export declare function difference(a: number, b: number): number;

export declare class Coordinate {
    x: number;
    y: number;
    distance: number;
    constructor(x: number, y: number, distance: number);
}

export declare function distance(a: Coordinate, b: Coordinate): number;

export declare class DotCoordinateInfo {
    dot: Dot;
    coordinate: Coordinate;
    constructor(dot: Dot, coordinate: Coordinate);
}

export declare function getCoordinates(settings: Settings): Coordinate[];

export declare function getDotCoordinateInfos(dots: Dot[], coordinates: Coordinate[]): DotCoordinateInfo[];

export declare function random<T>(array: T[]): T;

export declare class Dot {
    radius: number;
    color: string;
    constructor(radius?: number, color?: string);
}

export declare function getHtml(settings: Settings): string;

export declare class Settings {
    dots: Dot[];
    width: number;
    height: number;
    unit: string;
}