/**
 * Calculates the squared value of the Euclidean distance between
 * two points (considering a point as a vector object).
 */
export declare function distSq(v1: p5.Vector, v2: p5.Vector): number;
/**
 * Multiplies the given matrix and array.
 * The number of matrix columns and the array length must be identical.
 * @param {number[][]} matrix - Any matrix.
 * @param {number[]} array - Any one-dimensional array of numbers.
 * @param {number[]} [target] - Target array for receiving the result.
 * @returns Product of the given values as an array.
 */
export declare function multiplyMatrixAndArray(matrix: number[][], array: number[], target?: number[]): number[];
/**
 * Calculates the difference between two angles in range of -PI to PI.
 * @param angleA - the angle to subtract from
 * @param angleB - the angle to subtract
 */
export declare function angleDifference(angleA: number, angleB: number): number;
/**
 * Calculates the direction angle from one vector to another.
 * @param referencePosition
 * @param targetPosition
 */
export declare function getDirectionAngle(referencePosition: p5.Vector, targetPosition: p5.Vector): number;
/**
 * Returns the position on the line segment AB which is closest to the reference point P.
 * @param {p5.Vector} P - The position of the reference point.
 * @param {p5.Vector} A - The position of the line segment start point.
 * @param {p5.Vector} B - The position of the line segment end point.
 * @param {p5.Vector} target - The vector to receive the result.
 */
export declare function getClosestPositionOnLineSegment(P: p5.Vector, A: p5.Vector, B: p5.Vector, target: p5.Vector): p5.Vector;
/**
 * Just lerp.
 * @param startValue - The start value.
 * @param endValue - The end value.
 * @param ratio - The ratio between 0 and 1.
 */
export declare function lerp(startValue: number, endValue: number, ratio: number): number;