maplair/dist/esm/layer/vector/Circle.js

JavaScript library for mobile-friendly interactive maps

import { LatLngBounds } from "../../geo/LatLngBounds.js";
import { EarthCRS } from "../../geo/crs/EarthCRS.js";
import { CircleMarker } from "./CircleMarker.js";
//#region src/layer/vector/Circle.js
var Circle = class Circle extends CircleMarker {
	constructor(latlng, options) {
		super(latlng, options);
		if (isNaN(this.options.radius)) throw new Error("Circle radius cannot be NaN");
		this.callInitHooks(Circle);
	}
	getBounds() {
		const half = [this._pxRadius, this._pxRadiusY ?? this._pxRadius];
		return new LatLngBounds(this._map.layerPointToLatLng(this._point.subtract(half)), this._map.layerPointToLatLng(this._point.add(half)));
	}
	_project() {
		const lng = this._latlng.lng, lat = this._latlng.lat, map = this._map, crs = map.options.crs;
		if (crs.distance === EarthCRS.distance) {
			const d = Math.PI / 180, latR = this._radius / EarthCRS.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;
			let 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);
			this._point = p.subtract(map.getPixelOrigin());
			this._pxRadius = isNaN(lngR) ? 0 : p.x - map.project([lat2, lng - lngR]).x;
			this._pxRadiusY = p.y - top.y;
		} else {
			const latlng2 = crs.unproject(crs.project(this._latlng).subtract([this._radius, 0]));
			this._point = map.latLngToLayerPoint(this._latlng);
			this._pxRadius = Math.abs(this._point.x - map.latLngToLayerPoint(latlng2).x);
		}
		this._updateBounds();
	}
};
//#endregion
export { Circle };

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