import { Vector2 } from '@daign/math';
import { ControlObject } from '../control-elements';
import { IControlModifier } from './iControlModifier';
/**
 * Abstract class for a chain of modifiers that restrict or modify the outcome of drawing actions.
 */
export declare class ControlModifierChain implements IControlModifier {
    enabled: boolean;
    private modifiers;
    selectorFunction: (updatedPoints: Vector2[], pointIndex: number, controlObject: ControlObject) => boolean;
    /**
     * Constructor.
     */
    constructor();
    /**
     * Method that applies the chain of modifiers to the point array.
     * @param updatedPoints - The array of updated points.
     * @param pointIndex - The index of the point that initiated the change.
     * @param controlObject - The corresponding control object.
     * @returns The modified array of points.
     */
    modifyPoints(updatedPoints: Vector2[], pointIndex: number, controlObject: ControlObject): Vector2[];
    /**
     * Add a modifier to the chain of modifiers. Can also be another ModifierChain.
     * @param modifier - The modifier to add.
     */
    addModifier(modifier: IControlModifier): void;
}