import * as mat from "transformation-matrix";
import { VirtualMuzzle, VirtualMuzzleGenerator } from "../../muzzle";
export declare const calcDirectionRad: (src: mat.Matrix, dest: mat.Matrix) => number;
/**
 * Generate VirtualMuzzle aiming enemy every frame.
 */
export declare class AimingMuzzle implements VirtualMuzzleGenerator {
    /**
     * Generate virtual muzzle.
     */
    generate(): VirtualMuzzle;
}