CPDRPL - Provides a useful polyline-drawer for the routine CPCLDM.

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

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                     CPDRPL(3NCARG)

       XCS         (a  REAL  array of dimension at least NCS, input) is an array containing the X coordinates of
                   NCS points defining a polyline.

       YCS         (a REAL array of dimension at least NCS, input) is an array containing the Y  coordinates  of
                   NCS points defining a polyline.

       NCS         (INTEGER, input) is the number of points defining the polyline.

       IAI         (an  INTEGER  array of dimension at least NAI, input) is an array of area identifiers for the
                   area in which the polyline lies. For each I from 1 to NAI, IAI(I) is the area  identifier  of
                   the area with respect to the edge group IAG(I).

       IAG         (an INTEGER array of dimension at least NAI, input) is an array of group identifiers. See the
                   description of IAI, above.

       NAI         (INTEGER,  input)  is the number of area identifiers in the array IAI and the number of group
                   identifiers in the array IAG.

       CPDRPL - Provides a useful polyline-drawer for the routine CPCLDM.

       Online:  conpack, cpback, cpchcf, cpchcl, cpchhl, cpchil, cpchll, cpcica, cpclam, cpcldm, cpcldr, cpcltr,
       cpcnrc, cpezct, cpgetc, cpgeti, cpgetr, cplbam, cplbdr, cpmpxy, cpmviw, cpmvrw, cppkcl,  cppklb,  cprect,
       cprset, cpscae, cpsetc, cpseti, cpsetr, cpsps1, cpsps2, ncarg_cbind

       Hardcopy: NCAR Graphics Contouring and Mapping Tutorial

       CALL CPDRPL (XCS, YCS, NCS, IAI, IAG, NAI)

       If CPCLDM is called, and the only object of using it, instead of CPCLDR, to  draw  contour  lines  is  to
       avoid drawing the lines through labels, then, in the routine which calls CPCLDM, put the declaration

            EXTERNAL CPDRPL

       and,  in  the  call to CPCLDM, use CPDRPL for the argument RTPL. Each time CPDRPL is called, it draws the
       polyline defined by its first three arguments if, and only if, none of the area  identifiers  defined  by
       the other three arguments is negative.