GenerateLineStringGeometry()

int GenerateLineStringGeometry	(	SHPLOADERSTATE *	state,
		SHPObject *	obj,
		char **	geometry
	)

Generate an allocated geometry string for shapefile object obj using the state parameters.

Definition at line 318 of file shp2pgsql-core.c.

{
 
        LWGEOM **lwmultilinestrings;
        LWGEOM *lwgeom = NULL;
        POINT4D point4d;
        int dims = 0;
        int u, v, start_vertex, end_vertex;
        char *mem;
        size_t mem_length;
 
 
        FLAGS_SET_Z(dims, state->has_z);
        FLAGS_SET_M(dims, state->has_m);
 
        if (state->config->simple_geometries == 1 && obj->nParts > 1)
        {
                snprintf(state->message, SHPLOADERMSGLEN, _("We have a Multilinestring with %d parts, can't use -S switch!"), obj->nParts);
 
                return SHPLOADERERR;
        }
 
        /* Allocate memory for our array of LWLINEs and our dynptarrays */
        lwmultilinestrings = malloc(sizeof(LWPOINT *) * obj->nParts);
 
        /* We need an array of pointers to each of our sub-geometries */
        for (u = 0; u < obj->nParts; u++)
        {
                /* Create a ptarray containing the line points */
                POINTARRAY *pa = ptarray_construct_empty(state->has_z, state->has_m, obj->nParts);
 
                /* Set the start/end vertices depending upon whether this is
                a MULTILINESTRING or not */
                if ( u == obj->nParts-1 )
                        end_vertex = obj->nVertices;
                else
                        end_vertex = obj->panPartStart[u + 1];
 
                start_vertex = obj->panPartStart[u];
 
                for (v = start_vertex; v < end_vertex; v++)
                {
                        /* Generate the point */
                        point4d.x = obj->padfX[v];
                        point4d.y = obj->padfY[v];
 
                        if (state->has_z)
                                point4d.z = obj->padfZ[v];
                        if (state->has_m)
                                point4d.m = obj->padfM[v];
 
                        ptarray_append_point(pa, &point4d, LW_FALSE);
                }
 
                /* Generate the LWLINE */
                lwmultilinestrings[u] = lwline_as_lwgeom(lwline_construct(state->from_srid, NULL, pa));
        }
 
        /* If using MULTILINESTRINGs then generate the serialized collection, otherwise just a single LINESTRING */
        if (state->config->simple_geometries == 0)
        {
                lwgeom = lwcollection_as_lwgeom(lwcollection_construct(MULTILINETYPE, state->from_srid, NULL, obj->nParts, lwmultilinestrings));
        }
        else
        {
                lwgeom = lwmultilinestrings[0];
                lwfree(lwmultilinestrings);
        }
 
        if (!state->config->use_wkt)
                mem = lwgeom_to_hexwkb(lwgeom, WKB_EXTENDED, &mem_length);
        else
                mem = lwgeom_to_wkt(lwgeom, WKT_EXTENDED, WKT_PRECISION, &mem_length);
 
        if ( !mem )
        {
                snprintf(state->message, SHPLOADERMSGLEN, "unable to write geometry");
                return SHPLOADERERR;
        }
 
        /* Free all of the allocated items */
        lwgeom_free(lwgeom);
 
        /* Return the string - everything ok */
        *geometry = mem;
 
        return SHPLOADEROK;
}

References _, shp_loader_state::config, FLAGS_SET_M, FLAGS_SET_Z, shp_loader_state::from_srid, shp_loader_state::has_m, shp_loader_state::has_z, LW_FALSE, lwcollection_as_lwgeom(), lwcollection_construct(), lwfree(), lwgeom_free(), lwgeom_to_hexwkb(), lwgeom_to_wkt(), lwline_as_lwgeom(), lwline_construct(), POINT4D::m, malloc(), shp_loader_state::message, MULTILINETYPE, SHPObject::nParts, SHPObject::nVertices, SHPObject::padfM, SHPObject::padfX, SHPObject::padfY, SHPObject::padfZ, SHPObject::panPartStart, ptarray_append_point(), ptarray_construct_empty(), SHPLOADERERR, SHPLOADERMSGLEN, SHPLOADEROK, shp_loader_config::simple_geometries, shp_loader_config::use_wkt, WKB_EXTENDED, WKT_EXTENDED, WKT_PRECISION, POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by ShpLoaderGenerateSQLRowStatement().

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