| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| ONOS GUI -- SVG -- GeoData Service |
| */ |
| |
| /* |
| The GeoData Service facilitates the fetching and caching of TopoJSON data |
| from the server, as well as providing a way of creating a path generator |
| for that data, to be used to render the map in an SVG layer. |
| |
| A TopoData object can be fetched by ID. IDs that start with an asterisk |
| identify maps bundled with the GUI. IDs that do not start with an |
| asterisk are assumed to be URLs to externally provided data. |
| |
| var topodata = GeoDataService.fetchTopoData('*continental-us'); |
| |
| The path generator can then be created for that data-set: |
| |
| var gen = GeoDataService.createPathGenerator(topodata, opts); |
| |
| opts is an optional argument that allows the override of default settings: |
| { |
| objectTag: 'states', |
| projection: d3.geo.mercator(), |
| logicalSize: 1000, |
| mapFillScale: .95 |
| }; |
| |
| The returned object (gen) comprises transformed data (TopoJSON -> GeoJSON), |
| the D3 path generator function, and the settings used ... |
| |
| { |
| geodata: { ... }, |
| pathgen: function (...) { ... }, |
| settings: { ... } |
| } |
| */ |
| |
| (function () { |
| 'use strict'; |
| |
| // injected references |
| var $log, $http, fs; |
| |
| // internal state |
| var cache = d3.map(), |
| bundledUrlPrefix = 'data/map/'; |
| |
| function getUrl(id) { |
| if (id[0] === '*') { |
| return bundledUrlPrefix + id.slice(1) + '.topojson'; |
| } |
| return id + '.topojson'; |
| } |
| |
| |
| // start afresh... |
| function clearCache() { |
| cache = d3.map(); |
| } |
| |
| // returns a promise decorated with: |
| // .meta -- id, url, and whether the data was cached |
| // .topodata -- TopoJSON data (on response from server) |
| |
| function fetchTopoData(id) { |
| if (!fs.isS(id)) { |
| return null; |
| } |
| var url = getUrl(id), |
| promise = cache.get(id); |
| |
| if (!promise) { |
| // need to fetch the data, build the object, |
| // cache it, and return it. |
| promise = $http.get(url); |
| |
| promise.meta = { |
| id: id, |
| url: url, |
| wasCached: false, |
| }; |
| |
| promise.then(function (response) { |
| // success |
| promise.topodata = response.data; |
| }, function (response) { |
| // error |
| $log.warn('Failed to retrieve map TopoJSON data: ' + url, |
| response.status, response.data); |
| }); |
| |
| cache.set(id, promise); |
| |
| } else { |
| promise.meta.wasCached = true; |
| } |
| |
| return promise; |
| } |
| |
| var defaultGenSettings = { |
| objectTag: 'states', |
| projection: d3.geo.mercator(), |
| logicalSize: 1000, |
| mapFillScale: .95, |
| }; |
| |
| // converts given TopoJSON-format data into corresponding GeoJSON |
| // data, and creates a path generator for that data. |
| function createPathGenerator(topoData, opts) { |
| var settings = angular.extend({}, defaultGenSettings, opts), |
| topoObject = topoData.objects[settings.objectTag], |
| geoData = topojson.feature(topoData, topoObject), |
| proj = settings.projection, |
| dim = settings.logicalSize, |
| mfs = settings.mapFillScale, |
| path = d3.geo.path().projection(proj); |
| |
| rescaleProjection(proj, mfs, dim, path, geoData, opts.adjustScale); |
| |
| // return the results |
| return { |
| geodata: geoData, |
| pathgen: path, |
| settings: settings, |
| }; |
| } |
| |
| function rescaleProjection(proj, mfs, dim, path, geoData, adjustScale) { |
| var adj = adjustScale || 1; |
| // adjust projection scale and translation to fill the view |
| // with the map |
| |
| // start with unit scale, no translation.. |
| proj.scale(1).translate([0, 0]); |
| |
| // figure out dimensions of map data.. |
| var b = path.bounds(geoData), |
| x1 = b[0][0], |
| y1 = b[0][1], |
| x2 = b[1][0], |
| y2 = b[1][1], |
| dx = x2 - x1, |
| dy = y2 - y1, |
| x = (x1 + x2) / 2, |
| y = (y1 + y2) / 2; |
| |
| // size map to 95% of minimum dimension to fill space.. |
| var s = (mfs / Math.min(dx / dim, dy / dim)) * adj, |
| t = [dim / 2 - s * x, dim / 2 - s * y]; |
| |
| // set new scale, translation on the projection.. |
| proj.scale(s).translate(t); |
| } |
| |
| angular.module('onosSvg') |
| .factory('GeoDataService', ['$log', '$http', 'FnService', |
| function (_$log_, _$http_, _fs_) { |
| $log = _$log_; |
| $http = _$http_; |
| fs = _fs_; |
| |
| |
| return { |
| clearCache: clearCache, |
| fetchTopoData: fetchTopoData, |
| createPathGenerator: createPathGenerator, |
| rescaleProjection: rescaleProjection, |
| }; |
| }]); |
| }()); |