At present, object-oriented programming is emerging from the research labora- tories and invading into the field of industrial applications. More and more products have been implemented with the aid of object-oriented programming techniques and tools, usually as extensions of traditional languages in hybrid development systems. Some of the better known examples are OSF-Motif, News, Objective-C on the Ne XT computer, the C extension C++, and CLOS an object- oriented extension of LISP. All of these developments incorporate interactive graphics. Effective object-oriented systems in combination with a graphics kernel- does it mean that the field of computer graphics has now become merely an aspect of the object-oriented world? We do not think so. In spite of interesting individual developments, there are still no sound object-oriented graphics sys- tems available. If it is desired to develop a complex graphics application embed- ded in a window-oriented system then it is still necessary to work with elemen- tary tools. What is to be displayed and interactively modified inside a window must be specified with a set of graphics primitives at a low level, or has to be written with a standardized graphics kernel system such as GKS or PHIGS, i. e. , by kernels specified and implemented in a non-object-oriented style. With the terms GKS and PHIGS we enter the world of international graphics standards. GKS and PHIGS constitute systems, not mere collections of graphics primitives.
المزيد من الكتب الإلكترونية من نفس المؤلف (المؤلفين) / محرر
74٬462 كتب إلكترونية في هذه الفئة
