/**
 * Spline Curve
 *
 * Represents a cubic Bézier curve segment between two spline handles.
 * Uses De Casteljau's algorithm for curve operations.
 */
import { Vector3 } from '../modeling/transform';
export interface SplineCurveData {
    start_handle?: string;
    end_handle?: string;
    start?: string;
    start_ctrl?: string;
    end_ctrl?: string;
    end?: string;
}
export interface SplineCurveSplitResult {
    start: Vector3;
    start_ctrl: Vector3;
    middle_ctrl1: Vector3;
    middle: Vector3;
    middle_ctrl2: Vector3;
    end_ctrl: Vector3;
    end: Vector3;
}
export declare class SplineCurve {
    spline: any;
    start_handle: string;
    end_handle: string;
    start: string;
    start_ctrl: string;
    end_ctrl: string;
    end: string;
    constructor(spline: any, data?: SplineCurveData);
    /**
     * Get element (spline) this curve belongs to
     */
    get element(): any;
    /**
     * Extend curve with new data
     */
    extend(data: SplineCurveData): this;
    /**
     * Get curve key in spline's curves collection
     */
    getCurveKey(): string | undefined;
    /**
     * Check if curve is selected
     * Framework adapters would implement selection checking
     */
    isSelected(splineSelection?: Record<string, {
        vertices: string[];
    }>): boolean;
    /**
     * Get save copy for serialization
     */
    getSaveCopy(): SplineCurveData;
    /**
     * Get undo copy
     */
    getUndoCopy(): SplineCurveData;
    /**
     * Split a curve in two using De Casteljau's algorithm.
     * The split happens at the corresponding T (time) on the initial curve.
     *
     * @param time Point at which the split occurs (0 to 1)
     * @returns Adjusted and new points for the two new curves
     *
     * Source: https://stackoverflow.com/questions/8369488/splitting-a-bezier-curve
     */
    split(time: number): SplineCurveSplitResult;
}
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