| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * 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 -- Map Service |
| |
| @author Simon Hunt |
| */ |
| |
| /* |
| The Map Service caches GeoJSON maps, which can be loaded into the map |
| layer of the Topology View. |
| |
| A GeoMap 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 (exact |
| format to be decided). |
| |
| e.g. var geomap = MapService.fetchGeoMap('*continental-us'); |
| |
| The GeoMap object encapsulates topology data (features), and the |
| D3 projection object. |
| |
| Note that, since the GeoMap instance is cached / shared, it should |
| contain no state. |
| */ |
| |
| (function () { |
| 'use strict'; |
| |
| // injected references |
| var $log, $http, fs; |
| |
| // internal state |
| var mapCache = d3.map(), |
| bundledUrlPrefix = '../data/map/'; |
| |
| function getUrl(id) { |
| if (id[0] === '*') { |
| return bundledUrlPrefix + id.slice(1) + '.json'; |
| } |
| return id + '.json'; |
| } |
| |
| angular.module('onosSvg') |
| .factory('MapService', ['$log', '$http', 'FnService', |
| function (_$log_, _$http_, _fs_) { |
| $log = _$log_; |
| $http = _$http_; |
| fs = _fs_; |
| |
| |
| function fetchGeoMap(id) { |
| if (!fs.isS(id)) { |
| return null; |
| } |
| var url = getUrl(id), |
| promise = mapCache.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.mapdata = response.data; |
| }, function (response) { |
| // error |
| $log.warn('Failed to retrieve map data: ' + url, |
| response.status, response.data); |
| }); |
| |
| mapCache.set(id, promise); |
| |
| } else { |
| promise.meta.wasCached = true; |
| } |
| |
| return promise; |
| } |
| |
| var geoMapProj; |
| |
| function setProjForView(path, topoData) { |
| var dim = 1000; |
| |
| // start with unit scale, no translation.. |
| geoMapProj.scale(1).translate([0, 0]); |
| |
| // figure out dimensions of map data.. |
| var b = path.bounds(topoData), |
| 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 = .95 / Math.min(dx / dim, dy / dim); |
| var t = [dim / 2 - s * x, dim / 2 - s * y]; |
| |
| // set new scale, translation on the projection.. |
| geoMapProj.scale(s).translate(t); |
| } |
| |
| |
| function loadMapInto(mapLayer, id) { |
| var mapObject = fetchGeoMap(id); |
| if (!mapObject) { |
| $log.warn('Failed to load map: ' + id); |
| return null; |
| } |
| |
| var mapdata = mapObject.mapdata, |
| topoData, path; |
| |
| mapObject.then(function () { |
| // extracts the topojson data into geocoordinate-based geometry |
| topoData = topojson.feature(mapdata, mapdata.objects.states); |
| |
| // see: http://bl.ocks.org/mbostock/4707858 |
| geoMapProj = d3.geo.mercator(); |
| path = d3.geo.path().projection(geoMapProj); |
| |
| setProjForView(path, topoData); |
| |
| mapLayer.selectAll('path') |
| .data(topoData.features) |
| .enter() |
| .append('path') |
| .attr('d', path); |
| }); |
| // TODO: review whether we should just return true (not the map object) |
| return mapObject; |
| } |
| |
| return { |
| loadMapInto: loadMapInto |
| }; |
| }]); |
| |
| }()); |