/**
 * Convert a radians angle into degrees
 *
 * @param {number} radians Angle in radians
 * @returns {number} Angle in degrees
 */
export declare function toDegrees(radians: number): number;
/**
 * Convert a degrees angle into radians
 *
 * @param {number} degrees Angle in degrees
 * @returns {number} Angle in radians
 */
export declare function toRadians(degrees: number): number;
/**
 * Compute the angle (in radians) from a point to another
 *
 * @param  {number} x1 X-axis coordinate of the start point
 * @param  {number} y1 Y-axis coordinate of the start point
 * @param  {number} x2 X-axis coordinate of the end point
 * @param  {number} y2 Y-axis coordinate of the end point
 * @returns {number} Computed angle (in radians)
 */
export declare function angle(x1: number, y1: number, x2: number, y2: number): number;
/**
 * Compute the closest angle (in radians) between two angles
 *
 * @param {number} startAngle Start angle (in radians)
 * @param {number} endAngle   End angle (in radians)
 * @returns {number} Closest angle (in radians)
 */
export declare function closestAngle(startAngle: number, endAngle: number): number;
/**
 * Compute the distance between two points
 *
 * @param {number} x1 X-axis coordinate of the start point
 * @param {number} y1 Y-axis coordinate of the start point
 * @param {number} x2 X-axis coordinate of the end point
 * @param {number} y2 Y-axis coordinate of the end point
 * @returns {number} Computed distance
 */
export declare function distance(x1: number, y1: number, x2: number, y2: number): number;
/**
 * Compute the length of the diagonal of a rectangle
 *
 * @param {number} width  Width of the rectangle
 * @param {number} height Height of the rectangle
 * @returns {number} Diagonal length
 */
export declare function diagonal(width: number, height: number): number;
export type FitInput = {
    width: number;
    height: number;
};
export type FitOutput = {
    left: number;
    top: number;
    width: number;
    height: number;
    scale: number;
};
/**
 * Make a target fit a container (cover mode)
 *
 * @param {FitInput} target Dimensions of the target
 * @param {FitInput} container Dimensions of the container
 * @returns {FitOutput}
 */
export declare function cover(target: FitInput, container: FitInput): FitOutput;
/**
 * Make a target fit a container (contain mode)
 *
 * @param {FitInput} target Dimensions of the target
 * @param {FitInput} container Dimensions of the container
 * @returns {FitOutput}
 */
export declare function contain(target: FitInput, container: FitInput): FitOutput;