/**
 * Spline Handle
 *
 * Represents a control point in a Bézier spline curve.
 * Each handle has a joint (main point) and two control points for curve shaping.
 */
export interface SplineHandleData {
    control1?: string;
    joint?: string;
    control2?: string;
    tilt?: number;
    size?: number;
}
export declare class SplineHandle {
    spline: any;
    joint: string;
    control1: string;
    control2: string;
    tilt: number;
    size: number;
    constructor(spline: any, data?: SplineHandleData);
    /**
     * Get element (spline) this handle belongs to
     */
    get element(): any;
    /**
     * Extend handle with new data
     */
    extend(data: SplineHandleData): this;
    /**
     * Get handle key in spline's handles collection
     */
    getHandleKey(): string | undefined;
    /**
     * Check if handle is selected
     * Framework adapters would implement selection checking
     */
    isSelected(splineSelection?: Record<string, {
        vertices: string[];
    }>): boolean;
    /**
     * Get save copy for serialization
     */
    getSaveCopy(): SplineHandleData;
    /**
     * Get undo copy
     */
    getUndoCopy(): SplineHandleData;
}
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