https://rusaggression.gov.ua//zerum/leaflet/leaflet.draw/draw/handler/Draw.Circle.js

1/**
2 * @class L.Draw.Circle
3 * @aka Draw.Circle
4 * @inherits L.Draw.SimpleShape
5 */
6L.Draw.Circle = L.Draw.SimpleShape.extend({
7	statics: {
8		TYPE: 'circle'
9	},
10
11	options: {
12		shapeOptions: {
13			stroke: true,
14			color: '#3388ff',
15			weight: 4,
16			opacity: 0.5,
17			fill: true,
18			fillColor: null, //same as color by default
19			fillOpacity: 0.2,
20			clickable: true
21		},
22		showRadius: true,
23		metric: true, // Whether to use the metric measurement system or imperial
24		feet: true, // When not metric, use feet instead of yards for display
25		nautic: false // When not metric, not feet use nautic mile for display
26	},
27
28	// @method initialize(): void
29	initialize: function (map, options) {
30		// Save the type so super can fire, need to do this as cannot do this.TYPE :(
31		this.type = L.Draw.Circle.TYPE;
32
33		this._initialLabelText = L.drawLocal.draw.handlers.circle.tooltip.start;
34
35		L.Draw.SimpleShape.prototype.initialize.call(this, map, options);
36	},
37
38	_drawShape: function (latlng) {
39		// Calculate the distance based on the version
40		if (L.GeometryUtil.isVersion07x()) {
41			var distance = this._startLatLng.distanceTo(latlng);
42		} else {
43			var distance = this._map.distance(this._startLatLng, latlng);
44		}
45
46		if (!this._shape) {
47			this._shape = new L.Circle(this._startLatLng, distance, this.options.shapeOptions);
48			this._map.addLayer(this._shape);
49		} else {
50			this._shape.setRadius(distance);
51		}
52	},
53
54	_fireCreatedEvent: function () {
55		var circle = new L.Circle(this._startLatLng, this._shape.getRadius(), this.options.shapeOptions);
56		L.Draw.SimpleShape.prototype._fireCreatedEvent.call(this, circle);
57	},
58
59	_onMouseMove: function (e) {
60		var latlng = e.latlng,
61			showRadius = this.options.showRadius,
62			useMetric = this.options.metric,
63			radius;
64
65		this._tooltip.updatePosition(latlng);
66		if (this._isDrawing) {
67			this._drawShape(latlng);
68
69			// Get the new radius (rounded to 1 dp)
70			radius = this._shape.getRadius().toFixed(1);
71
72			var subtext = '';
73			if (showRadius) {
74				subtext = L.drawLocal.draw.handlers.circle.radius + ': ' +
75					L.GeometryUtil.readableDistance(radius, useMetric, this.options.feet, this.options.nautic);
76			}
77			this._tooltip.updateContent({
78				text: this._endLabelText,
79				subtext: subtext
80			});
81		}
82	}
83});