/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2012-2018 DragonBones team and other contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
import { BaseObject } from "../core/index.js";
import { Matrix, Transform, Point } from "../geom/index.js";
import { ConstraintData, GeometryData, PathDisplayData } from "../model/index.js";
import { Armature } from "./Armature.js";
import { Bone } from "./Bone.js";
/**
 * @internal
 */
export declare abstract class Constraint extends BaseObject {
    protected static readonly _helpMatrix: Matrix;
    protected static readonly _helpTransform: Transform;
    protected static readonly _helpPoint: Point;
    /**
     * - For timeline state.
     * @internal
     */
    _constraintData: ConstraintData;
    protected _armature: Armature;
    /**
     * - For sort bones.
     * @internal
     */
    _target: Bone;
    /**
     * - For sort bones.
     * @internal
     */
    _root: Bone;
    protected _bone: Bone | null;
    protected _onClear(): void;
    abstract init(constraintData: ConstraintData, armature: Armature): void;
    abstract update(): void;
    abstract invalidUpdate(): void;
    get name(): string;
}
/**
 * @internal
 */
export declare class IKConstraint extends Constraint {
    static toString(): string;
    /**
     * - For timeline state.
     * @internal
     */
    _bendPositive: boolean;
    /**
     * - For timeline state.
     * @internal
     */
    _weight: number;
    protected _onClear(): void;
    private _computeA;
    private _computeB;
    init(constraintData: ConstraintData, armature: Armature): void;
    update(): void;
    invalidUpdate(): void;
}
/**
 * @internal
 */
export declare class PathConstraint extends Constraint {
    dirty: boolean;
    pathOffset: number;
    position: number;
    spacing: number;
    rotateOffset: number;
    rotateMix: number;
    translateMix: number;
    private _pathSlot;
    private _bones;
    private _spaces;
    private _positions;
    private _curves;
    private _boneLengths;
    private _pathGlobalVertices;
    private _segments;
    static toString(): string;
    protected _onClear(): void;
    protected _updatePathVertices(verticesData: GeometryData): void;
    protected _computeVertices(start: number, count: number, offset: number, out: Array<number>): void;
    protected _computeBezierCurve(pathDisplayDta: PathDisplayData, spaceCount: number, tangents: boolean, percentPosition: boolean, percentSpacing: boolean): void;
    private addCurvePosition;
    init(constraintData: ConstraintData, armature: Armature): void;
    update(): void;
    invalidUpdate(): void;
}