FtnGfxPkg FortranRef

This document is the DECgraphic-11 FORTRAN Reference Manual, first printed in November 1976 by Digital Equipment Corporation. It serves as a comprehensive guide for PDP-11 FORTRAN programmers working with DECgraphic-11 software on VT11 and VS60 graphic display systems, specifically under RT-11 or RSX-11M operating environments.

The manual outlines the system's capabilities, its hardware/software environment, and fundamental graphics concepts such as display screens, display files, and interactive elements. Its core content is a detailed description of the FORTRAN-callable subroutines, categorized by function, which allow users to:

• Initialize and Control the display file.
• Set Screen and Scaling Parameters for coordinate systems and windows.
• Generate Graphics Primitives like points, vectors, and character strings (with varied attributes such as line types, intensity levels, blink mode, italic, rotated, extended characters, subscripts, and superscripts).
• Define and Utilize Subpictures for creating reusable graphic entities.
• Display Graphs and Figures.
• Manage Display File Pointers for dynamic modification of graphic elements.
• Facilitate Light Pen Interaction including tracking objects.
• Perform Display File Utility Functions such as compressing, saving, and restoring files.
• Execute Advanced Display File Functions for experienced users.

Additionally, the manual provides programming techniques for efficiency, detailed instructions for building DECgraphic-11 libraries and linking user programs within RT-11 and RSX-11M operating environments, and includes appendices with a subroutine summary, error messages, display file structure, a FORTRAN programming example, and comparisons to earlier graphics extension packages. A glossary of graphics terms is also included.