https://elbasani.gov.al/wp-content/plugins/gpx-viewer/js/leaflet-betterscale.js

1L.Control.BetterScale = L.Control.extend({
2	options: {
3		position: "bottomleft",
4		maxWidth: 150,
5		metric: !1,
6		imperial: !0,
7		updateWhenIdle: !1
8	},
9	onAdd: function (t) {
10		this._map = t;
11		var e = "leaflet-control-better-scale",
12			i = L.DomUtil.create("div", e),
13			n = this.options,
14			s = L.DomUtil.create("div", e + "-ruler", i);
15		L.DomUtil.create("div", e + "-ruler-block " + e + "-upper-first-piece", s), L.DomUtil.create("div", e + "-ruler-block " + e + "-upper-second-piece", s), L.DomUtil.create("div", e + "-ruler-block " + e + "-lower-first-piece", s), L.DomUtil.create("div", e + "-ruler-block " + e + "-lower-second-piece", s);
16		return this._addScales(n, e, i), this.ScaleContainer = i, t.on(n.updateWhenIdle ? "moveend" : "move", this._update, this), t.whenReady(this._update, this), i
17	},
18	onRemove: function (t) {
19		t.off(this.options.updateWhenIdle ? "moveend" : "move", this._update, this)
20	},
21	_addScales: function (t, e, i) {
22		this._iScale = L.DomUtil.create("div", e + "-label-div", i), this._iScaleLabel = L.DomUtil.create("div", e + "-label", this._iScale), this._iScaleFirstNumber = L.DomUtil.create("div", e + "-label " + e + "-first-number", this._iScale), this._iScaleSecondNumber = L.DomUtil.create("div", e + "-label " + e + "-second-number", this._iScale)
23	},
24	_update: function () {
25		var t = this._map.getBounds(),
26			e = t.getCenter().lat,
27			i = 6378137 * Math.PI * Math.cos(e * Math.PI / 180),

28			n = i * (t.getNorthEast().lng - t.getSouthWest().lng) / 180,
29			o = this._map.getSize(),
30			s = this.options,
31			a = 0;
32		o.x > 0 && (a = n * (s.maxWidth / o.x)), this._updateScales(s, a)
33	},
34	_updateScales: function (t, e) {
35		t.metric && e && this._updateMetric(e), t.imperial && e && this._updateImperial(e)
36	},
37	_updateMetric: function (t) {
38		var e, i, n, o, s, a = t,
39			r = this._iScaleFirstNumber,
40			h = this._iScaleSecondNumber,
41			l = this._iScale,
42			u = this._iScaleLabel;
43		u.innerHTML = "0",
44		a >= 1000 ? 
45			(e = a / 1000, i = this._getRoundNum(e), o = i / 2, l.style.width = this._getScaleWidth(i / e) + "px", r.innerHTML = o, h.innerHTML = i + " km")
46			: 
47			(n = this._getRoundNum(a), s = n / 2, l.style.width = this._getScaleWidth(n / a) + "px", r.innerHTML = s, h.innerHTML = n + " m")
48	},
49	_updateImperial: function (t) {
50		var e, i, n, o, s, a = 3.2808399 * t,
51			r = this._iScaleFirstNumber,
52			h = this._iScaleSecondNumber,
53			l = this._iScale,
54			u = this._iScaleLabel;
55		u.innerHTML = "0",
56		a > 2640 ?
57			(e = a / 5280, i = this._getRoundNum(e), o = i / 2, l.style.width = this._getScaleWidth(i / e) + "px", r.innerHTML = o, h.innerHTML = i + "mi")
58			:
59			(n = this._getRoundNum(a), s = n / 2, l.style.width = this._getScaleWidth(n / a) + "px", r.innerHTML = s, h.innerHTML = n + "ft")
60	},
61	_getScaleWidth: function (t) {
62		return Math.round(this.options.maxWidth * t) - 10
63	},
64	_getRoundNum: function (t) {
65		if (t >= 10) {
66			var e = Math.pow(10, (Math.floor(t) + "").length - 1),
67				i = t / e;
68			return i = i >= 10 ? 10 : i >= 5 ? 5 : i >= 3 ? 3 : i >= 2 ? 2 : 1, e * i
69		}
70		return t = t >= 5 ? 5.0 : t >= 3 ? 3.0 : t >= 2 ? 2.0 : 1.0, t
71	}
72});
73
74L.control.betterscale = function (options) {
75	return new L.Control.BetterScale(options)
76};