/**
 * Modulate a value between two ranges.
 * @param value
 * @param rangeA from [low, high]
 * @param rangeB to [low, high]
 * @param clamp
 */
export declare function modulate(value: number, rangeA: number[], rangeB: number[], clamp?: boolean): number;
/**
 * Rotate a point around a center.
 * @param x The x-axis coordinate of the point.
 * @param y The y-axis coordinate of the point.
 * @param cx The x-axis coordinate of the point to rotate round.
 * @param cy The y-axis coordinate of the point to rotate round.
 * @param angle The distance (in radians) to rotate.
 */
export declare function rotatePoint(x: number, y: number, cx: number, cy: number, angle: number): number[];
/**
 * Get the distance between two points.
 * @param x0 The x-axis coordinate of the first point.
 * @param y0 The y-axis coordinate of the first point.
 * @param x1 The x-axis coordinate of the second point.
 * @param y1 The y-axis coordinate of the second point.
 */
export declare function getDistance(x0: number, y0: number, x1: number, y1: number): number;
/**
 * Get an angle (radians) between two points.
 * @param x0 The x-axis coordinate of the first point.
 * @param y0 The y-axis coordinate of the first point.
 * @param x1 The x-axis coordinate of the second point.
 * @param y1 The y-axis coordinate of the second point.
 */
export declare function getAngle(x0: number, y0: number, x1: number, y1: number): number;
/**
 * Move a point in an angle by a distance.
 * @param x0
 * @param y0
 * @param a angle (radians)
 * @param d distance
 */
export declare function projectPoint(x0: number, y0: number, a: number, d: number): number[];
/**
 * Get the sector of an angle (e.g. quadrant, octant)
 * @param a The angle to check.
 * @param s The number of sectors to check.
 */
export declare function getSector(a: number, s?: number): number;
/**
 * Get a normal value representing how close two points are from being at a 45 degree angle.
 * @param x0 The x-axis coordinate of the first point.
 * @param y0 The y-axis coordinate of the first point.
 * @param x1 The x-axis coordinate of the second point.
 * @param y1 The y-axis coordinate of the second point.
 */
export declare function getAngliness(x0: number, y0: number, x1: number, y1: number): number;