NAME

       MAPITM - Draws lines on a map, masked by a specified area map.

SYNOPSIS

        CALL MAPITM (RLAT,RLON,IFST,IAMA,XCRA,YCRA,MCRA,IAAI,IAGI, + NOGI,ULPR)

       CALL MAPIQM (IAMA,XCRA,YCRA,MCRA,IAAI,IAGI,NOGI,ULPR)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

       void c_mapitm (float rlat, float rlon, int ifst,
       int *iama, float *xcra, float *ycra, int mcra,
       int *iaai, int *iagi, int nogi,
       int (*ulpr)(float *xcra, float *ycra, int *mcra,
       int *iaai, int *iagi, int *nogi))

       void c_mapiqm (int *iama, float *xcra, float *ycra,
       int mcra, int *iaai, int *iagi, int nogi,
       int ulpr(float *xcra, float *ycra, int *mcra,
       int *iaai, int *iagi , int *nogi))

       RLAT and RLON
                   (input expressions, of type REAL) specify the latitude and longitude of a
                   point to which the "pen" is to be moved. Both are given in degrees. RLAT must
                   be between -90. and +90., inclusive; RLON must be between -540. and +540.,
                   inclusive.

       IFST        (an input expression, of type INTEGER) is 0 to do a "pen-up" move, 1 to do a
                   "pen-down" move only if the distance from the last point to the new point is
                   greater than 'MV' plotter units, and 2 or greater to do a "pen-down" move
                   regardless of the distance from the last point to the new one.

       IAMA        (an input/output array of type INTEGER, dimensioned as specified in a call to
                   the AREAS initialization routine ARINAM) is the array containing the area map
                   against which lines drawn by MAPIQM will be masked.

       XCRA and YCRA
                   (scratch arrays of type REAL, each dimensioned MCRA) are to be passed by
                   MAPIQM to the AREAS routine ARDRLN, which uses them in calls to the user line-
                   processing routine ULPR. They will hold the X and Y coordinates of points in
                   the fractional coordinate system defining some portion of the projection of a
                   user-defined polyline on the globe.

       MCRA        (an input expression of type INTEGER) is the size of each of the arrays XCRA
                   and YCRA. The value of MCRA must be at least two. For most applications, the
                   value 100 works nicely.

       IAAI and IAGI
                   (scratch arrays of type INTEGER, each dimensioned NOGI) are to be passed by
                   MAPIQM to the AREAS routine ARDRLN, which uses them in calls to the user line-
                   processing routine ULPR. They will hold area identifier/group identifier pairs
                   for the area containing the polyline fragment defined by XCRA and YCRA.

       NOGI        (an input expression of type INTEGER) is the size of each of the arrays IAAI
                   and IAGI. The value of NOGI must be greater than or equal to the number of
                   groups of edges placed in the area map in IAMA.

       ULPR        is the name of a user-provided line-processing routine. This name must appear
                   in an EXTERNAL statement in the routine that calls MAPITM, so that the
                   compiler and loader will know that it is the name of a routine to be called,
                   rather than the name of a variable.

C-BINDING DESCRIPTION

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

USAGE

       The routines MAPITM and MAPIQM may be used to draw lines defined by a series of user-
       specified latitudes and longitudes on a map, masked by the areas defined by an area map
       (perhaps one created by a call to MAPBLA or perhaps one created by a set of calls to
       routines in the package AREAS); like MAPIT and MAPIQ, they attempt to omit non-visible
       portions of lines and to handle "cross-over".

       MAPITM is called like the EZMAP routine MAPIT (which see, above) but has some additional
       arguments:

            CALL MAPITM (RLAT,RLON,IFST,IAMA,XCRA,YCRA,MCRA,IAAI,
           + IAGI,NOGI,ULPR)

       Additional arguments are the area-map array IAMA, coordinate arrays XCRA and YCRA,
       dimensioned MCRA, integer arrays IAAI and IAGI, dimensioned NOGI, and a user-provided
       line-processing routine named ULPR. MAPIQM is called like the EZMAP routine MAPIQ, to
       terminate a series of calls to MAPITM and to flush the buffers; it has the same additional
       arguments:

           CALL MAPIQM (IAMA,XCRA,YCRA,MCRA,IAAI,IAGI,NOGI,ULPR)

       The additional arguments are passed by MAPITM and MAPIQM to the routine ARDRLN, in the
       package named AREAS.

       For more information, see the man page for the routine MAPIT.

EXAMPLES

       Use the ncargex command to see the following relevant example: cmpitm.

ACCESS

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

SEE ALSO

       Online: ezmap, ezmap_params, mapaci, mapbla, mapblm, mapdrw, mapeod, mapfst, mapgci,
       mapgrd, mapgrm, mapgtc, mapgti, mapgtl, mapgtr, mapint, mapiq, mapiqa, mapiqd, mapiqm,
       mapit, mapita, mapitd, maplbl, maplmb, maplot, mappos, maproj, maprs, maprst, mapsav,
       mapset, mapstc, mapsti, mapstl, mapstr, maptra, maptri, maptrn, mapusr, mapvec, mpchln,
       mpfnme, mpgetc, mpgeti, mpgetl, mpgetr, mpglty, mpiaty, mpifnb, mpilnb, mpiola, mpiosa,
       mpipai, mpipan, mpipar, mpisci, mplnam, mplndm, mplndr, mplnri, mpname, mprset, mpsetc,
       mpseti, mpsetl, mpsetr, supmap, supcon, ncarg_cbind

       Hardcopy: NCAR Graphics Contouring and Mapping Tutorial

COPYRIGHT

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