import { type PageMesh } from './mesh';
import type { CurlAnchor } from './types';
/**
 * Natural conical page curl — the Xerox PARC / iBooks model.
 *
 * The leaf wraps an imaginary right circular cone whose apex rides the spine and
 * whose opening angle θ breathes over the turn (Hong, Card & Chen, 2004). A corner
 * grab yields a diagonal cone; a mid-edge grab blends toward a cylinder so the
 * free edge lifts as one. The curled sheet then rotates about the spine and settles
 * flat on the far side. Arc length from the apex is preserved, so the paper never
 * stretches — the motion reads as stiff, premium stock rather than cloth.
 *
 * Lone pages (`anchor.fill`) use the same cone and flop as a spread half; the
 * renderer hinges at the container edge and dissolves the leaf as it finishes.
 * Softening or delaying the fill path made single-page turns read as a peel-fade
 * instead of a page turn.
 */
export declare function deformCone(mesh: PageMesh, W: number, H: number, t: number, anchor: CurlAnchor): void;