 | return memo; 22 | }, {}); 23 | 24 | describe('Get center from bbox', function() { 25 | it('should fail if (x1, y1) and (x2,y2) are equal', function() { 26 | var bbox = [0, 0, 0, 0]; 27 | 28 | assert.throws( function() { 29 | printer.coordsFromBbox(zoom, scale, bbox, limit); 30 | }, /Incorrect coordinates/); 31 | }); 32 | it('should fail if the image is too large', function() { 33 | var bbox = [-60, -60, 60, 60]; 34 | 35 | assert.throws( function() { 36 | printer.coordsFromBbox(7, 2, bbox, limit); 37 | }, /Desired image is too large./); 38 | }); 39 | it('should return the correct coordinates', function() { 40 | var bbox = [-60, -60, 60, 60]; 41 | 42 | var center = printer.coordsFromBbox(zoom, scale, bbox, limit); 43 | assert.deepEqual(center.w, 10920); 44 | assert.deepEqual(center.h, 13736); 45 | assert.deepEqual(center.x, x); 46 | assert.deepEqual(center.y, y); 47 | }); 48 | }); 49 | 50 | describe('get coordinates from center', function() { 51 | it('should should fail if the image is too large', function() { 52 | var center = { 53 | x: 0, 54 | y: 0, 55 | w: 4752, 56 | h: 4752 57 | }; 58 | assert.throws( function() { 59 | printer.coordsFromCenter(zoom, scale, center, limit); 60 | }, /Desired image is too large./); 61 | }); 62 | it('should return correct origin coords', function() { 63 | var center = { 64 | x: 0, 65 | y: 20, 66 | w: 800, 67 | h: 800 68 | }; 69 | center = printer.coordsFromCenter(zoom, scale, center, limit); 70 | assert.equal(center.x, x); 71 | assert.equal(center.y, 3631); 72 | }); 73 | it('should return correct origin coords for negative y', function() { 74 | var zoom = 2, 75 | center = { 76 | x: 39, 77 | y: -14, 78 | w: 1000, 79 | h: 1000 80 | }; 81 | center = printer.coordsFromCenter(zoom, scale, center, limit); 82 | assert.equal(center.x, 623); 83 | assert.equal(center.y, 552); 84 | }); 85 | }); 86 | 87 | describe('create list of tile coordinates', function() { 88 | it('should return a tiles object with correct coords', function() { 89 | var zoom = 5, 90 | scale = 4, 91 | width = 1824, 92 | height = 1832, 93 | center = { x: 4096, y: 4096, w: width, h: height }; 94 | 95 | var expectedCoords = { 96 | tiles: [ 97 | { z: zoom, x: 15, y: 15, px: -112, py: -108 }, 98 | { z: zoom, x: 15, y: 16, px: -112, py: 916 }, 99 | { z: zoom, x: 16, y: 15, px: 912, py: -108 }, 100 | { z: zoom, x: 16, y: 16, px: 912, py: 916 } 101 | ], 102 | dimensions: { x: width, y: height }, 103 | center: { row: 16, column: 16, zoom: zoom }, 104 | scale: scale 105 | }; 106 | var coords = printer.tileList(zoom, scale, center); 107 | assert.deepEqual(JSON.stringify(coords), JSON.stringify(expectedCoords)); 108 | }); 109 | 110 | it('should return a tiles object with correct coords when image exceeds y coords', function() { 111 | var zoom = 2, 112 | scale = 1, 113 | width = 1000, 114 | height = 1000, 115 | center = {x: 623, y: 552, w: width, h: height}; 116 | 117 | var expectedCoords = { 118 | tiles: [ 119 | { z: zoom, x: 0, y: 0, px: -123, py: -52 }, 120 | { z: zoom, x: 0, y: 1, px: -123, py: 204 }, 121 | { z: zoom, x: 0, y: 2, px: -123, py: 460 }, 122 | { z: zoom, x: 0, y: 3, px: -123, py: 716 }, 123 | { z: zoom, x: 1, y: 0, px: 133, py: -52 }, 124 | { z: zoom, x: 1, y: 1, px: 133, py: 204 }, 125 | { z: zoom, x: 1, y: 2, px: 133, py: 460 }, 126 | { z: zoom, x: 1, y: 3, px: 