import type { LatticeConverters, Matrix3x3, Vec3 } from '../math';
import type { MeasureMode, Site } from './';
import type { Pbc } from './pbc';
type AngleMode = `degrees` | `radians`;
export declare const MAX_SELECTED_SITES = 8;
export declare const max_measured_sites: (mode: MeasureMode) => number;
export declare const rolls_measured_sites: (mode: MeasureMode) => boolean;
export declare function displacement_pbc(from: Vec3, to: Vec3, lattice_matrix: Matrix3x3 | null | undefined, converters?: LatticeConverters, pbc?: Pbc): Vec3;
export declare function angle_between_vectors(v1: Vec3, v2: Vec3, mode?: AngleMode): number;
export declare function pbc_chain_positions(positions: Vec3[], lattice_matrix: Matrix3x3 | null | undefined, pbc?: Pbc): Vec3[];
type DisplacementField = {
    vectors: Vec3[];
    rmsd: number;
    max_displacement: number;
};
export type DisplacementSummary = {
    rmsd: number;
    max_displacement: number;
    error: null;
} | {
    rmsd?: undefined;
    max_displacement?: undefined;
    error: string;
};
export declare function compute_displacements(reference_sites: Site[], current_sites: Site[], lattice_matrix: Matrix3x3 | null | undefined, pbc?: Pbc): DisplacementField;
export declare function dihedral_angle(p1: Vec3, p2: Vec3, p3: Vec3, p4: Vec3, lattice_matrix: Matrix3x3 | null | undefined, pbc?: Pbc, mode?: AngleMode): number;
export {};