/// <reference types="@arcgis/core/interfaces.d.ts" />
import { Nil } from '@arcgis/components-utils';
import { DirectionalPadAngle } from './constants';
export interface Vector {
    readonly x: number;
    readonly y: number;
}
/**
 * Find which of the 8 directions is closest to a given vector
 *
 * @private
 */
export declare function vectorToClosestAngle(vector: Vector): DirectionalPadAngle;
export declare function unitVectorToAngle({ x, y }: Vector): number;
export declare function angleToUnitVector(angle: number): Vector;
export declare function deg2rad(d: number): number;
export declare function rad2deg(r: number): number;
export declare function toUnitVector(first: Vector, second: Vector): Vector;
/**
 * Given an HTML element, find it's center coordinates
 *
 * @private
 */
export declare function findElementCenter(element: Element): Vector;
export declare function canShowNorth(view: __esri.MapView | __esri.SceneView | Nil): boolean;