1150 lines
28 KiB
JavaScript
1150 lines
28 KiB
JavaScript
/*! geolib 2.0.9 by Manuel Bieh
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* Library to provide geo functions like distance calculation,
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* conversion of decimal coordinates to sexagesimal and vice versa, etc.
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* WGS 84 (World Geodetic System 1984)
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*
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* @author Manuel Bieh
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* @url http://www.manuelbieh.com/
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* @version 2.0.9
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* @license MIT
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**/;(function(global, undefined) {
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"use strict";
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function Geolib() {}
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// Setting readonly defaults
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var geolib = Object.create(Geolib.prototype, {
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version: {
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value: "2.0.9"
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},
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radius: {
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value: 6378137
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},
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minLat: {
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value: -90
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},
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maxLat: {
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value: 90
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},
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minLon: {
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value: -180
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},
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maxLon: {
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value: 180
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},
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sexagesimalPattern: {
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value: /^([0-9]{1,3})°\s*([0-9]{1,3}(?:\.(?:[0-9]{1,2}))?)'\s*(([0-9]{1,3}(\.([0-9]{1,2}))?)"\s*)?([NEOSW]?)$/
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},
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measures: {
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value: Object.create(Object.prototype, {
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"m" : {value: 1},
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"km": {value: 0.001},
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"cm": {value: 100},
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"mm": {value: 1000},
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"mi": {value: (1 / 1609.344)},
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"sm": {value: (1 / 1852.216)},
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"ft": {value: (100 / 30.48)},
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"in": {value: (100 / 2.54)},
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"yd": {value: (1 / 0.9144)}
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})
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},
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prototype: {
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value: Geolib.prototype
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},
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extend: {
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value: function(methods, overwrite) {
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for(var prop in methods) {
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if(typeof geolib.prototype[prop] === 'undefined' || overwrite === true) {
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geolib.prototype[prop] = methods[prop];
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}
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}
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}
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}
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});
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if (typeof(Number.prototype.toRad) === "undefined") {
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Number.prototype.toRad = function() {
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return this * Math.PI / 180;
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};
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}
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if (typeof(Number.prototype.toDeg) === "undefined") {
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Number.prototype.toDeg = function() {
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return this * 180 / Math.PI;
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};
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}
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// Here comes the magic
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geolib.extend({
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decimal: {},
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sexagesimal: {},
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distance: null,
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getKeys: function(point) {
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// GeoJSON Array [longitude, latitude(, elevation)]
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if(Object.prototype.toString.call(point) == '[object Array]') {
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return {
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longitude: point.length >= 1 ? 0 : undefined,
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latitude: point.length >= 2 ? 1 : undefined,
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elevation: point.length >= 3 ? 2 : undefined
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};
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}
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var getKey = function(possibleValues) {
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var key;
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possibleValues.every(function(val) {
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// TODO: check if point is an object
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if(typeof point != 'object') {
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return true;
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}
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return point.hasOwnProperty(val) ? (function() { key = val; return false; }()) : true;
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});
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return key;
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};
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var longitude = getKey(['lng', 'lon', 'longitude']);
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var latitude = getKey(['lat', 'latitude']);
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var elevation = getKey(['alt', 'altitude', 'elevation', 'elev']);
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// return undefined if not at least one valid property was found
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if(typeof latitude == 'undefined' &&
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typeof longitude == 'undefined' &&
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typeof elevation == 'undefined') {
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return undefined;
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}
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return {
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latitude: latitude,
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longitude: longitude,
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elevation: elevation
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};
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},
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// returns latitude of a given point, converted to decimal
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// set raw to true to avoid conversion
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getLat: function(point, raw) {
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return raw === true ? point[this.getKeys(point).latitude] : this.useDecimal(point[this.getKeys(point).latitude]);
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},
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// Alias for getLat
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latitude: function(point) {
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return this.getLat.call(this, point);
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},
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// returns longitude of a given point, converted to decimal
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// set raw to true to avoid conversion
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getLon: function(point, raw) {
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return raw === true ? point[this.getKeys(point).longitude] : this.useDecimal(point[this.getKeys(point).longitude]);
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},
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// Alias for getLon
