                Chapter 3: Introductory Routines

3.1 Initialization and Termination

DISINI initializes  DISLIN by setting default parameters and
creating a plotfile.  The level is set to 1.  DISINI must be
called before  any other  DISLIN  routine  except  for those
noted throughout the manual.

The call is:  CALL DISINI                            level 0

DISFIN terminates DISLIN and prints a message on the screen.
The level is set back to 0.

The call is:  CALL DISFIN                      level 1, 2, 3

3.2 Plotting of Text and Numbers

                         M E S S A G
MESSAG plots text.

The call is:  CALL MESSAG (CSTR, NX, NY)       level 1, 2, 3

CSTR          is a character string (<= 256 characters).
NX, NY        are the  plot coordinates of the upper left
              corner.

                         N U M B E R

NUMBER plots a floating-point number or integer.

The call is:  CALL NUMBER (X, NDIG, NX, NY)    level 1, 2, 3

X            is a floating-point number.
NDIG         is the number of digits plotted after the deci-
             mal point.  If NDIG = -1,  X will be plotted as
             an integer. The last digit of X will be rounded
             up.
NX, NY       are the coordinates of the upper left corner.

RLMESS and RLNUMB are corresponding routines  for user coor-
dinates. They can be used for  plotting text  and numbers in
an axis system after a call to GRAF.

The calls are:  CALL RLMESS (CSTR, XP, YP)        level 2, 3
                CALL RLNUMB (X, NDIG, XP, YP)     level 2, 3

Notes:    -  To continue  character strings  and numbers  on
             the  same  line,  the  coordinates   (999, 999)
             should be sent to MESSAG  and NUMBER.  The text
             or numbers will be plotted after the last plot-
             ted text character or number.
          -  The angle and height of the  characters  can be
             changed with the routines ANGLE and HEIGHT.
          -  The format of numbers can be modified with  the
             routines NUMFMT and NUMODE.
          -  Text and numbers can be plotted in a box if the
             routine FRMESS is used.
          -  The starting point  of text and numbers  can be
             interpreted as upper left, upper center and up-
             per right point if the routine TXTJUS is used.

3.3 Plotting Symbols

                         S Y M B O L

The routine SYMBOL plots symbols.

The call is:  CALL SYMBOL (NSYM, NX, NY)       level 1, 2, 3

NSYM          is a symbol number between 0 and 21. Available
              symbols are given in the Appendix B.
NX, NY        is the centre of the  symbol in plot coordina-
              tes.

Notes:     -  The size of symbols can be set with HSYMBL.
           -  SYMROT  (ANGLE) defines a  rotation  angle for
              symbols (in degrees). The symbol is rotated in
              a counter-clockwise direction.

                         R L S Y M B

RLSYMB plots a symbol  where the centre is specified by user
coordinates.

The call is:  CALL RLSYMB (NSYM, XP, YP)          level 2, 3

3.4 Plotting a Page Border and Header

                         P A G E R A

PAGERA plots a border around the page.

The call is:  CALL PAGERA                      level 1, 2, 3

                         P A G H D R

PAGHDR plots a page header at a corner of the page. The hea-
der line contains date, time and user-defined information.

The call is:  CALL PAGHDR (CSTR1, CSTR2, IOPT, IDIR)
                                               level 1, 2, 3
CSTR1         is a  character string  preceding  the  header
              line.
CSTR2         is a  character string  following  the  header
              line.
IOPT          is the  page corner  where the header is plot-
              ted:
       = 1    is the lower left corner.
       = 2    is the lower right corner.
       = 3    is the upper right corner.
       = 4    is the upper left corner.
IDIR          is the direction of the header line:
       = 0    is horizontal.
       = 1    is vertical.

Note:         The character size of the header line is 0.6 *
              NH where NH is the parameter used in HEIGHT.

3.5 Sending a Metafile to a Device

A metafile can be converted  with a driver program  and sent
from the operating system to several devices. From within  a
user program, the SYMFIL routine is used for this purpose.

                         S Y M F I L

SYMFIL sends a metafile to a device. It must be called after
DISFIN.

The call is:  CALL SYMFIL (CDEV, CSTAT)              level 0

CDEV          is the name  of the device.  'CONS' refers  to
              the  graphics screen,  'XWIN'  to an  X Window
              terminal,  'PSCi'  to  a  PostScript  printer,
              'KYOi'  to a  Kyocera  laserprinter  with Pre-
              scribe and 'HPLi' to a HP-plotter. The keyword
              'NONE' can be used  to delete a  metafile with
              no device plotting.
CSTAT         is a status parameter and can have  the values
              'DELETE' and 'KEEP'.

3.6 Including Metafiles into a Graphics

A metafile can be included  into a graphics with the routine
INCFIL.

                         I N C F I L

The routine INCFIL includes a  GKSLIN or CGM metafile into a
graphics.

The call is:  CALL INCFIL (CFIL)               level 1, 2, 3

CFIL          is a  character string that contains the file-
              name.

Notes:     -  The routine  FILBOX (NX, NY, NW, NH) defines a
              rectangular area  on the page  where the meta-
              file will be included.  (NX, NY)  are the plot
              coordinates of the upper left corner, (NW, NH)
              are the  width and  length of the  box in plot
              coordinates. By default, the entire page  will
              be used.
           -  With the statement  CALL FILCLR ('NONE'),  co-
              lour values in a metafile will be ignored. The
              default is FILCLR ('ALL').

