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       Unidraw_Intro - Unidraw library for graphical object editor development


       #include <Unidraw/class.h>
       #include <Unidraw/Components/class.h>
       #include <Unidraw/Commands/class.h>
       #include <Unidraw/Tools/class.h>
       #include <Unidraw/Graphic/class.h>

       CC ... -lUnidraw ... -lInterViews -lX -lm


       Unidraw  is an architecture for creating object-oriented graphical editors in domains such
       as technical and  artistic  drawing,  music  composition,  and  circuit  design.   Unidraw
       simpifies the construction of these editors by providing programming abstractions that are
       common across domains.  Unidraw defines four basic  abstractions:  components  encapsulate
       the  appearance and semantics of objects in a domain, tools support direct manipulation of
       components, commands define operations on  components  and  other  objects,  and  external
       representations define the mapping between components and the file format generated by the
       editor.  Unidraw also supports multiple views, graphical connectivity and confinement, and
       dataflow between components.

       The  Unidraw  library  contains  a  collection  of  classes  that  implement  the  Unidraw
       architecture.  The Unidraw library is used together with the rest  of  InterViews,  except
       the  graphic  structured  graphics  library,  to  develop domain-specific graphical object
       editors.  InterViews interactors and composition mechanisms support an application's  look
       and  feel,  while  the  Unidraw  library supports functionality unique to graphical object
       editors.  Currently, the Unidraw library provides its  own  structured  graphics  classes,
       which  are  similar  to  but incompatible with the graphic library classes.  Therefore you
       must not use both graphic and Unidraw classes in the same application.

       General Unidraw classes  are  declared  in  header  files  in  the  Unidraw  include  file
       subdirectory.  Component,  command,  tool, and structured graphics classes are declared in
       corresponding subdirectories under the Unidraw subdirectory.



       Generalized Graphical Object Editing, John M. Vlissides, Technical  Report  CSL-TR-90-427,
       Stanford University, June 1990.