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longitude: function(point) {
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return this.getLon.call(this, point);
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},
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getElev: function(point) {
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return point[this.getKeys(point).elevation];
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},
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// Alias for getElev
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elevation: function(point) {
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return this.getElev.call(this, point);
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},
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coords: function(point, raw) {
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var retval = {
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latitude: raw === true ? point[this.getKeys(point).latitude] : this.useDecimal(point[this.getKeys(point).latitude]),
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longitude: raw === true ? point[this.getKeys(point).longitude] : this.useDecimal(point[this.getKeys(point).longitude])
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};
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var elev = point[this.getKeys(point).elevation];
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if(typeof elev !== 'undefined') {
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retval['elevation'] = elev;
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}
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return retval;
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},
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// checks if a variable contains a valid latlong object
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validate: function(point) {
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var keys = this.getKeys(point);
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if(typeof keys === 'undefined' || typeof keys.latitude === 'undefined' || keys.longitude === 'undefined') {
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return false;
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}
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var lat = point[keys.latitude];
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var lng = point[keys.longitude];
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if(typeof lat === 'undefined' || !this.isDecimal(lat) && !this.isSexagesimal(lat)) {
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return false;
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}
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if(typeof lng === 'undefined' || !this.isDecimal(lng) && !this.isSexagesimal(lng)) {
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return false;
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}
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lat = this.useDecimal(lat);
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lng = this.useDecimal(lng);
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if(lat < this.minLat || lat > this.maxLat || lng < this.minLon || lng > this.maxLon) {
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return false;
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}
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return true;
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},
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/**
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* Calculates geodetic distance between two points specified by latitude/longitude using
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* Vincenty inverse formula for ellipsoids
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* Vincenty Inverse Solution of Geodesics on the Ellipsoid (c) Chris Veness 2002-2010
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* (Licensed under CC BY 3.0)
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*
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* @param object Start position {latitude: 123, longitude: 123}
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* @param object End position {latitude: 123, longitude: 123}
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* @param integer Accuracy (in meters)
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* @return integer Distance (in meters)
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*/
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getDistance: function(start, end, accuracy) {
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accuracy = Math.floor(accuracy) || 1;
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var s = this.coords(start);
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var e = this.coords(end);
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var a = 6378137, b = 6356752.314245, f = 1/298.257223563; // WGS-84 ellipsoid params
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var L = (e['longitude']-s['longitude']).toRad();
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var cosSigma, sigma, sinAlpha, cosSqAlpha, cos2SigmaM, sinSigma;
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var U1 = Math.atan((1-f) * Math.tan(parseFloat(s['latitude']).toRad()));
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var U2 = Math.atan((1-f) * Math.tan(parseFloat(e['latitude']).toRad()));
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var sinU1 = Math.sin(U1), cosU1 = Math.cos(U1);
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var sinU2 = Math.sin(U2), cosU2 = Math.cos(U2);
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var lambda = L, lambdaP, iterLimit = 100;
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do {
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var sinLambda = Math.sin(lambda), cosLambda = Math.cos(lambda);
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sinSigma = (
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Math.sqrt(
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(
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cosU2 * sinLambda
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) * (
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cosU2 * sinLambda
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) + (
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cosU1 * sinU2 - sinU1 * cosU2 * cosLambda
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) * (
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cosU1 * sinU2 - sinU1 * cosU2 * cosLambda
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)
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)
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);
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if (sinSigma === 0) {
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return geolib.distance = 0; // co-incident points
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}
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cosSigma = sinU1 * sinU2 + cosU1 * cosU2 * cosLambda;
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sigma = Math.atan2(sinSigma, cosSigma);
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sinAlpha = cosU1 * cosU2 * sinLambda / sinSigma;
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cosSqAlpha = 1 - sinAlpha * sinAlpha;
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cos2SigmaM = cosSigma - 2 * sinU1 * sinU2 / cosSqAlpha;
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if (isNaN(cos2SigmaM)) {
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cos2SigmaM = 0; // equatorial line: cosSqAlpha=0 (§6)
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}
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var C = (
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f / 16 * cosSqAlpha * (
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4 + f * (
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4 - 3 * cosSqAlpha
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)
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)
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);
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lambdaP = lambda;
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lambda = (
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L + (
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1 - C
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) * f * sinAlpha * (
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sigma + C * sinSigma * (
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cos2SigmaM + C * cosSigma * (
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-1 + 2 * cos2SigmaM * cos2SigmaM
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)
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)
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)
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);
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} while (Math.abs(lambda-lambdaP) > 1e-12 && --iterLimit>0);
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if (iterLimit === 0) {
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return NaN; // formula failed to converge
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}
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var uSq = (
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cosSqAlpha * (
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a * a - b * b
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) / (
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b*b
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)
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);
