lwcircstring_from_lwpointarray()

LWCIRCSTRING * lwcircstring_from_lwpointarray	(	int32_t	srid,
		uint32_t	npoints,
		const LWPOINT **	points
	)

Definition at line 140 of file lwcircstring.c.

{
        uint32_t i;
        POINTARRAY *pa;
        int has_z = 0, has_m = 0;
        POINT4D pt;
 
        /*
         * Find output dimensions, check integrity
         */
        for (i = 0; i < npoints; i++)
        {
                const LWGEOM *lwg = (LWGEOM*)points[i];
                if (lwg->type != POINTTYPE)
                {
                        lwerror("%s: invalid input type: %s", __func__, lwtype_name(lwg->type));
                        return NULL;
                }
                has_z |= lwgeom_has_z(lwg);
                has_m |= lwgeom_has_m(lwg);
                if (has_z && has_m) break;
        }
 
        /*
         * Allocate output points array
         */
        pa = ptarray_construct(has_z, has_m, npoints);
 
        for (i = 0; i < npoints; i++)
        {
                const LWPOINT *lwpt = points[i];
                if (!getPoint4d_p(lwpt->point, 0, &pt))
                {
                        lwerror("%s: failed getPoint4d_p", __func__);
                        return NULL;
                }
                ptarray_set_point4d(pa, i, &pt);
        }
 
        return lwcircstring_construct(srid, NULL, pa);
}

References getPoint4d_p(), lwcircstring_construct(), lwerror(), lwgeom_has_m(), lwgeom_has_z(), lwtype_name(), LWPOINT::point, POINTTYPE, ptarray_construct(), ptarray_set_point4d(), and LWGEOM::type.

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