1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
import * as Util from '../core/Util';
import {Earth} from './crs/CRS.Earth';
import {toLatLngBounds} from './LatLngBounds';
/* @class LatLng
* @aka L.LatLng
*
* Represents a geographical point with a certain latitude and longitude.
*
* @example
*
* ```
* var latlng = L.latLng(50.5, 30.5);
* ```
*
* All Leaflet methods that accept LatLng objects also accept them in a simple Array form and simple object form (unless noted otherwise), so these lines are equivalent:
*
* ```
* map.panTo([50, 30]);
* map.panTo({lon: 30, lat: 50});
* map.panTo({lat: 50, lng: 30});
* map.panTo(L.latLng(50, 30));
* ```
*
* Note that `LatLng` does not inherit from Leafet's `Class` object,
* which means new classes can't inherit from it, and new methods
* can't be added to it with the `include` function.
*/
export function LatLng(lat, lng, alt) {
if (isNaN(lat) || isNaN(lng)) {
throw new Error('Invalid LatLng object: (' + lat + ', ' + lng + ')');
}
// @property lat: Number
// Latitude in degrees
this.lat = +lat;
// @property lng: Number
// Longitude in degrees
this.lng = +lng;
// @property alt: Number
// Altitude in meters (optional)
if (alt !== undefined) {
this.alt = +alt;
}
}
LatLng.prototype = {
// @method equals(otherLatLng: LatLng, maxMargin?: Number): Boolean
// Returns `true` if the given `LatLng` point is at the same position (within a small margin of error). The margin of error can be overridden by setting `maxMargin` to a small number.
equals: function (obj, maxMargin) {
if (!obj) { return false; }
obj = toLatLng(obj);
var margin = Math.max(
Math.abs(this.lat - obj.lat),
Math.abs(this.lng - obj.lng));
return margin <= (maxMargin === undefined ? 1.0E-9 : maxMargin);
},
// @method toString(): String
// Returns a string representation of the point (for debugging purposes).
toString: function (precision) {
return 'LatLng(' +
Util.formatNum(this.lat, precision) + ', ' +
Util.formatNum(this.lng, precision) + ')';
},
// @method distanceTo(otherLatLng: LatLng): Number
// Returns the distance (in meters) to the given `LatLng` calculated using the [Spherical Law of Cosines](https://en.wikipedia.org/wiki/Spherical_law_of_cosines).
distanceTo: function (other) {
return Earth.distance(this, toLatLng(other));
},
// @method wrap(): LatLng
// Returns a new `LatLng` object with the longitude wrapped so it's always between -180 and +180 degrees.
wrap: function () {
return Earth.wrapLatLng(this);
},
// @method toBounds(sizeInMeters: Number): LatLngBounds
// Returns a new `LatLngBounds` object in which each boundary is `sizeInMeters/2` meters apart from the `LatLng`.
toBounds: function (sizeInMeters) {
var latAccuracy = 180 * sizeInMeters / 40075017,
lngAccuracy = latAccuracy / Math.cos((Math.PI / 180) * this.lat);
return toLatLngBounds(
[this.lat - latAccuracy, this.lng - lngAccuracy],
[this.lat + latAccuracy, this.lng + lngAccuracy]);
},
clone: function () {
return new LatLng(this.lat, this.lng, this.alt);
}
};
// @factory L.latLng(latitude: Number, longitude: Number, altitude?: Number): LatLng
// Creates an object representing a geographical point with the given latitude and longitude (and optionally altitude).
// @alternative
// @factory L.latLng(coords: Array): LatLng
// Expects an array of the form `[Number, Number]` or `[Number, Number, Number]` instead.
// @alternative
// @factory L.latLng(coords: Object): LatLng
// Expects an plain object of the form `{lat: Number, lng: Number}` or `{lat: Number, lng: Number, alt: Number}` instead.
export function toLatLng(a, b, c) {
if (a instanceof LatLng) {
return a;
}
if (Util.isArray(a) && typeof a[0] !== 'object') {
if (a.length === 3) {
return new LatLng(a[0], a[1], a[2]);
}
if (a.length === 2) {
return new LatLng(a[0], a[1]);
}
return null;
}
if (a === undefined || a === null) {
return a;
}
if (typeof a === 'object' && 'lat' in a) {
return new LatLng(a.lat, 'lng' in a ? a.lng : a.lon, a.alt);
}
if (b === undefined) {
return null;
}
return new LatLng(a, b, c);
}
|