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var A = (
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1 + uSq / 16384 * (
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4096 + uSq * (
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-768 + uSq * (
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320 - 175 * uSq
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)
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)
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)
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);
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var B = (
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uSq / 1024 * (
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256 + uSq * (
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-128 + uSq * (
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74-47 * uSq
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)
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)
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)
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);
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var deltaSigma = (
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B * sinSigma * (
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cos2SigmaM + B / 4 * (
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cosSigma * (
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-1 + 2 * cos2SigmaM * cos2SigmaM
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) -B / 6 * cos2SigmaM * (
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-3 + 4 * sinSigma * sinSigma
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) * (
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-3 + 4 * cos2SigmaM * cos2SigmaM
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)
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)
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)
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);
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var distance = b * A * (sigma - deltaSigma);
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distance = distance.toFixed(3); // round to 1mm precision
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//if (start.hasOwnProperty(elevation) && end.hasOwnProperty(elevation)) {
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if (typeof this.elevation(start) !== 'undefined' && typeof this.elevation(end) !== 'undefined') {
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var climb = Math.abs(this.elevation(start) - this.elevation(end));
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distance = Math.sqrt(distance * distance + climb * climb);
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}
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return this.distance = Math.floor(
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Math.round(distance / accuracy) * accuracy
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);
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/*
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// note: to return initial/final bearings in addition to distance, use something like:
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var fwdAz = Math.atan2(cosU2*sinLambda, cosU1*sinU2-sinU1*cosU2*cosLambda);
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var revAz = Math.atan2(cosU1*sinLambda, -sinU1*cosU2+cosU1*sinU2*cosLambda);
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return { distance: s, initialBearing: fwdAz.toDeg(), finalBearing: revAz.toDeg() };
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*/
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},
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/**
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* Calculates the distance between two spots.
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* This method is more simple but also far more inaccurate
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*
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* @param object Start position {latitude: 123, longitude: 123}
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* @param object End position {latitude: 123, longitude: 123}
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* @param integer Accuracy (in meters)
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* @return integer Distance (in meters)
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*/
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getDistanceSimple: function(start, end, accuracy) {
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accuracy = Math.floor(accuracy) || 1;
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var distance =
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Math.round(
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Math.acos(
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Math.sin(
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this.latitude(end).toRad()
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) *
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Math.sin(
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this.latitude(start).toRad()
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) +
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Math.cos(
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this.latitude(end).toRad()
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) *
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Math.cos(
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this.latitude(start).toRad()
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) *
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Math.cos(
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this.longitude(start).toRad() - this.longitude(end).toRad()
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)
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) * this.radius
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);
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return geolib.distance = Math.floor(Math.round(distance/accuracy)*accuracy);
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},
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/**
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* Calculates the center of a collection of geo coordinates
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*
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* @param array Collection of coords [{latitude: 51.510, longitude: 7.1321}, {latitude: 49.1238, longitude: "8° 30' W"}, ...]
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* @return object {latitude: centerLat, longitude: centerLng, distance: diagonalDistance}
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*/
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getCenter: function(coords) {
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if (!coords.length) {
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return false;
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}
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var max = function( array ){
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return Math.max.apply( Math, array );
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};
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var min = function( array ){
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return Math.min.apply( Math, array );
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};
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var latitude;
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var longitude;
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var splitCoords = {latitude: [], longitude: []};
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for(var coord in coords) {
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splitCoords.latitude.push(
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this.latitude(coords[coord])
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);
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splitCoords.longitude.push(
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this.longitude(coords[coord])
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);
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}
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var minLat = min(splitCoords.latitude);
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var minLon = min(splitCoords.longitude);
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var maxLat = max(splitCoords.latitude);
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var maxLon = max(splitCoords.longitude);
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latitude = ((minLat + maxLat)/2).toFixed(6);
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longitude = ((minLon + maxLon)/2).toFixed(6);
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// distance from the deepest left to the highest right point (diagonal distance)
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var distance = this.convertUnit('km', this.getDistance({latitude: minLat, longitude: minLon}, {latitude: maxLat, longitude: maxLon}));
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return {
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latitude: latitude,
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longitude: longitude,
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distance: distance
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};
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},
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/**
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* Gets the max and min, latitude, longitude, and elevation (if provided).
