import * as OpenSeadragon from 'openseadragon';
import { BackCanvas } from './canvases/back-canvas';
import { FrontCanvas } from './canvases/front-canvas';
import { BaseShape } from './shapes';
export declare class OsdSelectionHandler {
    private viewer;
    /**
     * used for drawing shapes
     */
    readonly frontCanvas: FrontCanvas;
    /**
     * used to display fixed shapes
     */
    readonly backCanvas: BackCanvas;
    private resizeObserver;
    constructor(viewer: OpenSeadragon.Viewer);
    private onResize;
    private dispose;
    private setCanvasSize;
    private init;
    private updateZoom;
    private requestUpdate;
    private updateLoop;
    addShape(shape: BaseShape): void;
    removeShape(shape: BaseShape): void;
    clear(): void;
}
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