A Formal Model of Visualization in Computer Graphics Systems by Tamiya Onodera

By Tamiya Onodera

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This necessitates a fuller description of a system: every primitive is given a separate visualizing specification. In addition, it prevents new primitives from being adding without affecting other parts of the system. Finally, the pictorializing transformation is so descriptive that it can specify every type of attribute rendering process, and so abstract that it can do so in a unified manner. Chapter 4 Graphical Nucleus Conventional systems realize only a part of the functionality of a visualizing net in their visualizing process.

It will be obvious that this leads to a reduction in the number of multiplications. Let us consider a picture generated by tp(p,g). Assume that the pattern p contains Np points and is replicated N, times along the geometry g, and that this picture is supposed to be subject to geometric transformations N~ times subsequently. The straightforward implementation needs Np × N, × Nt point-by-matrlx multiplications, whereas the delayed version requires N, matrix-by-matrix multiplications plus Np x N, point-by-matrix ones.

This picture can be thought of as a greatly extended version of a so-called bit pattern :[or line types. Some graphics terminals are equipped with a mechanism of user-definable line types, which are specified through bit patterns of a certain length (16, 128, and so on). When the vector generator draws dots constituting a fine, it repeatedly references this bit pattern and draws a dot only if the referred dot is 'on'. The position where clipping occurs is not precisely specified in GKS. 3. 7: Effects of two different restrictive transformations of polyline mations.

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