lwpoly_chaikin()

static LWPOLY * lwpoly_chaikin ( const LWPOLY *  ipoly, int  n_iterations, int  preserve_endpoint  )

static

Definition at line 126 of file lwchaikins.c.

{
        uint32_t i;
        int j;
        POINTARRAY *pa, *pa_new;
        LWPOLY *opoly = lwpoly_construct_empty(ipoly->srid, FLAGS_GET_Z(ipoly->flags), FLAGS_GET_M(ipoly->flags));
 
        if( lwpoly_is_empty(ipoly) )
                return opoly;
        for (i = 0; i < ipoly->nrings; i++)
        {
                pa = ipoly->rings[i];
                for(j=0;j<n_iterations;j++)
                {
                        pa_new = ptarray_chaikin(pa,preserve_endpoint,LW_TRUE);
                        if(j>0)
                                ptarray_free(pa);
                        pa=pa_new;
                }
                if(pa->npoints>=4)
                {
                        if( lwpoly_add_ring(opoly,pa ) == LW_FAILURE )
                                return NULL;
                }
        }
 
        opoly->type = ipoly->type;
 
        if( lwpoly_is_empty(opoly) )
                return NULL;
 
        return opoly;
 
}

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

Referenced by lwgeom_chaikin().

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