By Peter Wisskirchen
At current, object-oriented programming is rising from the learn labora tories and invading into the sphere of commercial functions. progressively more items were carried out via object-oriented programming ideas and instruments, often as extensions of conventional languages in hybrid improvement platforms. the various greater recognized examples are OSF-Motif, information, Objective-C at the subsequent laptop, the C extension C++, and CLOS an item orientated extension of LISP. All of those advancements comprise interactive snap shots. powerful object-oriented platforms together with a pics kernel does it suggest that the sector of special effects has now develop into basically a facet of the object-oriented global? we don't imagine so. inspite of fascinating person advancements, there are nonetheless no sound object-oriented pictures sys tems on hand. whether it is wanted to increase a fancy photographs program embed ded in a window-oriented process then it truly is nonetheless essential to paintings with elemen tary instruments. what's to be displayed and interactively changed inside of a window has to be unique with a suite of photographs primitives at a low point, or needs to be written with a standardized photographs kernel process similar to GKS or PHIGS, i. e. , via kernels distinctive and carried out in a non-object-oriented kind. With the phrases GKS and PHIGS we input the area of overseas images criteria. GKS and PHIGS represent structures, no longer mere collections of photographs primitives.
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Additional info for Object-Oriented Graphics: From GKS and PHIGS to Object-Oriented Systems
The search for a matching method is illustrated by Fig. 7. The figure illustrates that several classes, in this example Band C, can inherit methods and variables from a common superclass. Inheritance provides a concept for sharing code. 4 Inheritance 37 organize two different classes and integrate them in the existing inheritance tree, an analysis of their intended behavior is useful. The following questions should be answered: what functionality already provided by the existing environment can be used?
The process of programming, however, differs from the use of a conventional system because of the great number of predefined classes and methods, the comfortable editor and especially the possibilities provided by inheritance: taking over predefined functionality and modifying it to fit current needs. Object-oriented programming is characterized by a high degree of re-use and modification of existing code. This style of programming-described in its cognitive aspects in Fischer, 1987-is a new experience for the programmer accustomed to working in a conventional environment.
And then execute objectOfB message2: arg . then super message1: test is handled as in the first case, that is, A is responsible. For the next expression, self message1: test, however, message1 : in B is evaluated. The example shows the difference of the two different search strategies quite clearly. The pseudovariables self and super are often used in the following context. Usually the classes higher in the hierarchy are predefined classes of the environment. In a growing system more and more subclasses are defined by the application programmer and added to the environment as subclasses of the predefined classes.
Object-Oriented Graphics: From GKS and PHIGS to Object-Oriented Systems by Peter Wisskirchen