GDDM-GKS V1R1 Programming Guide and Reference
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Utility functions

GDDM-GKS V1R1 Programming Guide and Reference
SC33-0334-00 




   GKS provides four utility functions to help you to compute transformation
   matrixes and to process packed data records:
  • Evaluate transformation matrix (GEVTM) computes segment transformation matrixes from input values for shift, rotation, and scale.
  • Accumulate transformation matrix (GACTM) composes a new matrix from an input transformation matrix plus new input values for shift, rotation, and scale.
  • Pack data record (GPRECS) accepts individual unpacked elements of a data record, and returns them in packed format.
  • Unpack data record (GURECS) performs the inverse of the Pack data record (GPRECS) function.
Packed data records are required by the input functions that initialize logical input devices.
Transformation matrixes are required as input parameters for Set segment transformation (GSSGT) and Insert segment (GINSG).

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