wkt_pointarray_dimensionality()

static int wkt_pointarray_dimensionality ( POINTARRAY *  pa, uint8_t  flags  )

static

Read the dimensionality from a flag, if provided.

Then check that the dimensionality matches that of the pointarray. If the dimension counts match, ensure the pointarray is using the right "Z" or "M".

Definition at line 183 of file lwin_wkt.c.

References POINTARRAY::flags, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_NDIMS, FLAGS_SET_M, FLAGS_SET_Z, LW_FALSE, LW_TRUE, and LWDEBUGF.

Referenced by wkt_parser_circularstring_new(), wkt_parser_linestring_new(), wkt_parser_point_new(), and wkt_parser_triangle_new().

{
        int hasz = FLAGS_GET_Z(flags);
        int hasm = FLAGS_GET_M(flags);
        int ndims = 2 + hasz + hasm;

        /* No dimensionality or array means we go with what we have */
        if( ! (flags && pa) )
                return LW_TRUE;

        LWDEBUGF(5,"dimensionality ndims == %d", ndims);
        LWDEBUGF(5,"FLAGS_NDIMS(pa->flags) == %d", FLAGS_NDIMS(pa->flags));

        /*
        * ndims > 2 implies that the flags have something useful to add,
        * that there is a 'Z' or an 'M' or both.
        */
        if( ndims > 2 )
        {
                /* Mismatch implies a problem */
                if ( FLAGS_NDIMS(pa->flags) != ndims )
                        return LW_FALSE;
                /* Match means use the explicit dimensionality */
                else
                {
                        FLAGS_SET_Z(pa->flags, hasz);
                        FLAGS_SET_M(pa->flags, hasm);
                }
        }

        return LW_TRUE;
}

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