import { OptionItem } from '../../diagram/utils/option-item';
import { ZoomOperation } from './zoom-operation';
export declare class ZoomHelper {
    static readonly defaultZoom = 1;
    static readonly defaultMinScale = 0.1;
    static readonly defaultMaxScale = 4;
    static readonly zoomTypes: OptionItem[];
    static getZoom(oldZoom: number, operation: ZoomOperation): number;
    static adjustScale(scale: number, operation: ZoomOperation): number;
    static canScale(oldZoom: number, newZoom: number): boolean;
}