import type { ElementSymbol } from '../element';
import type { Vec3 } from '../math';
import type { AnyStructure, Site } from './';
export declare const DEFAULT_FIT_PADDING: number;
export declare const FIT_ZOOM_REF_PX = 50;
export type StructureFitOpts = {
    atom_radius_scale?: number;
    same_size_atoms?: boolean;
    element_radius_overrides?: Partial<Record<ElementSymbol, number>>;
    site_radius_overrides?: ReadonlyMap<number, number>;
};
type StructureFitFrame = {
    center: Vec3;
    extent: number;
};
export declare const camera_needs_fit: (position: Vec3, previous_view: string | undefined, camera_view: string) => boolean;
export declare const site_base_radius: (site: Site, site_idx: number, opts: Omit<StructureFitOpts, `atom_radius_scale`>) => number;
export declare function structure_fit_frame(structure: AnyStructure | null | undefined, opts?: StructureFitOpts): StructureFitFrame;
export declare const ortho_zoom_for_extent: (fit_extent: number, width: number, height: number, initial_zoom: number) => number;
export declare const perspective_distance_for_extent: (fit_extent: number, width: number, height: number, vertical_fov_degrees: number) => number;
export declare const camera_position_for_target: (target: Vec3, distance: number, view_dir?: Vec3 | null) => Vec3;
export {};