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import {CircleMarker} from './CircleMarker';
import {Path} from './Path';
import * as Util from '../../core/Util';
import {toLatLng} from '../../geo/LatLng';
import {LatLngBounds} from '../../geo/LatLngBounds';
import {Earth} from '../../geo/crs/CRS.Earth';
/*
* @class Circle
* @aka L.Circle
* @inherits CircleMarker
*
* A class for drawing circle overlays on a map. Extends `CircleMarker`.
*
* It's an approximation and starts to diverge from a real circle closer to poles (due to projection distortion).
*
* @example
*
* ```js
* L.circle([50.5, 30.5], {radius: 200}).addTo(map);
* ```
*/
export var Circle = CircleMarker.extend({
initialize: function (latlng, options, legacyOptions) {
if (typeof options === 'number') {
// Backwards compatibility with 0.7.x factory (latlng, radius, options?)
options = Util.extend({}, legacyOptions, {radius: options});
}
Util.setOptions(this, options);
this._latlng = toLatLng(latlng);
if (isNaN(this.options.radius)) { throw new Error('Circle radius cannot be NaN'); }
// @section
// @aka Circle options
// @option radius: Number; Radius of the circle, in meters.
this._mRadius = this.options.radius;
},
// @method setRadius(radius: Number): this
// Sets the radius of a circle. Units are in meters.
setRadius: function (radius) {
this._mRadius = radius;
return this.redraw();
},
// @method getRadius(): Number
// Returns the current radius of a circle. Units are in meters.
getRadius: function () {
return this._mRadius;
},
// @method getBounds(): LatLngBounds
// Returns the `LatLngBounds` of the path.
getBounds: function () {
var half = [this._radius, this._radiusY || this._radius];
return new LatLngBounds(
this._map.layerPointToLatLng(this._point.subtract(half)),
this._map.layerPointToLatLng(this._point.add(half)));
},
setStyle: Path.prototype.setStyle,
_project: function () {
var lng = this._latlng.lng,
lat = this._latlng.lat,
map = this._map,
crs = map.options.crs;
if (crs.distance === Earth.distance) {
var d = Math.PI / 180,
latR = (this._mRadius / Earth.R) / d,
top = map.project([lat + latR, lng]),
bottom = map.project([lat - latR, lng]),
p = top.add(bottom).divideBy(2),
lat2 = map.unproject(p).lat,
lngR = Math.acos((Math.cos(latR * d) - Math.sin(lat * d) * Math.sin(lat2 * d)) /
(Math.cos(lat * d) * Math.cos(lat2 * d))) / d;
if (isNaN(lngR) || lngR === 0) {
lngR = latR / Math.cos(Math.PI / 180 * lat); // Fallback for edge case, #2425
}
this._point = p.subtract(map.getPixelOrigin());
this._radius = isNaN(lngR) ? 0 : p.x - map.project([lat2, lng - lngR]).x;
this._radiusY = p.y - top.y;
} else {
var latlng2 = crs.unproject(crs.project(this._latlng).subtract([this._mRadius, 0]));
this._point = map.latLngToLayerPoint(this._latlng);
this._radius = this._point.x - map.latLngToLayerPoint(latlng2).x;
}
this._updateBounds();
}
});
// @factory L.circle(latlng: LatLng, options?: Circle options)
// Instantiates a circle object given a geographical point, and an options object
// which contains the circle radius.
// @alternative
// @factory L.circle(latlng: LatLng, radius: Number, options?: Circle options)
// Obsolete way of instantiating a circle, for compatibility with 0.7.x code.
// Do not use in new applications or plugins.
export function circle(latlng, options, legacyOptions) {
return new Circle(latlng, options, legacyOptions);
}