geography_point_outside()

Datum geography_point_outside

(

PG_FUNCTION_ARGS

)

Definition at line 688 of file geography_measurement.c.

{
        GBOX gbox;
        GSERIALIZED *g = NULL;
        GSERIALIZED *g_out = NULL;
        size_t g_out_size;
        LWGEOM *lwpoint = NULL;
        POINT2D pt;
 
        /* Get our geometry object loaded into memory. */
        g = PG_GETARG_GSERIALIZED_P(0);
 
        /* We need the bounding box to get an outside point for area algorithm */
        if ( gserialized_get_gbox_p(g, &gbox) == LW_FAILURE )
        {
                POSTGIS_DEBUG(4,"gserialized_get_gbox_p returned LW_FAILURE");
                elog(ERROR, "Error in gserialized_get_gbox_p calculation.");
                PG_RETURN_NULL();
        }
        POSTGIS_DEBUGF(4, "got gbox %s", gbox_to_string(&gbox));
 
        /* Get an exterior point, based on this gbox */
        gbox_pt_outside(&gbox, &pt);
 
        lwpoint = (LWGEOM*) lwpoint_make2d(4326, pt.x, pt.y);
        /* TODO: Investigate where this is used, this was probably not
        * returning a geography object before. How did this miss checking
        */
        lwgeom_set_geodetic(lwpoint, true);
        g_out = gserialized_from_lwgeom(lwpoint, &g_out_size);
        SET_VARSIZE(g_out, g_out_size);
 
        PG_FREE_IF_COPY(g, 0);
        PG_RETURN_POINTER(g_out);
 
}

References gbox_pt_outside(), gbox_to_string(), gserialized_from_lwgeom(), gserialized_get_gbox_p(), LW_FAILURE, lwgeom_set_geodetic(), lwpoint_make2d(), POINT2D::x, and POINT2D::y.

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