lwmpoint_clip_to_ordinate_range()

static LWCOLLECTION* lwmpoint_clip_to_ordinate_range ( const LWMPOINT *  mpoint, char  ordinate, double  from, double  to  )

inlinestatic

Clip an input MULTIPOINT between two values, on any ordinate input.

Definition at line 392 of file lwlinearreferencing.c.

{
        LWCOLLECTION *lwgeom_out = NULL;
        char hasz, hasm;
        uint32_t i;
 
        /* Read Z/M info */
        hasz = lwgeom_has_z(lwmpoint_as_lwgeom(mpoint));
        hasm = lwgeom_has_m(lwmpoint_as_lwgeom(mpoint));
 
        /* Prepare return object */
        lwgeom_out = lwcollection_construct_empty(MULTIPOINTTYPE, mpoint->srid, hasz, hasm);
 
        /* For each point, is its ordinate value between from and to? */
        for (i = 0; i < mpoint->ngeoms; i++)
        {
                POINT4D p4d;
                double ordinate_value;
 
                lwpoint_getPoint4d_p(mpoint->geoms[i], &p4d);
                ordinate_value = lwpoint_get_ordinate(&p4d, ordinate);
 
                if (from <= ordinate_value && to >= ordinate_value)
                {
                        LWPOINT *lwp = lwpoint_clone(mpoint->geoms[i]);
                        lwcollection_add_lwgeom(lwgeom_out, lwpoint_as_lwgeom(lwp));
                }
        }
 
        /* Set the bbox, if necessary */
        if (mpoint->bbox)
                lwgeom_refresh_bbox((LWGEOM *)lwgeom_out);
 
        return lwgeom_out;
}

References LWMPOINT::bbox, LWMPOINT::geoms, lwcollection_add_lwgeom(), lwcollection_construct_empty(), lwgeom_has_m(), lwgeom_has_z(), lwgeom_refresh_bbox(), lwmpoint_as_lwgeom(), lwpoint_as_lwgeom(), lwpoint_clone(), lwpoint_get_ordinate(), lwpoint_getPoint4d_p(), MULTIPOINTTYPE, LWMPOINT::ngeoms, and LWMPOINT::srid.

Referenced by lwgeom_clip_to_ordinate_range().

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