By Dr. Günter Enderle, Dr. Klaus Kansy, Dr. Günther Pfaff (auth.)
TO special effects dependent ONGKS half I offers an advent to easy techniques of machine graph ics and to the foundations 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 response to GKS, and to provide the pc pictures professional an introduc tion to the GKS regular. within the early chapters of this half, the most parts of special effects, a few of the sessions of com puter snap shots clients, the interfaces of GKS and its underlying layout ideas are mentioned and demanding phrases are outlined. The later chapters provide an off-the-cuff creation to the most techniques of GKS and their interrelationships: output, attributes, coordinate platforms, variations, enter, segments, metafile, kingdom lists, and mistake dealing with. This creation to the GKS framework will arrange the floor for the precise description of second GKS features partly III and the 3D extensions to GKS partly IV. 1 what's special effects? 1. 1 Defmition of special effects the information Processing Vocabulary of the foreign association for Stan dardization (ISO) [ISO eighty four] defines special effects as follows: "Methods and methods for changing facts to and from a image exhibit through computing device. " This definition refers to 3 simple elements of any special effects process - specifically "data", "computer", and "display".
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Additional resources for Computer Graphics Programming: GKS — The Graphics Standard
VALUATOR: provides a real number. , by adjusting a potentiometer or by entering a number into a keyboard). CHOICE: provides a non-negative integer which represents a selection from a number of choices. , by pressing one of a number of buttons or by pointing at one of the items of a menu). PICK: provides a segment name and a pick identifier. , he may use a lightpen or may position the crosshair with a joystick to point to a primitive on the screen). Pick identifiers are explained in Chapter 11. STRING: provides a character string.
A workstation might, for example, consist of a plotter or a display with a keyboard or a tablet connected to it. The workstation concept is one of the original contributions of GKS to the methodology of graphics system design. Input: In order to be able to communicate with a workstation operator, the application program has to be provided with a means of obtaining input from a workstation. Besides dealing with input that is specific to graphical applications (coordinate data or the identification of a part of a picture), GKS also handles alphanumeric input, selection devices like function keys, and value-delivering devices like potentiometer dials.
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. S gives examples of different interior styles. This figure was generated on a black and white raster plotter. Examples of fill areas of different interior styles generated on a colour raster workstation are shown in Figure C2 (page 618). Fill areas with interior style SOLID were used to create Figures C4 (page 619) and CS (page 620).