LINE - draws a line from the point (X1,Y1) to the point (X2,Y2). The "pen" (for subsequent calls to

       To use LINE or c_line, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that
       order.

       The C-binding argument descriptions are the same as the FORTRAN argument descriptions.

       #include <ncarg/ncargC.h>

       void c_line (float x1, float y1, float x2, float y2)

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                       LINE(3NCARG)

       X1          (an  input  expression of type REAL) defines the X user coordinate of the starting point of a
                   line segment.

       Y1          (an input expression of type REAL) defines the Y user coordinate of the starting point  of  a
                   line segment.

       X2          (an  input  expression  of  type REAL) defines the X user coordinate of the ending point of a
                   line segment.

       Y2          (an input expression of type REAL) defines the Y user coordinate of the  ending  point  of  a
                   line segment.

       Use the ncargex command to see the following relevant examples: mpex07, mpex09, cbex01,  coex01,  coex03,
       epltch, srex01, and tgflas.

       LINE - draws a line from the point (X1,Y1) to the point (X2,Y2).  The "pen" (for subsequent calls to
       FRSTPT, VECTOR, PLOTIF, and PLOTIT) is left at (X2,Y2).

       Online: gpl, gsln, gslwsc, gscr, gsplci, spps, spps_params, frstpt, vector, plotif, curve, ncarg_cbind

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version; User's Guide for NCAR GKS-0A Graphics

       CALL LINE (X1,Y1,X2,Y2)

       Polyline  type,  line  width,  and  color  can be set by calling the GKS routines GSLN, GSLWSC, GSCR, and
       GSPLCI before calling LINE.

       This routine flushes the SPPS polyline buffer at each line draw.  Thus, polyline attributes can be safely
       changed between successive calls.