lwpoly_set_effective_area()

static LWPOLY* lwpoly_set_effective_area ( const LWPOLY *  ipoly, int  set_area, double  trshld  )

static

Definition at line 477 of file effectivearea.c.

References LWPOLY::flags, FLAGS_GET_M, FLAGS_GET_Z, LW_FAILURE, LWDEBUG, lwpoly_add_ring(), lwpoly_construct_empty(), lwpoly_is_empty(), POINTARRAY::npoints, LWPOLY::nrings, ptarray_set_effective_area(), LWPOLY::rings, LWPOLY::srid, and LWPOLY::type.

Referenced by lwgeom_set_effective_area().

{
        LWDEBUG(2, "Entered  lwpoly_set_effective_area");
        int i;
        int set_m;
        int avoid_collapse=4;
        if(set_area)
                set_m=1;
        else
                set_m=FLAGS_GET_M(ipoly->flags);
        LWPOLY *opoly = lwpoly_construct_empty(ipoly->srid, FLAGS_GET_Z(ipoly->flags), set_m);

        if( lwpoly_is_empty(ipoly) )
                return opoly; /* should we return NULL instead ? */

        for (i = 0; i < ipoly->nrings; i++)
        {
                POINTARRAY *pa = ptarray_set_effective_area(ipoly->rings[i],avoid_collapse,set_area,trshld);
                /* Add ring to simplified polygon */
                if(pa->npoints>=4)
                {
                        if( lwpoly_add_ring(opoly,pa ) == LW_FAILURE )
                                return NULL;
                }
                /*Inner rings we allow to ocollapse and then we remove them*/
                avoid_collapse=0;
        }


        opoly->type = ipoly->type;

        if( lwpoly_is_empty(opoly) )
                return NULL;

        return opoly;

}

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