Graphical Data Display Manager: Difference between revisions

Revision as of 14:15, 8 November 2008

Revision as of 07:46, 24 November 2008

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GDDM also provided support for the (then current) international standards for interactive computer graphics: [[GKS]] and [[PHIGS]]. Both GKS and PHIGS were designed around the requirements of CAD systems.

GDDM comprises a number of components:

* Graphics primitives - lines, circles, boxes etc.

* Graphing - through the Presentation Graphics Feature (PGF)

* Language support - PL/I, REXX, COBOL etc

* Conversion capabilities - for example to GIF format.

GDDM remains in widespread use today, embedded in many [[z/OS]] applications, as well as in System programs.

==GDDM and OS/2 Presentation Manager==

When [[IBM]] and [[Microsoft]] began collaborating on the design of [[OS/2]] in 1986 the Graphics Presentation Interface (GPI) which was the graphics [[API]] in Presentation Manager was based on IBM's GDDM and the Graphics Control Program (GCP). GCP was originally developed in Hursley for the 3270/PC-G and 3270/PC-GX terminals.