lwcircstring_from_lwmpoint()

LWCIRCSTRING * lwcircstring_from_lwmpoint	(	int	srid,
		LWMPOINT *	mpoint
	)

Definition at line 199 of file lwcircstring.c.

References LWMPOINT::flags, FLAGS_GET_ZM, LWMPOINT::geoms, getPoint_internal(), lwalloc(), lwcircstring_construct(), LWDEBUGF, LWMPOINT::ngeoms, LWPOINT::point, and ptarray_construct_reference_data().

{
        uint32_t i;
        POINTARRAY *pa;
        char zmflag = FLAGS_GET_ZM(mpoint->flags);
        size_t ptsize, size;
        uint8_t *newpoints, *ptr;

        if (zmflag == 0) ptsize = 2 * sizeof(double);
        else if (zmflag == 3) ptsize = 4 * sizeof(double);
        else ptsize = 3 * sizeof(double);

        /* Allocate space for output points */
        size = ptsize * mpoint->ngeoms;
        newpoints = lwalloc(size);
        memset(newpoints, 0, size);

        ptr = newpoints;
        for (i = 0; i < mpoint->ngeoms; i++)
        {
                memcpy(ptr,
                       getPoint_internal(mpoint->geoms[i]->point, 0),
                       ptsize);
                ptr += ptsize;
        }

        pa = ptarray_construct_reference_data(zmflag&2, zmflag&1, mpoint->ngeoms, newpoints);

        LWDEBUGF(3, "lwcurve_from_lwmpoint: constructed pointarray for %d points, %d zmflag", mpoint->ngeoms, zmflag);

        return lwcircstring_construct(srid, NULL, pa);
}

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