133, py: 716 }, 127 | { z: zoom, x: 2, y: 0, px: 389, py: -52 }, 128 | { z: zoom, x: 2, y: 1, px: 389, py: 204 }, 129 | { z: zoom, x: 2, y: 2, px: 389, py: 460 }, 130 | { z: zoom, x: 2, y: 3, px: 389, py: 716 }, 131 | { z: zoom, x: 3, y: 0, px: 645, py: -52 }, 132 | { z: zoom, x: 3, y: 1, px: 645, py: 204 }, 133 | { z: zoom, x: 3, y: 2, px: 645, py: 460 }, 134 | { z: zoom, x: 3, y: 3, px: 645, py: 716 }, 135 | { z: zoom, x: 0, y: 0, px: 901, py: -52 }, 136 | { z: zoom, x: 0, y: 1, px: 901, py: 204 }, 137 | { z: zoom, x: 0, y: 2, px: 901, py: 460 }, 138 | { z: zoom, x: 0, y: 3, px: 901, py: 716 } 139 | ], 140 | dimensions: {x: width, y: height}, 141 | center: {row: 2, column: 2, zoom: zoom}, 142 | scale: scale 143 | }; 144 | var coords = printer.tileList(zoom, scale, center); 145 | assert.deepEqual(JSON.stringify(coords), JSON.stringify(expectedCoords)); 146 | }); 147 | 148 | it('should return a tiles object with correct coords when image is much bigger than world', function() { 149 | var zoom = 1, 150 | scale = 1, 151 | width = 2000, 152 | height = 2100, 153 | center = {x: 100, y: 100, w: width, h: height}; 154 | 155 | var expectedCoords = { 156 | tiles: [ 157 | {z: zoom, x: 0, y: 0, px: -124, py: 950}, 158 | {z: zoom, x: 0, y: 1, px: -124, py: 1206}, 159 | {z: zoom, x: 1, y: 0, px: 132, py: 950}, 160 | {z: zoom, x: 1, y: 1, px: 132, py: 1206}, 161 | {z: zoom, x: 0, y: 0, px: 388, py: 950}, 162 | {z: zoom, x: 0, y: 1, px: 388, py: 1206}, 163 | {z: zoom, x: 1, y: 0, px: 644, py: 950}, 164 | {z: zoom, x: 1, y: 1, px: 644, py: 1206}, 165 | {z: zoom, x: 0, y: 0, px: 900, py: 950}, 166 | {z: zoom, x: 0, y: 1, px: 900, py: 1206}, 167 | {z: zoom, x: 1, y: 0, px: 1156, py: 950}, 168 | {z: zoom, x: 1, y: 1, px: 1156, py: 1206}, 169 | {z: zoom, x: 0, y: 0, px: 1412, py: 950}, 170 | {z: zoom, x: 0, y: 1, px: 1412, py: 1206}, 171 | {z: zoom, x: 1, y: 0, px: 1668, py: 950}, 172 | {z: zoom, x: 1, y: 1, px: 1668, py: 1206}, 173 | {z: zoom, x: 0, y: 0, px: 1924, py: 950}, 174 | {z: zoom, x: 0, y: 1, px: 1924, py: 1206} 175 | ], 176 | dimensions: {x: width, y: height}, 177 | center: {row: 0, column: 0, zoom: zoom}, 178 | scale: scale 179 | }; 180 | var coords = printer.tileList(zoom, scale, center); 181 | assert.deepEqual(JSON.stringify(coords), JSON.stringify(expectedCoords)); 182 | }); 183 | }); 184 | 185 | [256, 512, 1024].forEach(function(size) { 186 | describe('stitch tiles into single png', function() { 187 | var expectedCoords = { 188 | tiles: [ 189 | { z: 1, x: 0, y: 0, px: 0, py: 0 }, 190 | { z: 1, x: 0, y: 1, px: 0, py: size }, 191 | { z: 1, x: 1, y: 0, px: size, py: 0 }, 192 | { z: 1, x: 1, y: 1, px: size, py: size } 193 | ], 194 | dimensions: { 195 | x: size * 2, 196 | y: size * 2 197 | }, 198 | center: { row: 1, column: 1, zoom: 1 }, 199 | scale: 1, 200 | tileSize: size 201 | }; 202 | 203 | it('should fail if no coordinates object', function(done) { 204 | printer.stitchTiles(null, format, quality, function() {}, function(err) { 205 | assert.equal(err.message, 'No coords object.'); 206 | done(); 207 | }); 208 | }); 209 | 210 | it('should return tiles and stitch them together', function(done) { 211 | var expectedImage = fs.readFileSync(path.resolve(__dirname + '/expected/expected.' + size + '.png')); 212 | 213 | printer.stitchTiles(expectedCoords, format, quality, getTileTest, function(err, image, header) { 