<area shape="rect" href="$a00091.html" title="define the API for widget / widget representation" alt="" coords="28,229,161,256"> <area shape="rect" href="$a00902.html" title="an abstract superclass for classes observing events invoked by vtkRenderWindowInteractor..." alt="" coords="17,155,172,181"> <area shape="rect" href="$a01084.html" title="abstract base class for most VTK objects" alt="" coords="55,80,135,107"> <area shape="rect" href="$a01085.html" title="abstract base class for most VTK objects" alt="" coords="40,5,149,32">