kopia lustrzana https://github.com/FacilMap/facilmap
118 wiersze
3.3 KiB
JavaScript
118 wiersze
3.3 KiB
JavaScript
var request = require("request");
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var utils = require("./utils");
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var ROUTING_URL = "http://open.mapquestapi.com/directions/v2/route";
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var API_KEY = "Fmjtd%7Cluur2qubl9%2C80%3Do5-9aangr";
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// The OpenLayers resolution for zoom level 1 is 0.7031249999891753
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// and for zoom level 20 0.0000013411044763239684
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// This is the distance of one pixel on the map in degrees
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// The resolution for zoom level 19 is the resolution for zoom level 20 times 2, and so on.
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// As we don’t need one route point per pixel, we raise the value a bit
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var RESOLUTION_20 = 0.0000013411044763239684 * 4;
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function calculateRouting(points, mode, callback) {
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var json = {
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locations : [ ],
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options : {
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unit : "k",
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generalize : 0,
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narrativeType : "none",
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routeType : mode
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}
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};
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for(var i=0; i<points.length; i++)
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json.locations.push({ latLng : { lat: points[i].lat, lng: points[i].lon }});
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var url = ROUTING_URL + "?key="+API_KEY+"&inFormat=json&outFormat=json&json="+encodeURIComponent(JSON.stringify(json));
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request.get({ url: url, json: true }, function(err, res, body) {
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if(err)
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return callback(err);
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if(!body || !body.route)
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return callback("Invalid response from routing server.");
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if(body.route.routeError.message || (body.info.statuscode != 0 && body.info.messages.length > 0))
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return callback(body.route.routeError.message || body.info.messages.join(" "));
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if(!body.route.shape || !body.route.shape.shapePoints)
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return callback("Invalid response from routing server.");
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var ret = {
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actualPoints : [ ],
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distance : body.route.distance,
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time : body.route.time
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};
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for(var i=0; i<body.route.shape.shapePoints.length; i+=2) {
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ret.actualPoints.push({ lat: 1*body.route.shape.shapePoints[i], lon: 1*body.route.shape.shapePoints[i+1] });
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}
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_calculateZoomLevels(ret.actualPoints);
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callback(null, ret);
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});
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}
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function _calculateZoomLevels(points) {
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var segments = [ ];
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var dist = 0;
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for(var i=0; i<points.length; i++) {
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if(i > 0)
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dist += _distance(points[i-1], points[i]);
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segments[i] = dist / RESOLUTION_20;
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points[i].zoom = null;
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if(i != 0 && i != points.length-1) {
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var lastSegments = segments[i-1];
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var thisSegments = segments[i];
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for(var j = 0; j < 20; j++) {
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lastSegments = Math.floor(lastSegments / 2);
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thisSegments = Math.floor(thisSegments / 2);
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if(lastSegments == thisSegments) {
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points[i].zoom = 20 - j;
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break;
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}
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}
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}
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if(points[i].zoom == null)
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points[i].zoom = 1;
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}
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}
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function _distance(pos1, pos2) {
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return Math.sqrt(Math.pow(pos1.lon-pos2.lon, 2) + Math.pow(pos1.lat-pos2.lat, 2));
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}
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function prepareForBoundingBox(points, bbox) {
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points = _filterByZoom(points, bbox.zoom);
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points = _filterByBbox(points, bbox);
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return points;
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}
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function _filterByZoom(points, zoom) {
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var ret = [ ];
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for(var i=0; i<points.length; i++) {
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if(points[i].zoom <= zoom)
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ret.push(points[i]);
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}
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return ret;
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}
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function _filterByBbox(points, bbox) {
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var ret = [ ];
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var lastIn = false;
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for(var i=0; i<points.length; i++) {
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var isIn = utils.isInBbox(points[i], bbox);
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if(isIn && !lastIn && i >= 1) {
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ret.push(points[i-1]);
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}
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if(isIn || lastIn)
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ret.push(points[i]);
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lastIn = isIn;
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}
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return ret;
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}
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exports.calculateRouting = calculateRouting;
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exports.prepareForBoundingBox = prepareForBoundingBox; |