214 | fs.writeFile(__dirname + '/outputs/expected.' + size + '.png', image, function(err){ 215 | checkImage(image, expectedImage); 216 | done(); 217 | }); 218 | }); 219 | }); 220 | }); 221 | 222 | describe('run entire function', function() { 223 | it('stitches images with a center coordinate', function(done) { 224 | var expectedImage = fs.readFileSync(path.resolve(__dirname + '/expected/center.' + size + '.png')); 225 | 226 | var params = { 227 | zoom: 1, 228 | scale: 1, 229 | center: { 230 | x: 0, 231 | y: 0, 232 | w: 200, 233 | h: 200 234 | }, 235 | format: 'png', 236 | quality: 50, 237 | tileSize: size, 238 | getTile: getTileTest 239 | }; 240 | 241 | printer(params, function(err, image) { 242 | assert.equal(err, null); 243 | 244 | fs.writeFile(__dirname + '/outputs/center.' + size + '.png', image, function(err){ 245 | assert.equal(err, null); 246 | console.log('\tVisually check image at '+ __dirname + '/outputs/center.' + size + '.png'); 247 | 248 | // byte by byte check of image: 249 | checkImage(image, expectedImage); 250 | done(); 251 | }); 252 | }); 253 | }); 254 | 255 | it('stitches images with a wsen bbox', function(done) { 256 | var expectedImage = fs.readFileSync(path.resolve(__dirname + '/expected/bbox.' + size + '.png')); 257 | 258 | var params = { 259 | zoom: 1, 260 | scale: 1, 261 | bbox: [-140, -80, 140, 80], 262 | format: 'png', 263 | quality: 50, 264 | tileSize: size, 265 | getTile: getTileTest 266 | }; 267 | 268 | printer(params, function(err, image, headers) { 269 | assert.equal(err, null); 270 | fs.writeFile(__dirname + '/outputs/bbox.' + size + '.png', image, function(err){ 271 | assert.equal(err, null); 272 | console.log('\tVisually check image at '+ __dirname + '/outputs/bbox.'+ size +'.png'); 273 | 274 | // byte by byte check of image: 275 | checkImage(image, expectedImage); 276 | done(); 277 | }); 278 | }); 279 | }) 280 | }); 281 | 282 | // This approximates a tilelive's getTile function 283 | // (https://github.com/mapbox/tilelive-vector/blob/master/index.js#L119-L218) 284 | // by loading a series of local png tiles 285 | // and returning the tile requested with the x, y, & z, 286 | // parameters along with the appropriate headers 287 | function getTileTest(z, x, y, callback) { 288 | var key = [z, x, y, size].join('.'); 289 | 290 | // Headers. 291 | var headers = { 292 | 'Last-Modified': new Date().toUTCString(), 293 | 'ETag':'73f12a518adef759138c142865287a18', 294 | 'Content-Type':'application/x-protobuf' 295 | }; 296 | 297 | if (!tiles[key]) { 298 | return callback(new Error('Tile does not exist')); 299 | } else { 300 | return callback(null, tiles[key], headers); 301 | } 302 | } 303 | 304 | function checkImage(actual, expected) { 305 | actual = new mapnik.Image.fromBytes(actual); 306 | expected = new mapnik.Image.fromBytes(expected); 307 | var max_diff_pixels = 0; 308 | var compare_alpha = true; 309 | var threshold = 16; 310 | var diff_pixels = actual.compare(expected, { 311 | threshold: threshold, 312 | alpha: compare_alpha 313 | }); 314 | if (diff_pixels > max_diff_pixels) { 315 | expected.save('test/outputs/center.fail.png'); 316 | } 317 | assert.equal(max_diff_pixels, diff_pixels); 318 | } 319 | 320 | }); 321 | --------------------------------------------------------------------------------