import type vtkVolume from '@kitware/vtk.js/Rendering/Core/Volume';
import type { ICamera, IImageVolume, Point3 } from '../../types/index.js';
import getSliceRange from '../../utilities/getSliceRange.js';
export interface PlanarVolumeSliceNavigationState {
    currentSliceIndex: number;
    sliceRange: ReturnType<typeof getSliceRange>;
    spacingInNormalDirection: number;
}
export declare function getPlanarVolumeSliceNavigationState(args: {
    actor: vtkVolume;
    camera: Pick<ICamera, 'focalPoint' | 'position' | 'viewPlaneNormal'>;
    imageVolume: IImageVolume;
}): PlanarVolumeSliceNavigationState;
export declare function getPlanarVolumeSlicePoint(args: {
    camera: Pick<ICamera, 'focalPoint' | 'position' | 'viewPlaneNormal'>;
    delta: number;
    sliceRange: ReturnType<typeof getSliceRange>;
    spacingInNormalDirection: number;
}): {
    newFocalPoint: Point3;
    newPosition: Point3;
};