System and Implementation Dependencies

As mentioned elsewhere in this document certain features of GKS and GKS-3D are system or implementation dependent. System dependencies are described in the manual appropriate for the implementation in use.

The principle implementation dependencies to watch for are text fonts and fill area hatch styles but it is also possible to have difficulties by inadvertently trying to exceed some maximum value, such as a table length. GKS has many inquiry function which may be used to discover the current and/or maximum value of various parameters, and it is not the intention of the Primer to describe all of them. However, one should take note of the following routines:

CALL GQWKM(ERRIND, MXOPWK, MXACWK, MXWKAS)
 
CALL GQMNTN(ERRIND, MAXTNR)
 
CALL GQLWK(WTYPE, ERRIND, MPLBTE, MPMBTE, MTXBTE, MFABTE, MPAI, MCOLI)
    or
CALL GQLWK3(WTYPE, ERRIND, MPLBTE, MPMBTE, MTXBTE, MFABTE, MPAI,
             MEDBTE, MCOLI, MVTE)
 
CALL GQSGP(WTYPE, ERRIND, NSGP)

WTYPE

workstation type (input parameter)

ERRIND

error number

MXOPWK

maximum number of simultaneously open workstations

MXACWK

maximum number of simultaneously active workstations

MXWKAS

maximum number of workstations associated with a segment

MAXTNR

maximum normalization transformation number

MPLBTE

maximum number of polyline bundle table entries

MPMBTE

maximum number of polymarker bundle table entries

MTXBTE

maximum number of text bundle table entries

MFABTE

maximum number of fill area bundle table entries

MPAI

maximum number of pattern indices

MEDBTE

maximum number of edge bundle table entries

MCOLI

maximum number of colour indices

MVTE

maximum number of view table entries

NSGP

maximum number of segment priorities