GDDM-GKS

GDDM V3R2 General Information

GDDM-GKS

GDDM V3R2 General Information
GC33-0866-03

GKS, the Graphical Kernel System, is a programming interface defined by a standard, ISO 7942, of the International Organization for Standardization. GDDM-GKS implements Level 2b of this standard (with some minor differences). Where the standard states that a facility is either implementation-defined or undefined, GDDM-GKS follows the ANSI GKS standard.

GDDM-GKS provides a similar range of text, interactive, and output graphics functions to the GDDM Base programs. The coding of device-independent programs in GDDM-GKS is particularly straightforward.

An advantage of a standard application programming interface, such as GDDM-GKS, is that programs can be transported in source form between systems that have different implementations of the standard. It also eases the work of programmers who move from one such system to another and, because it uses widely accepted computer-graphics concepts, eases communication between programmers.

GDDM-GKS runs under TSO, MVS/Batch, TSO/Batch, and CMS. The API is based on the ANSI GKS FORTRAN language binding. Programs can also be coded in PL/I, COBOL, System/370 Assembler, APL2, and BASIC. GKS calls can be mixed with most other GDDM calls, except the GDDM Base graphics calls.

GDDM-GKS supports input to, and output from, the full range of IBM 3270 (and 3270-emulating) displays, printers, and plotters supported by the GDDM Base programs.

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