lwmline_locate_along()

static LWMPOINT* lwmline_locate_along ( const LWMLINE *  lwmline, double  m, double  offset  )

static

Definition at line 148 of file lwlinearreferencing.c.

{
        LWMPOINT *lwmpoint = NULL;
        LWGEOM *lwg = lwmline_as_lwgeom(lwmline);
        uint32_t i, j;
 
        /* Return degenerates upwards */
        if ( (!lwmline) || (lwmline->ngeoms < 1) ) return NULL;
 
        /* Construct return */
        lwmpoint = lwmpoint_construct_empty(lwgeom_get_srid(lwg), lwgeom_has_z(lwg), lwgeom_has_m(lwg));
 
        /* Locate along each sub-line */
        for ( i = 0; i < lwmline->ngeoms; i++ )
        {
                LWMPOINT *along = lwline_locate_along(lwmline->geoms[i], m, offset);
                if ( along )
                {
                        if ( ! lwgeom_is_empty((LWGEOM*)along) )
                        {
                                for ( j = 0; j < along->ngeoms; j++ )
                                {
                                        lwmpoint_add_lwpoint(lwmpoint, along->geoms[j]);
                                }
                        }
                        /* Free the containing geometry, but leave the sub-geometries around */
                        along->ngeoms = 0;
                        lwmpoint_free(along);
                }
        }
        return lwmpoint;
}

References LWMLINE::geoms, lwgeom_get_srid(), lwgeom_has_m(), lwgeom_has_z(), lwgeom_is_empty(), lwline_locate_along(), lwmline_as_lwgeom(), lwmpoint_add_lwpoint(), lwmpoint_construct_empty(), lwmpoint_free(), and LWMLINE::ngeoms.

Referenced by lwgeom_locate_along().

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