import { Vector3, Line3, Box3 } from 'three';
export interface SelectionToolResult {
    changed: boolean;
}
declare abstract class SelectionBase {
    dragging: boolean;
    prevX: number;
    prevY: number;
    handlePointerDown(_e: PointerEvent): void;
    handlePointerUp(): void;
    handlePointerMove(_e: PointerEvent): SelectionToolResult;
    abstract get points(): number[];
    static normalizePoint(element: HTMLElement, x: number, y: number): [number, number];
}
export declare class LassoSelection extends SelectionBase {
    private lassoPoints;
    handlePointerDown(e: PointerEvent): void;
    handlePointerMove(e: PointerEvent): SelectionToolResult;
    get points(): number[];
}
export declare class BoxSelection extends SelectionBase {
    private startX;
    private startY;
    private currentX;
    private currentY;
    handlePointerDown(e: PointerEvent): void;
    handlePointerMove(e: PointerEvent): SelectionToolResult;
    get points(): number[];
}
export declare function convertTripletsToPoints(array: number[]): Vector3[];
export declare function connectPointsWithLines(points: Vector3[], target?: Line3[] | null): Line3[];
/**
 * Point-in-polygon test using ray casting to the right (+X direction).
 * Counts how many polygon segments the horizontal ray from `point` crosses.
 */
export declare function isPointInsidePolygon(point: Vector3, segments: Line3[]): boolean;
/**
 * Tests whether two 2D line segments cross each other.
 */
export declare function lineCrossesLine(a: Line3, b: Line3): boolean;
/**
 * Computes the 2D convex hull of a set of points (Andrew's monotone chain).
 * Only uses x, y components.
 */
export declare function getConvexHull(points: Vector3[]): Vector3[];
export declare function extractBoxVertices(box: Box3, target: Vector3[]): Vector3[];
export {};