import * as THREE from "three";
import type { AnnotationVertex, SurfaceHit } from "./types";
/**
 * State machine for one stroke in mode A (freehand).
 * On pointermove it keeps calling addSample; samples whose world distance from the previous
 * sample is < minGap are dropped to avoid over-density.
 * Vertices are stored in local space (the mesh converts the world hit point to local).
 */
export declare class StrokeContour {
    private minGap;
    private maxJump;
    private mesh;
    private verts;
    private last;
    private lastNormal;
    private has;
    /**
     * @param minGap  minimum sample spacing (world space), debounce
     * @param maxJump jump threshold (world space): drop the sample when distance > maxJump and the
     *                normal flips sharply, to prevent adjacent points landing at different depths
     *                (and the straight segment cutting through the model) when the stroke grazes a
     *                groove or contour edge.
     */
    constructor(minGap: number, maxJump: number, mesh: THREE.Mesh);
    begin(): void;
    addSample(hit: SurfaceHit): void;
    get vertices(): AnnotationVertex[];
    end(): AnnotationVertex[];
}