import type { LatLngLiteral } from '../../map/lat-lng';
/**
 * Returns the heading from one LatLng to another LatLng. Headings are
 * expressed in degrees clockwise from North within the range [-180,180).
 *
 * @return The heading in degrees clockwise from north.
 */
export declare function computeHeading(from: LatLngLiteral, to: LatLngLiteral): number;
/**
 * Returns the LatLng resulting from moving a distance from an origin
 * in the specified heading (expressed in degrees clockwise from north).
 *
 * @param from The LatLng from which to start.
 * @param distance The distance to travel.
 * @param heading The heading in degrees clockwise from north.
 */
export declare function computeOffset(from: LatLngLiteral, distance: number, heading: number): LatLngLiteral;
/**
 * Returns the location of origin when provided with a LatLng destination,
 * meters travelled and original heading. Headings are expressed in degrees
 * clockwise from North. This function returns null when no solution is
 * available.
 *
 * @param to The destination LatLng.
 * @param distance The distance travelled, in meters.
 * @param heading The heading in degrees clockwise from north.
 */
export declare function computeOffsetOrigin(to: LatLngLiteral, distance: number, heading: number): LatLngLiteral | null;
/**
 * Returns the LatLng which lies the given fraction of the way between the
 * origin LatLng and the destination LatLng.
 *
 * @param from The LatLng from which to start.
 * @param to The LatLng toward which to travel.
 * @param fraction A fraction of the distance to travel.
 * @return The interpolated LatLng.
 */
export declare function interpolate(from: LatLngLiteral, to: LatLngLiteral, fraction: number): LatLngLiteral;
/**
 * Returns the angle between two LatLngs, in radians. This is the same as the distance
 * on the unit sphere.
 */
export declare function computeAngleBetween(from: LatLngLiteral, to: LatLngLiteral): number;
/**
 * Returns the distance between two LatLngs, in meters.
 */
export declare function computeDistanceBetween(from: LatLngLiteral, to: LatLngLiteral): number;
/**
 * Returns the length of the given path, in meters, on Earth.
 */
export declare function computeLength(path: LatLngLiteral[]): number;
/**
 * Returns the area of a closed path on Earth.
 *
 * @param path A closed path.
 * @return The path's area in square meters.
 */
export declare function computeArea(path: LatLngLiteral[]): number;
/**
 * Returns the signed area of a closed path on Earth. The sign of the area may be used to
 * determine the orientation of the path.
 * "inside" is the surface that does not contain the South Pole.
 *
 * @param path A closed path.
 * @return The loop's area in square meters.
 */
export declare function computeSignedArea(path: LatLngLiteral[], radius?: number): number;
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