kopia lustrzana https://github.com/FacilMap/facilmap
128 wiersze
3.3 KiB
JavaScript
128 wiersze
3.3 KiB
JavaScript
var request = require("request-promise");
|
||
var utils = require("./utils");
|
||
var config = require("../config");
|
||
var Promise = require("promise");
|
||
|
||
var ROUTING_URL = "https://api.mapbox.com/directions/v5/mapbox";
|
||
|
||
// The OpenLayers resolution for zoom level 1 is 0.7031249999891753
|
||
// and for zoom level 20 0.0000013411044763239684
|
||
// This is the distance of one pixel on the map in degrees
|
||
// The resolution for zoom level 19 is the resolution for zoom level 20 times 2, and so on.
|
||
// As we don’t need one route point per pixel, we raise the value a bit
|
||
var RESOLUTION_20 = 0.0000013411044763239684 * 4;
|
||
|
||
var ROUTING_TYPES = {
|
||
car: "driving",
|
||
bicycle: "cycling",
|
||
pedestrian: "walking"
|
||
};
|
||
|
||
var ACCESS_TOKEN = "pk.eyJ1IjoiY2RhdXRoIiwiYSI6ImNpdTYwMmZwMDAwM3AyenBhemM5NHM4ZmgifQ.93z6yuzcsxt3eZk9NxPGHA";
|
||
|
||
function calculateRouting(points, mode, simple) {
|
||
var coords = [ ];
|
||
for(var i=0; i<points.length; i++)
|
||
coords.push(points[i].lon + "," + points[i].lat);
|
||
|
||
var url = ROUTING_URL + "/" + ROUTING_TYPES[mode] + "/" + coords.join(";")
|
||
+ "?alternatives=false"
|
||
+ "&steps=false"
|
||
+ "&geometries=geojson"
|
||
+ "&overview=" + (simple ? "simplified" : "full")
|
||
+ "&annotations=false"
|
||
+ "&access_token=" + encodeURIComponent(ACCESS_TOKEN);
|
||
|
||
return request.get({
|
||
url: url,
|
||
json: true,
|
||
gzip: true,
|
||
headers: {
|
||
'User-Agent': config.userAgent
|
||
}
|
||
}).then(function(body) {
|
||
if(!body || (body.code == "OK" && (!body.legs || !body.legs[0])))
|
||
throw "Invalid response from routing server.";
|
||
|
||
if(body.code != 'Ok')
|
||
throw "Route could not be calculated (" + body.code + ").";
|
||
|
||
var ret = {
|
||
trackPoints : body.routes[0].geometry.coordinates.map(function(it) { return { lat: it[1], lon: it[0] }; }),
|
||
distance: body.routes[0].distance/1000,
|
||
time: body.routes[0].duration
|
||
};
|
||
|
||
if(!simple)
|
||
_calculateZoomLevels(ret.trackPoints);
|
||
|
||
return ret;
|
||
});
|
||
}
|
||
|
||
function _calculateZoomLevels(points) {
|
||
var segments = [ ];
|
||
var dist = 0;
|
||
for(var i=0; i<points.length; i++) {
|
||
if(i > 0)
|
||
dist += _distance(points[i-1], points[i]);
|
||
segments[i] = dist / RESOLUTION_20;
|
||
|
||
points[i].zoom = null;
|
||
|
||
if(i != 0 && i != points.length-1) {
|
||
var lastSegments = segments[i-1];
|
||
var thisSegments = segments[i];
|
||
for(var j = 0; j < 20; j++) {
|
||
lastSegments = Math.floor(lastSegments / 2);
|
||
thisSegments = Math.floor(thisSegments / 2);
|
||
if(lastSegments == thisSegments) {
|
||
points[i].zoom = 20 - j;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if(points[i].zoom == null)
|
||
points[i].zoom = 1;
|
||
}
|
||
}
|
||
|
||
function _distance(pos1, pos2) {
|
||
return Math.sqrt(Math.pow(pos1.lon-pos2.lon, 2) + Math.pow(pos1.lat-pos2.lat, 2));
|
||
}
|
||
|
||
function prepareForBoundingBox(points, bbox) {
|
||
points = _filterByZoom(points, bbox.zoom);
|
||
points = _filterByBbox(points, bbox);
|
||
return points;
|
||
}
|
||
|
||
function _filterByZoom(points, zoom) {
|
||
var ret = [ ];
|
||
for(var i=0; i<points.length; i++) {
|
||
if(points[i].zoom <= zoom)
|
||
ret.push(points[i]);
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
function _filterByBbox(points, bbox) {
|
||
var ret = [ ];
|
||
var lastIn = false;
|
||
for(var i=0; i<points.length; i++) {
|
||
var isIn = utils.isInBbox(points[i], bbox);
|
||
if(isIn && !lastIn && i >= 1) {
|
||
ret.push(points[i-1]);
|
||
}
|
||
if(isIn || lastIn)
|
||
ret.push(points[i]);
|
||
|
||
lastIn = isIn;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
exports.calculateRouting = calculateRouting;
|
||
exports._calculateZoomLevels = _calculateZoomLevels;
|
||
exports.prepareForBoundingBox = prepareForBoundingBox; |