LWGEOM_asX3D()

Datum LWGEOM_asX3D

(

PG_FUNCTION_ARGS

)

TODO: we need to support UTM and other coordinate systems supported by X3D eventually http://www.web3d.org/documents/specifications/19775-1/V3.2/Part01/components/geodata.html#t-earthgeoids

Definition at line 333 of file lwgeom_export.c.

{
        GSERIALIZED *geom;
        LWGEOM *lwgeom;
        int version;
        int option = 0;
        int precision = OUT_DEFAULT_DECIMAL_DIGITS;
        static const char* default_defid = "x3d:"; /* default defid */
        char *defidbuf;
        const char* defid = default_defid;
        text *defid_text;
 
        /* Get the version */
        version = PG_GETARG_INT32(0);
        if (  version != 3 )
        {
                elog(ERROR, "Only X3D version 3 are supported");
                PG_RETURN_NULL();
        }
 
        /* Get the geometry */
        if ( PG_ARGISNULL(1) ) PG_RETURN_NULL();
        geom = PG_GETARG_GSERIALIZED_P(1);
 
        /* Retrieve precision if any (default is max) */
        if (PG_NARGS() >2 && !PG_ARGISNULL(2))
        {
                precision = PG_GETARG_INT32(2);
        }
 
        /* retrieve option */
        if (PG_NARGS() >3 && !PG_ARGISNULL(3))
                option = PG_GETARG_INT32(3);
 
 
        /* retrieve defid */
        if (PG_NARGS() >4 && !PG_ARGISNULL(4))
        {
                defid_text = PG_GETARG_TEXT_P(4);
                if ( VARSIZE_ANY_EXHDR(defid_text) == 0 )
                {
                        defid = "";
                }
                else
                {
                        /* +2 is one for the ':' and one for term null */
                        defidbuf = palloc(VARSIZE_ANY_EXHDR(defid_text)+2);
                        memcpy(defidbuf, VARDATA(defid_text),
                               VARSIZE_ANY_EXHDR(defid_text));
                        /* add colon and null terminate */
                        defidbuf[VARSIZE_ANY_EXHDR(defid_text)] = ':';
                        defidbuf[VARSIZE_ANY_EXHDR(defid_text)+1] = '\0';
                        defid = defidbuf;
                }
        }
 
        lwgeom = lwgeom_from_gserialized(geom);
 
        if (option & LW_X3D_USE_GEOCOORDS) {
                if (lwgeom->srid != 4326)
                {
                        PG_FREE_IF_COPY(geom, 0);
                        elog(ERROR, "Only SRID 4326 is supported for geocoordinates.");
                        PG_RETURN_NULL();
                }
        }
 
        PG_RETURN_TEXT_P(lwgeom_to_x3d3(lwgeom, precision, option, defid));
}

References LW_X3D_USE_GEOCOORDS, lwgeom_from_gserialized(), lwgeom_to_x3d3(), OUT_DEFAULT_DECIMAL_DIGITS, precision, and LWGEOM::srid.

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