CPBACK - Draws a background for a contour plot.

       To use CPBACK or c_cpback, 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_cpback (float *zdat, float *rwrk, int *iwrk)

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

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

UNIX                                               March 1993                                     CPBACK(3NCARG)

       All three arguments are arrays used in the last call to CPRECT, CPSPS1, or CPSPS2, the contents of which
       must not have been changed since that call.

       ZDAT        (REAL  array,  dimensioned as specified in the last call to CPRECT, CPSPS1, or CPSPS2, input)
                   is the data array.

       RWRK        (REAL array, dimensioned as specified  in  the  last  call  to  CPRECT,  CPSPS1,  or  CPSPS2,
                   input/output) is the real workspace array.

       IWRK        (INTEGER  array,  dimensioned  as  specified  in  the last call to CPRECT, CPSPS1, or CPSPS2,
                   input/output) is the integer workspace array.

       Use  the ncargex command to see the following relevant examples: ccpback, ccpcff, ccpcfx, ccpcis, ccpcit,
       ccpclc, ccpcld, ccpcldm, ccpcll, ccpclu, ccpdflt, ccpfil, ccphand, ccphcf, ccphl, ccphlt, ccpila, ccpils,
       ccpilt, ccpklb, ccplbam, ccplbdr, ccpline,  ccpllb,  ccpllc,  ccplll,  ccpllo,  ccpllp,  ccpllt,  ccpllw,
       ccpncls,  ccpnet, ccpnof, ccpnsd, ccppc, ccppc1, ccppc2, ccppc3, ccppc4, ccppkcl, ccprc, ccprect, ccprwc,
       ccprwu, ccpscam, ccpset, ccpsps1, ccpsps2, ccpspv, ccptitle, ccpvp, cidsfft, cpex01, fsfsgfa.

       See the conpack man page for a description of all Conpack error messages and/or informational messages.

       CPBACK - Draws a background for a contour plot.

       Online:  conpack, cpchcf, cpchcl, cpchhl, cpchil, cpchll, cpcica, cpclam, cpcldm, cpcldr, cpcltr, cpcnrc,
       cpdrpl, 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 CPBACK (ZDAT, RWRK, IWRK)

       You can call CPBACK at any time after the initialization call to CPRECT, CPSPS1, or CPSPS2.  What  CPBACK
       does depends on the value of the internal parameter 'MAP':

       •      If  'MAP'  is set to zero, CPBACK draws the perimeter of the current viewport by calling PERIM, in
              the utility Gridall, requesting 'ZDM'-1 major ticks on the horizontal sides of the  perimeter  and
              'ZDN'-1 major ticks on the vertical sides.  No minor ticks are drawn.

       •      If 'MAP' is set non-zero, CPBACK does nothing.