import type { Vec2, Vec3 } from '../math';
import type { Camera, Object3D } from 'three';
export declare const LABEL_OFFSET_EPS = 1e-9;
type LabelOffsetSource = Vec3 | (() => Vec3);
export declare const choose_site_label_offset: (bond_directions: Vec3[], base_offset: Vec3) => Vec3;
export declare const label_screen_position: (atom_position: Vec3, label_offset: Vec3, visual_radius: number, label_screen_margin: number, label_camera: Camera, size: {
    width: number;
    height: number;
}) => Vec2;
export declare const make_label_position_calculator: (_atom_position: Vec3, label_offset: LabelOffsetSource, visual_radius: number, label_screen_margin: number) => (object: Object3D, label_camera: Camera, size: {
    width: number;
    height: number;
}) => Vec2;
export {};