Personal communicator having improved zoom and pan functions for editing information on touch sensitive display

A personal communicator comprising:

• an elongated casing of a size adapted to be held in the hand of a user;
• a cellular phone mounted in said casing and including a speaker mounted adjacent one end of said casing and a microphone mounted adjacent another end of said casing;
• a touchscreen display mounted on said casing and having a rectangular shape elongated in a direction similar to said casing, said touchscreen display forming a user interface for entering information into and outputting information from said communicator, said touchscreen display comprising a pressure sensitive overlay coupled with a liquid crystal display (LCD) for displaying different screens of information;
• processing means mounted in said casing, said processing means being connected to said touchscreen display for receiving information entered through said overlay and outputting information on said LCD, said processing means comprising screen management means for painting different screens on said LCD, said processing means having a plurality of modes of operation including a zoom mode;
• storage means for storing graphics image files;
• said screen management means comprising
• first means for painting on said LCD a first screen having a plurality of selectable buttons listing said graphics image files;
• second means for painting on said LCD a second screen in response to a user selecting one of said selectable buttons, said second screen having a view area displaying a graphics image from a selected one of said graphics image files, and a selectively actuated Zoom tool button;
• third means for switching operation to said zoom mode and displaying a magnification frame of predefined size and shape in said second screen and imposed on said graphics image in response to a user touching said overlay at a touch point with a finger, said frame being located beneath said touch point and delineating the actual portion of said graphics image to be magnified;
• fourth means operative in said zoom mode for moving said frame around said screen in response to sliding said finger around said overlay and in contact therewith;
• and
• fifth means operative in said zoom mode for magnifying and displaying said portion of said graphics image delineated by said frame, in response to disengaging said finger from said overlay.