import { Corners, Point, Rect } from '../types';
/**
 * Gets the four extreme points of a rectangle, inclusive.
 */
export declare function rectCorners({ x, y, width, height }: Rect): Corners;
/**
 * Gets the center point of a rectangle, optionally rounded.
 */
export declare function rectCenter({ x, y, width, height }: Rect, { round }?: {
    round?: boolean | undefined;
}): Point;
/**
 * Rounds a point to the nearest integer axis values.
 */
export declare function roundPoint({ x, y }: Point, { round }?: {
    round?: ((x: number) => number) | undefined;
}): Point;
/**
 * Flips a `Rect` vertically and horizontally within another `Rect`, equivalent
 * to a 180° rotation.
 *
 * @param outer bounding rectangle containing `inner` to flip within
 * @param inner rectangle to flip within `outer`
 */
export declare function flipRectVH(outer: Rect, inner: Rect): Rect;
/**
 * Find how many pixel moves it takes to get from a to b.
 */
export declare function editDistance(a: Point, b: Point): number;
export declare function euclideanDistance(a: Point, b: Point): number;
/**
 * Find the median of a list of numbers.
 */
export declare function median(numbers: ArrayLike<number>): number;
/**
 * Compute the inner angle formed by vectors `ba` and `bc`.
 *
 * @see https://math.stackexchange.com/a/361419
 */
export declare function angleBetweenPoints(a: Point, b: Point, c: Point): number;
/**
 * Compute the area of a triangle.
 *
 * @see https://www.mathopenref.com/coordtrianglearea.html
 */
export declare function triangleArea(a: Point, b: Point, c: Point): number;
/**
 * Compute the area of a 4-sided polygon.
 */
export declare function poly4Area([topLeft, topRight, bottomLeft, bottomRight,]: Corners): number;