By Dr. Günter Enderle, Dr. Klaus Kansy, Dr. Günther Pfaff (auth.)

TO special effects dependent ONGKS half I provides an advent to simple ideas of desktop graph­ ics and to the rules and ideas of GKS. The goals of this half are twofold: to supply the newbie with an summary of the terminology and ideas of special effects, in keeping with GKS, and to offer the pc pix specialist an introduc­ tion to the GKS common. within the early chapters of this half, the most components of special effects, a few of the periods of com­ puter images clients, the interfaces of GKS and its underlying layout recommendations are mentioned and demanding phrases are outlined. The later chapters supply a casual creation to the most recommendations of GKS and their interrelationships: output, attributes, coordinate structures, ameliorations, enter, segments, metafile, country lists, and mistake dealing with. This creation to the GKS framework will arrange the floor for the unique description of 2nd GKS features partially III and the 3D extensions to GKS partially IV. 1 what's special effects? 1. 1 Defmition of special effects the knowledge Processing Vocabulary of the overseas association for Stan­ dardization (ISO) [ISO eighty four] defines special effects as follows: "Methods and strategies for changing info to and from a photograph exhibit through computing device. " This definition refers to 3 easy elements of any special effects process - particularly "data", "computer", and "display".

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An event report contains the identification of a logical input device and a logical input value from that device. Event reports, which can only be created by the actions of the operator, are generated asynchronously from the input devices in EVENT mode. The application program can remove the oldest event report from the queue and examine its contents. The application program can also flush from the queue all event reports from a specified logical input device. The request input mode reads input from a graphical workstation in very much the same way as a normal FORTRAN READ would read text input from the terminal.

GKS handles input in a device-independent way by defining logical input devices. Segmentation: The task of manipulating parts of pictures leads to the concept of segmentation. A picture is composed of parts, called segments, which can be displayed, transformed, copied, or deleted independently of each other. Segments can be identified by an operator and their identification passed to the application program. GKS contains a very powerful segment facility, primarily because it provides a workstation-independent segment storage together with functions for sending copies of segments to workstations or into other segments.

Character spacing - Definition Space to be inserted between adjacent characters of a text string, in addition to the space defined by the font designer. , left aligned or centred). 4 gives examples of different values of character height, character up vector, expansion factor, path, spacing, and alignment. r.... 4 Examples of text attributes Interior style - Definition The interior style is used to determine the style in which an area should be filled. It has one of the values hollow, solid, pattern, or hatch.

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