Systems and methods according to the present invention provide a control framework for organizing, selecting and launching media items including graphical user interfaces coupled with an optional free space control device for collection of the basic control primitives of point, click, scroll, hover and...http://www.google.com.hk/patents/US20040252119?utm_source=gb-gplus-share專利 US20040252119 - Systems and methods for resolution consistent semantic zooming
