Name:         GRMARK

Purpose:      mark points with specified symbol

Category:     GRAPHICS

File:         pgplot.src

Author:       T.J. Pearson

Use:          see description below.

Description:

            SUBROUTINE GRMARK (IDENT,CENTER,SYMBOL,ABSXY,POINTS,X,Y)
      
       GRPCKG: mark a sequence of points with a specified symbol. The
       plot is windowed in the current subarea.
      
       Arguments:
      
       IDENT (integer, input): plot identifier from GROPEN.
       CENTER (input, logical): if .TRUE. the symbol is centered on the point,
            otherwise the bottom left corner is placed at the point.
       SYMBOL (byte or integer, input): code number of symbol in range 0-127
            (ASCII character or special symbol); if SYMBOL is outside this
            range, nothing is plotted.
       ABSXY (logical, input): if .TRUE. (X,Y) are absolute (device)
            coordinates; otherwise they are world coordinates and the
            scaling transformation is applied.
       POINTS (integer, input): the number of points; if POINTS is less than
            or equal to 0, nothing is plotted.
       X,Y (real arrays, dimension at least POINTS, input): the coordinate
            pairs; if POINTS=1, these may be scalars instead of arrays.
      
       (9-Mar-1983)

Updates:      Oct 16, 1998: JPT automatically extracted from source.