Accession Number:

ADA037564

Title:

GRAPHELP User's Manual: Version 2.

Descriptive Note:

Technical memo.,

Corporate Author:

HARRY DIAMOND LABS ADELPHI MD

Personal Author(s):

Report Date:

1977-03-01

Pagination or Media Count:

58.0

Abstract:

An interactive-graphics, minicomputer-based, FORTRAN IV, software package called GRAPHELP has been developed. The current GRAPHELP software package has working versions implemented on three different minicomputer systems providing interactive graphics support for all Tektronix 401X graphics storage tube terminals and the Imlac PDS-4 refresh graphics display system. The software package provides both absolute and relative vectors of four varying line textures, user definable scaling, windowing, clipping, terminal transparency, and 128 nested subpicture display files for refresh graphics. In addition, routines are provided for interactive graphics crosshair input, interactive screen erase control, and selective erase to aid users in building their own interactive graphics display programs with GRAPHELP as the foundation. For those applications that are oriented toward data plotting rather than picture drawing, axes and scaling routines for both linear and logarithmic data are provided, along with alphabetic and numeric symbol output. This document both describes the software capabilities and provides instructions on its use. Author

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE