The Integrated Graphics System for the IBM 2250.

A programmer's manual for IGS, the RAND interactive computer graphic software, as implemented on the IBM 2250 graphic hardware. Programmed in FORTRAN IV with special facility for addressing a single character directly, IGS is machine-independent and callable from many languages acceptable to an IBM 360, including PL/I. The 360 can only start or stop the 2250 and read or write into it. The user controls the system through the 2250's online typewriter, light pen, or function keys; or by writing or drawing on the RAND Tablet, if included; or by touching user-defined sensitive areas with the light pen or Tablet stylus. Only parameters of interest need to be specified; IGS automatically provides default values for character size, spacing, line spacing, and other format details. IGS accepts user coordinates and translates them into raster units. It automatically rescales graphical data to fit available space, converts graphical to numerical data, etc. One subroutine draws an entire graph to fit given data, with a single call. The Memorandum includes an alphabetical index, a cross-reference index of subroutine calls, and a listing by type, as well as a detailed description of each. 175 pp. Ref.