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* @param array array with coords e.g. [{latitude: 51.5143, longitude: 7.4138}, {latitude: 123, longitude: 123}, ...]
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* @return object {maxLat: maxLat,
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* minLat: minLat
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* maxLng: maxLng,
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* minLng: minLng,
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* maxElev: maxElev,
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* minElev: minElev}
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*/
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getBounds: function(coords) {
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if (!coords.length) {
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return false;
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}
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var useElevation = this.elevation(coords[0]);
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var stats = {
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maxLat: -Infinity,
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minLat: Infinity,
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maxLng: -Infinity,
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minLng: Infinity
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};
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if (typeof useElevation != 'undefined') {
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stats.maxElev = 0;
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stats.minElev = Infinity;
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}
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for (var i = 0, l = coords.length; i < l; ++i) {
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stats.maxLat = Math.max(this.latitude(coords[i]), stats.maxLat);
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stats.minLat = Math.min(this.latitude(coords[i]), stats.minLat);
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stats.maxLng = Math.max(this.longitude(coords[i]), stats.maxLng);
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stats.minLng = Math.min(this.longitude(coords[i]), stats.minLng);
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if (useElevation) {
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stats.maxElev = Math.max(this.elevation(coords[i]), stats.maxElev);
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stats.minElev = Math.min(this.elevation(coords[i]), stats.minElev);
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}
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}
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return stats;
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},
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/**
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* Computes the bounding coordinates of all points on the surface
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* of the earth less than or equal to the specified great circle
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* distance.
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*
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* @param object Point position {latitude: 123, longitude: 123}
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* @param number Distance (in meters).
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* @return array Collection of two points defining the SW and NE corners.
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*/
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getBoundsOfDistance: function(point, distance) {
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var latitude = this.latitude(point);
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var longitude = this.longitude(point);
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var radLat = latitude.toRad();
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var radLon = longitude.toRad();
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var radDist = distance / this.radius;
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var minLat = radLat - radDist;
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var maxLat = radLat + radDist;
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var MAX_LAT_RAD = this.maxLat.toRad();
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var MIN_LAT_RAD = this.minLat.toRad();
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var MAX_LON_RAD = this.maxLon.toRad();
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var MIN_LON_RAD = this.minLon.toRad();
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var minLon;
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var maxLon;
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if (minLat > MIN_LAT_RAD && maxLat < MAX_LAT_RAD) {
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var deltaLon = Math.asin(Math.sin(radDist) / Math.cos(radLat));
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minLon = radLon - deltaLon;
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if (minLon < MIN_LON_RAD) {
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minLon += 2 * Math.PI;
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}
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maxLon = radLon + deltaLon;
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if (maxLon > MAX_LON_RAD) {
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maxLon -= 2 * Math.PI;
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}
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} else {
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// A pole is within the distance.
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minLat = Math.max(minLat, MIN_LAT_RAD);
|
|
maxLat = Math.min(maxLat, MAX_LAT_RAD);
|
|
minLon = MIN_LON_RAD;
|
|
maxLon = MAX_LON_RAD;
|
|
}
|
|
|
|
return [
|
|
// Southwest
|
|
{
|
|
latitude: minLat.toDeg(),
|
|
longitude: minLon.toDeg()
|
|
},
|
|
// Northeast
|
|
{
|
|
latitude: maxLat.toDeg(),
|
|
longitude: maxLon.toDeg()
|
|
}
|
|
];
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Checks whether a point is inside of a polygon or not.
|
|
* Note that the polygon coords must be in correct order!
|
|
*
|
|
* @param object coordinate to check e.g. {latitude: 51.5023, longitude: 7.3815}
|
|
* @param array array with coords e.g. [{latitude: 51.5143, longitude: 7.4138}, {latitude: 123, longitude: 123}, ...]
|
|
* @return bool true if the coordinate is inside the given polygon
|
|
*/
|
|
isPointInside: function(latlng, coords) {
|
|
|
|
for(var c = false, i = -1, l = coords.length, j = l - 1; ++i < l; j = i) {
|
|
|
|
if(
|
|
(
|
|
(this.longitude(coords[i]) <= this.longitude(latlng) && this.longitude(latlng) < this.longitude(coords[j])) ||
|
|
(this.longitude(coords[j]) <= this.longitude(latlng) && this.longitude(latlng) < this.longitude(coords[i]))
|
|
) &&
|
|
(
|
|
this.latitude(latlng) < (this.latitude(coords[j]) - this.latitude(coords[i])) *
|
|
(this.longitude(latlng) - this.longitude(coords[i])) /
|
|
(this.longitude(coords[j]) - this.longitude(coords[i])) +
|
|
this.latitude(coords[i])
|
|
)
|
|
) {
|
|
c = !c;
|
|
}
|
|
|
|
}
|
|
|
|
return c;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Shortcut for geolib.isPointInside()
|
|
*/
|
|
isInside: function() {
|
|
return this.isPointInside.apply(this, arguments);
|
|
},
|
|
|
|
|
|
/**
|
|
* Checks whether a point is inside of a circle or not.
