TDLINE - Given the coordinates of two points in 3-space, draw the projection of the line joining them.

       To  use TDLINE or c_tdline, 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_tdline(float ucp1, float vcp1, float wcp1, float ucp2, float vcp2, float wcp2)

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

UNIX                                                July 1997                                     TDLINE(3NCARG)

       The arguments of TDLINE are as follows:

       UCP1, VCP1, and WCP1
               (input expressions of type REAL) - the coordinates of a point in 3-space.

       UCP2, VCP2, and WCP2
               (input expressions of type REAL) - the coordinates of another point in 3-space.

       TDLINE - Given the coordinates of two points in 3-space, draw the projection of the line joining them.

       Online: tdclrs, tdctri, tddtri, tdgeti, tdgetr, tdgrds, tdgrid, tdgtrs, tdinit, tditri,  tdlbla,  tdlbls,
       tdlnpa,  tdmtri,  tdotri,  tdpack, tdpack_params, tdpara, tdplch, tdprpa, tdprpi, tdprpt, tdseti, tdsetr,
       tdsort, tdstri, tdstrs

       CALL TDLINE (UCP1, VCP1, WCP1, UCP2, VCP2, WCP2)