import { IDesignItem } from '../../../../item/IDesignItem.js';
import { IDesignerCanvas } from '../../IDesignerCanvas.js';
import { AbstractExtension } from '../AbstractExtension.js';
import { IExtensionManager } from '../IExtensionManger.js';
export declare class RotateExtension extends AbstractExtension {
    private _rotateLine?;
    private _rotateCircle?;
    private _startPoint;
    private _rotateCirclePosition;
    constructor(extensionManager: IExtensionManager, designerView: IDesignerCanvas, extendedItem: IDesignItem);
    extend(cache: Record<string | symbol, any>, event?: Event): void;
    refresh(cache: Record<string | symbol, any>, event?: Event): void;
    private _getRotateReferencePoint;
    getAngle(e: MouseEvent): string;
    dispose(): void;
}