In general, knowing which utility a particular routine belongs to is only necessary when you need to look up its documentation in one of the manuals. In Version 3.2, these other utilities are the highest layer of NCAR Graphics, and will do the most work with the fewest number of calls. Other utilities, such as Conpack, Autograph, and Ezmap, frequently rely on you to make the right GKS and SPPS calls to work correctly. This utility was designed to do some of the things that GKS does with fewer calls. The next layer of NCAR Graphics is the SPPS utility. Things like setting up color tables and doing solid color fill are best done using GKS, so you will call GKS routines directly.
Because GKS is a standard, and all NCAR Graphics utilities rely on GKS to do the plotting, you can run NCAR Graphics with GKS packages from other vendors, or with the GKS package included in NCAR Graphics. The GKS standard also specifies the Fortran and C interfaces for its graphics functionality. NCAR has implemented the 0A level, and a few extensions from the 2B level. The GKS standard has been adopted by both ANSI and ISO, and can be implemented at one of 12 levels, depending on graphical input and output capabilities. GKS is a specification of how to implement basic functions for computer graphics programming, such as points, lines, text, fill areas, and portable raster images.
The NCAR Graphics utilities are built in layers, the lowest of which is GKS. Finally we'll show you how to apply those concepts to a C program. Once you understand the structure of NCAR Graphics, we will discuss writing a program in Fortran. Chapter 3: Writing a graphics program Chapter 3: Writing a graphics program Previous chapter LLUs Home Next chapter Indexīefore we can talk about the structure of a graphics program, we need to discuss the structure of NCAR Graphics.
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