import Viewer from '../../viewer/Viewer';
import ViewerEvent from '../../viewer/ViewerEvent';
import DraggableTool from '../DraggableTool';
/**
 * PointTool makes a Point annotation on a mouse click.
 */
export default class PointTool extends DraggableTool {
    protected usePointerLockAPI: boolean;
    private drawing;
    activate(viewer: Viewer): void;
    deactivate(viewer: Viewer): void;
    private toVolumeCoordinate;
    dragStartHandler(ev: ViewerEvent): void;
    dragHandler(ev: ViewerEvent): void;
    dragEndHandler(ev: ViewerEvent): void;
}