DECUS Heritage

Version: 1.2, May 1991
Submitted By: Richard Desper, Army Materials Technology Lab
Operating System: VAX/VMS, MicroVMS
Source Language: VAX FORTRAN
Keywords: Graphics
Hardware Requirements: VT125 Series Terminal
Notes: The following DIGITAL graphics printers are optional devices supported by VAX RGL, Version 1.2: LA12, LA34-VA, LA50, LA100, LA210, and LN03 PLUS. With one of these printers attached to a VT125 video terminal, VAX RGL can then be instructed to print a copy of the graphics screen on the hardcopy printer. An RGB color monitor is an optional device that can be attached to the VT125. VAX RGL provides independent control over the colors on the RGB monitor and the gray shades on the VT125 video terminal. Program operating under VAX/VMS Version 4.6 was last legal certification. For VAX systems, VAX/VMS operating system and VAX FORTRAN are required. For MicroVAX Systems (I and II), VAX FORTRAN and both the MicroVMS Extended Base component and the MicroVMS Program Development component are required. Files for fixes for the VT240 terminal have not been included.
Changes & Improvements: Includes an installation command file. Corrected calling names provided for ten subroutines. Example and Library source files placed in separate directories.

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Abstract: VAX ReGIS Graphics Library (RGL) is a software package that consists of picture-drawing and data-plotting routines.

Picture Drawing Capabilities

• Control - Initializes and controls parameters. Sets various flags within VAX RGL determining, for example, whether angular data can be passed as degrees or radians, or whether error messages can be printed on the terminal.
• Screen Control - Defines viewports on the terminal and provides methods of clearing various portions of the screen.
• Attribute Control - Controls terminal attributes such as shading, line patterns, and writing modes.
• Picture Objects - Draws various picture objects, such as lines, markers, boxes, arcs, circles, and regular polygons on the screen.
• Transformations - Provides a set of two-dimensional transformations including rotation, translation, and scaling, both singly and in combination.
• Graphic Text - Controls text parameters, such as size and placement.
• Saving or Restoring Pictures - Copies various portions of the screen to the optional graphics printer and provides a method of saving ReGIS strings for later recall.
• Locators - Returns the current screen position in the user's coordinate system and allows points on the screen to be digitized.
• Color Support - The user can define up to 64 colors and reference them by name. The system provides eleven predefined colors and gray scales. Four out of 64 colors can be displayed simultaneously via a slave color monitor to the VT125.
• Alternate Character Set - Loads and uses alternate character sets. English and Greek character fonts are provided.
• Macrograph Support - Accesses ReGIS macrograph facilities.

Data Plotting Capabilities

• The data plotting facilities define and label graph "paper" on the screen. The plotting subroutines are divided into static and dynamic segments. Static routines display all the user's data in one call. Dynamic routines allow point plotting (data added to a previously defined graph "paper") and continuous display mode (data scrolled left or right).
• Setting Graph "Paper" - Defines any of the following graph "papers": linear, logarithmic, polar, or probability.
• Labeling and Scaling Axes - Performs numeric and alphanumeric labeling and scaling of the axes.
• Data Plotting - Plots data arrays, points with optional auto scaling, strip charts, and bar charts.
• Cursor Support - Digitizes information within the graph "paper". The cursors are moved by arrow keys on the keyboard.

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Last Update: Thu Jan 11 18:34:45 1996