|
|
*
|
|
* @param object coordinate to check (e.g. {latitude: 51.5023, longitude: 7.3815})
|
|
* @param object coordinate of the circle's center (e.g. {latitude: 51.4812, longitude: 7.4025})
|
|
* @param integer maximum radius in meters
|
|
* @return bool true if the coordinate is within the given radius
|
|
*/
|
|
isPointInCircle: function(latlng, center, radius) {
|
|
return this.getDistance(latlng, center) < radius;
|
|
},
|
|
|
|
|
|
/**
|
|
* Shortcut for geolib.isPointInCircle()
|
|
*/
|
|
withinRadius: function() {
|
|
return this.isPointInCircle.apply(this, arguments);
|
|
},
|
|
|
|
|
|
/**
|
|
* Gets rhumb line bearing of two points. Find out about the difference between rhumb line and
|
|
* great circle bearing on Wikipedia. It's quite complicated. Rhumb line should be fine in most cases:
|
|
*
|
|
* http://en.wikipedia.org/wiki/Rhumb_line#General_and_mathematical_description
|
|
*
|
|
* Function heavily based on Doug Vanderweide's great PHP version (licensed under GPL 3.0)
|
|
* http://www.dougv.com/2009/07/13/calculating-the-bearing-and-compass-rose-direction-between-two-latitude-longitude-coordinates-in-php/
|
|
*
|
|
* @param object origin coordinate (e.g. {latitude: 51.5023, longitude: 7.3815})
|
|
* @param object destination coordinate
|
|
* @return integer calculated bearing
|
|
*/
|
|
getRhumbLineBearing: function(originLL, destLL) {
|
|
|
|
// difference of longitude coords
|
|
var diffLon = this.longitude(destLL).toRad() - this.longitude(originLL).toRad();
|
|
|
|
// difference latitude coords phi
|
|
var diffPhi = Math.log(
|
|
Math.tan(
|
|
this.latitude(destLL).toRad() / 2 + Math.PI / 4
|
|
) /
|
|
Math.tan(
|
|
this.latitude(originLL).toRad() / 2 + Math.PI / 4
|
|
)
|
|
);
|
|
|
|
// recalculate diffLon if it is greater than pi
|
|
if(Math.abs(diffLon) > Math.PI) {
|
|
if(diffLon > 0) {
|
|
diffLon = (2 * Math.PI - diffLon) * -1;
|
|
}
|
|
else {
|
|
diffLon = 2 * Math.PI + diffLon;
|
|
}
|
|
}
|
|
|
|
//return the angle, normalized
|
|
return (Math.atan2(diffLon, diffPhi).toDeg() + 360) % 360;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Gets great circle bearing of two points. See description of getRhumbLineBearing for more information
|
|
*
|
|
* @param object origin coordinate (e.g. {latitude: 51.5023, longitude: 7.3815})
|
|
* @param object destination coordinate
|
|
* @return integer calculated bearing
|
|
*/
|
|
getBearing: function(originLL, destLL) {
|
|
|
|
destLL['latitude'] = this.latitude(destLL);
|
|
destLL['longitude'] = this.longitude(destLL);
|
|
originLL['latitude'] = this.latitude(originLL);
|
|
originLL['longitude'] = this.longitude(originLL);
|
|
|
|
var bearing = (
|
|
(
|
|
Math.atan2(
|
|
Math.sin(
|
|
destLL['longitude'].toRad() -
|
|
originLL['longitude'].toRad()
|
|
) *
|
|
Math.cos(
|
|
destLL['latitude'].toRad()
|
|
),
|
|
Math.cos(
|
|
originLL['latitude'].toRad()
|
|
) *
|
|
Math.sin(
|
|
destLL['latitude'].toRad()
|
|
) -
|
|
Math.sin(
|
|
originLL['latitude'].toRad()
|
|
) *
|
|
Math.cos(
|
|
destLL['latitude'].toRad()
|
|
) *
|
|
Math.cos(
|
|
destLL['longitude'].toRad() - originLL['longitude'].toRad()
|
|
)
|
|
)
|
|
).toDeg() + 360
|
|
) % 360;
|
|
|
|
return bearing;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Gets the compass direction from an origin coordinate to a destination coordinate.
