interface Point {
    x: number;
    y: number;
}
export interface Pinch {
    dx: number;
    dy: number;
    scale: number;
    rotation: number;
    prevCentroid: Point;
    nextCentroid: Point;
}
export declare function calculateCentroid(points: Point[]): Point;
export declare function calculateAverageDistance(points: Point[]): number;
export declare function calculateAverageAngleDisplacement(prevPoints: Point[], nextPoints: Point[]): number;
export declare function calculatePinch(prevPoints: Point[], nextPoints: Point[]): Pinch;
export {};