Notes on modifying the graphics library interface routines (subdirectories
DISSPLA, IRIS, IRIS2, or GRAFIX) of PLOT3D for another device or library.

Written 28 May 1986 for PLOT3D Version 3.4.


GRAPHICS ROUTINES
-----------------

Called from other subdirectories:
   Begin/end plot:                 BGN2D,BGN2S,BGN3D,BGN3S,ENDPLT,DONPLT
   Begin/end object:               BGNOBJ,ENDOBJ
   Axis scaling & translation:     AXISC2,AXISC3,AXITR2,AXITR3
   Set attributes:                 ARRSCL,ARRSIZ,ARRTYP,COLNAM,COLRGB,LINSTY,
                                   LINWID,POLFIL,POLSUR,SYMSIZ,SYMTYP,VECLEN,
                                   VECSCL
   Contour colors & bar on plot:   CCMAP,CONCLR,CCBAR
   Drawing routines:               LINE2,LINE3,POINT2,POINT3,POLY2,POLY3,
                                   VECTO2,VECTO3
   Special for 2D contour lines:   BGNCO2,CLINE2,ENDCO2
   Commons:                        /GRIDS/,/FUNC/,/CONT/,/CONATT/,/FSUR/,
                                   /VPNT/,/MINM/,/VIEWAX/,/TEXT/,/PLTOPT/,
                                   /VARIAB/,/VARIAC/,/CHPK/

Called internally:
   Title & additional text:        TIXPLT,ADXPLT,GRXPLT,QHXPLT
   Axis generation and labelling:  AXES2D,AXES3D
   3D viewpoint:                   VIEWPT
   Color conversion:               NAMRGB,RGBHSI
   Device initialization:          INIPLT,PLTDEV
     DISSPLA:                      COMDIS,DICDIS,DIPDIS,ENVDIS,QMSDIS,TEKDIS,
                                   TK4DIS,VERDIS
     IRIS, IRIS2:                  IRIS,INILIN,INIPAT,INIPXF,INITXF,INICTB,
                                   COLTBL,TBL2,TBL4,TBL6,TBL8,BL10,TBL12
     GRAFIX:                       GRAFIX
   Shading (IRIS(2) & GRAFIX):     CTROID,PSHADE
   Mouse & button handling (IRIS(2)):
                                   INIQUE,EXEQUE,EXEDL,ENDQUE,ZBFTGL
   Text processing (DISSPLA lookalikes) (IRIS(2)):
                                   MESSAG,HEADIN,INTNO,REALNO
   Script routines (IRIS(2)):      PLTINT,PLTSCR,GOSCR,GOSC1,GOSC2,VPTSCR,
                                   INISCR,HLDSCR,CTRSCR
   Coordinate conversions (IRIS(2)):
                                   PTRDAI,PTRXYZ,XYZPTR,XYZDAI
   Viewport, clipping, viewing transformations (IRIS(2)):
                                   SETVPO,SETNF,UPDPXF
   Screen dump (IRIS(2)):          DUMPQM,QMSDMP,SCRDMP
   Commons:                        /CCLMAP/,/DISP/
     DISSPLA:                      /DISVEC/,/DISAX2/,/DISAX3/,/DISDEV/,
                                   /DISLIN/,/DISTMP/,/DISCON/,/DISOPT/,/DMINF/
     IRIS(2):                      /IRSVEC/,/IRSSC3/,/IRSMSE/,/IRSOBJ/,
                                   /IRSMOD/,/IRSCLR/,/IRSCTB/,/SCRI/,/IRSINF/,
                                   /IRSMMX/,/IRSVPT/,/IRSLIN/,/IRSPOL/,
                                   /IRSTMP/,/IRSXFM/,/IRSZBF/
     GRAFIX:                       /GRAVEC/,/GRAMMX/,/GRAINF/,/GRAVPT/,
                                   /GRAAX2/,/GRAAX3/,/GRALIN/,/GRACLR/,
                                   /GRATMP/