|
|
*
|
|
* @param object origin coordinate (e.g. {latitude: 51.5023, longitude: 7.3815})
|
|
* @param object destination coordinate
|
|
* @param string Bearing mode. Can be either circle or rhumbline
|
|
* @return object Returns an object with a rough (NESW) and an exact direction (NNE, NE, ENE, E, ESE, etc).
|
|
*/
|
|
getCompassDirection: function(originLL, destLL, bearingMode) {
|
|
|
|
var direction;
|
|
var bearing;
|
|
|
|
if(bearingMode == 'circle') {
|
|
// use great circle bearing
|
|
bearing = this.getBearing(originLL, destLL);
|
|
} else {
|
|
// default is rhumb line bearing
|
|
bearing = this.getRhumbLineBearing(originLL, destLL);
|
|
}
|
|
|
|
switch(Math.round(bearing/22.5)) {
|
|
case 1:
|
|
direction = {exact: "NNE", rough: "N"};
|
|
break;
|
|
case 2:
|
|
direction = {exact: "NE", rough: "N"};
|
|
break;
|
|
case 3:
|
|
direction = {exact: "ENE", rough: "E"};
|
|
break;
|
|
case 4:
|
|
direction = {exact: "E", rough: "E"};
|
|
break;
|
|
case 5:
|
|
direction = {exact: "ESE", rough: "E"};
|
|
break;
|
|
case 6:
|
|
direction = {exact: "SE", rough: "E"};
|
|
break;
|
|
case 7:
|
|
direction = {exact: "SSE", rough: "S"};
|
|
break;
|
|
case 8:
|
|
direction = {exact: "S", rough: "S"};
|
|
break;
|
|
case 9:
|
|
direction = {exact: "SSW", rough: "S"};
|
|
break;
|
|
case 10:
|
|
direction = {exact: "SW", rough: "S"};
|
|
break;
|
|
case 11:
|
|
direction = {exact: "WSW", rough: "W"};
|
|
break;
|
|
case 12:
|
|
direction = {exact: "W", rough: "W"};
|
|
break;
|
|
case 13:
|
|
direction = {exact: "WNW", rough: "W"};
|
|
break;
|
|
case 14:
|
|
direction = {exact: "NW", rough: "W"};
|
|
break;
|
|
case 15:
|
|
direction = {exact: "NNW", rough: "N"};
|
|
break;
|
|
default:
|
|
direction = {exact: "N", rough: "N"};
|
|
}
|
|
|
|
direction['bearing'] = bearing;
|
|
return direction;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Shortcut for getCompassDirection
|
|
*/
|
|
getDirection: function(originLL, destLL, bearingMode) {
|
|
return this.getCompassDirection.apply(this, arguments);
|
|
},
|
|
|
|
|
|
/**
|
|
* Sorts an array of coords by distance from a reference coordinate
|
|
*
|
|
* @param object reference coordinate e.g. {latitude: 51.5023, longitude: 7.3815}
|
|
* @param mixed array or object with coords [{latitude: 51.5143, longitude: 7.4138}, {latitude: 123, longitude: 123}, ...]
|
|
* @return array ordered array
|
|
*/
|
|
orderByDistance: function(latlng, coords) {
|
|
|
|
var coordsArray = [];
|
|
|
|
for(var coord in coords) {
|
|
|
|
var d = this.getDistance(latlng, coords[coord]);
|
|
|
|
coordsArray.push({
|
|
key: coord,
|
|
latitude: this.latitude(coords[coord]),
|
|
longitude: this.longitude(coords[coord]),
|
|
distance: d
|
|
});
|
|
|
|
}
|
|
|
|
return coordsArray.sort(function(a, b) { return a.distance - b.distance; });
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Finds the nearest coordinate to a reference coordinate
|
|
*
|
|
* @param object reference coordinate e.g. {latitude: 51.5023, longitude: 7.3815}
|
|
* @param mixed array or object with coords [{latitude: 51.5143, longitude: 7.4138}, {latitude: 123, longitude: 123}, ...]
|
|
* @return array ordered array
|
|
*/
|
|
findNearest: function(latlng, coords, offset, limit) {
|
|
|
|
offset = offset || 0;
|
|
limit = limit || 1;
|
|
var ordered = this.orderByDistance(latlng, coords);
|
|
|
|
if(limit === 1) {
|
|
return ordered[offset];
|
|
} else {
|
|
return ordered.splice(offset, limit);
|
|
}
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Calculates the length of a given path
|
|
*
|
|
* @param mixed array or object with coords [{latitude: 51.5143, longitude: 7.4138}, {latitude: 123, longitude: 123}, ...]
|
|
* @return integer length of the path (in meters)
|
|
*/
|
|
getPathLength: function(coords) {
|
|
|
|
var dist = 0;
|
|
var last;
|
|
|
|
for (var i = 0, l = coords.length; i < l; ++i) {
|
|
if(last) {
|
|
//console.log(coords[i], last, this.getDistance(coords[i], last));
|
|
dist += this.getDistance(this.coords(coords[i]), last);
|
|
}
|
|
last = this.coords(coords[i]);
|
|
}
|
|
|
|
return dist;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Calculates the speed between to points within a given time span.
|
|
*
|
|
* @param object coords with javascript timestamp {latitude: 51.5143, longitude: 7.4138, time: 1360231200880}
|
|
* @param object coords with javascript timestamp {latitude: 51.5502, longitude: 7.4323, time: 1360245600460}
|
|
* @param object options (currently "unit" is the only option. Default: km(h));
|
|
* @return float speed in unit per hour
|
|
*/
|
|
getSpeed: function(start, end, options) {
|
|
|
|
var unit = options && options.unit || 'km';
|
|
|
|
if(unit == 'mph') {
|
|
unit = 'mi';
|
|
} else if(unit == 'kmh') {
|
|
unit = 'km';
|
|
}
|
|
|
|
var distance = geolib.getDistance(start, end);
|
|
var time = ((end.time*1)/1000) - ((start.time*1)/1000);
|
|
var mPerHr = (distance/time)*3600;
|
|
var speed = Math.round(mPerHr * this.measures[unit] * 10000)/10000;
|
|
return speed;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Converts a distance from meters to km, mm, cm, mi, ft, in or yd
|
|
*
|
|
* @param string Format to be converted in
|
|
* @param float Distance in meters
|
|
* @param float Decimal places for rounding (default: 4)
|
|
* @return float Converted distance
|
|
*/
|
|
convertUnit: function(unit, distance, round) {
|
|
|
|
if(distance === 0 || typeof distance === 'undefined') {
|
|
|
|
if(this.distance === 0) {
|
|
// throw 'No distance given.';
|
|
return 0;
|
|
} else {
|
|
distance = this.distance;
|
|
}
|
|
|
|
}
|
|
|
|
unit = unit || 'm';
|
|
round = (null == round ? 4 : round);
|
|
|
|
if(typeof this.measures[unit] !== 'undefined') {
|
|
return this.round(distance * this.measures[unit], round);
|
|
} else {
|
|
throw new Error('Unknown unit for conversion.');
|
|
}
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Checks if a value is in decimal format or, if neccessary, converts to decimal
|
|
*
|
|
* @param mixed Value(s) to be checked/converted (array of latlng objects, latlng object, sexagesimal string, float)
|
|
* @return float Input data in decimal format
|
|
*/
|
|
useDecimal: function(value) {
|
|
|
|
if(Object.prototype.toString.call(value) === '[object Array]') {
|
|
|
|
var geolib = this;
|
|
|
|
value = value.map(function(val) {
|
|
|
|
//if(!isNaN(parseFloat(val))) {
|
|
if(geolib.isDecimal(val)) {
|
|
|
|
return geolib.useDecimal(val);
|
|
|
|
} else if(typeof val == 'object') {
|
|
|
|
if(geolib.validate(val)) {
|
|
|
|
return geolib.coords(val);
|
|
|
|
} else {
|
|
|
|
for(var prop in val) {
|
|
val[prop] = geolib.useDecimal(val[prop]);
|
|
}
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
} else if(geolib.isSexagesimal(val)) {
|
|
|
|
return geolib.sexagesimal2decimal(val);
|
|
|
|
} else {
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
});
|
|
|
|
return value;
|
|
|
|
} else if(typeof value === 'object' && this.validate(value)) {
|
|
|
|
return this.coords(value);
|
|
|
|
} else if(typeof value === 'object') {
|
|
|
|
for(var prop in value) {
|
|
value[prop] = this.useDecimal(value[prop]);
|
|
}
|
|
|
|
return value;
|
|
|
|
}
|
|
|
|
|
|
if (this.isDecimal(value)) {
|
|
|
|
return parseFloat(value);
|
|
|
|
} else if(this.isSexagesimal(value) === true) {
|
|
|
|
return parseFloat(this.sexagesimal2decimal(value));
|
|
|
|
}
|
|
|
|
throw new Error('Unknown format.');
|
|
|
|
},
|
|
|
|
/**
|
|
* Converts a decimal coordinate value to sexagesimal format
|
|
*
|
|
* @param float decimal
|
|
* @return string Sexagesimal value (XX° YY' ZZ")
|
|
*/
|
|
decimal2sexagesimal: function(dec) {
|
|
|
|
if (dec in this.sexagesimal) {
|
|
return this.sexagesimal[dec];
|
|
}
|
|
|
|
var tmp = dec.toString().split('.');
|
|
|
|
var deg = Math.abs(tmp[0]);
|
|
var min = ('0.' + tmp[1])*60;
|
|
var sec = min.toString().split('.');
|
|
|
|
min = Math.floor(min);
|
|
sec = (('0.' + sec[1]) * 60).toFixed(2);
|
|
|
|
this.sexagesimal[dec] = (deg + '° ' + min + "' " + sec + '"');
|
|
|
|
return this.sexagesimal[dec];
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Converts a sexagesimal coordinate to decimal format
|
|
*
|
|
* @param float Sexagesimal coordinate
|
|
* @return string Decimal value (XX.XXXXXXXX)
|
|
*/
|
|
sexagesimal2decimal: function(sexagesimal) {
|
|
|
|
if (sexagesimal in this.decimal) {
|
|
return this.decimal[sexagesimal];
|
|
}
|
|
|
|
var regEx = new RegExp(this.sexagesimalPattern);
|
|
var data = regEx.exec(sexagesimal);
|
|
var min = 0, sec = 0;
|
|
|
|
if(data) {
|
|
min = parseFloat(data[2]/60);
|
|
sec = parseFloat(data[4]/3600) || 0;
|
|
}
|
|
|
|
var dec = ((parseFloat(data[1]) + min + sec)).toFixed(8);
|
|
//var dec = ((parseFloat(data[1]) + min + sec));
|
|
|
|
// South and West are negative decimals
|
|
dec = (data[7] == 'S' || data[7] == 'W') ? parseFloat(-dec) : parseFloat(dec);
|
|
//dec = (data[7] == 'S' || data[7] == 'W') ? -dec : dec;
|
|
|
|
this.decimal[sexagesimal] = dec;
|
|
|
|
return dec;
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Checks if a value is in decimal format
|
|
*
|
|
* @param string Value to be checked
|
|
* @return bool True if in sexagesimal format
|
|
*/
|
|
isDecimal: function(value) {
|
|
|
|
value = value.toString().replace(/\s*/, '');
|
|
|
|
// looks silly but works as expected
|
|
// checks if value is in decimal format
|
|
return (!isNaN(parseFloat(value)) && parseFloat(value) == value);
|
|
|
|
},
|
|
|
|
|
|
/**
|
|
* Checks if a value is in sexagesimal format
|
|
*
|
|
* @param string Value to be checked
|
|
* @return bool True if in sexagesimal format
|
|
*/
|
|
isSexagesimal: function(value) {
|
|
|
|
value = value.toString().replace(/\s*/, '');
|
|
|
|
return this.sexagesimalPattern.test(value);
|
|
|
|
},
|
|
|
|
round: function(value, n) {
|
|
var decPlace = Math.pow(10, n);
|
|
return Math.round(value * decPlace)/decPlace;
|
|
}
|
|
|
|
});
|
|
|
|
// Node module
|
|
if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
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|
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|
global.geolib = module.exports = geolib;
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|
|
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// AMD module
|
|
} else if (typeof define === "function" && define.amd) {
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|
|
|
define("geolib", [], function () {
|
|
return geolib;
|
|
});
|
|
|
|
// we're in a browser
|
|
} else {
|
|
|
|
global.geolib = geolib;
|
|
|
|
}
|
|
|
|
}(this)); |