lwcircstring_from_lwpointarray()

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

Definition at line 141 of file lwcircstring.c.

{
        int zmflag=0;
        uint32_t i;
        POINTARRAY *pa;
        uint8_t *newpoints, *ptr;
        size_t ptsize, size;
 
        /*
         * Find output dimensions, check integrity
         */
        for (i = 0; i < npoints; i++)
        {
                if (points[i]->type != POINTTYPE)
                {
                        lwerror("lwcurve_from_lwpointarray: invalid input type: %s",
                                lwtype_name(points[i]->type));
                        return NULL;
                }
                if (FLAGS_GET_Z(points[i]->flags)) zmflag |= 2;
                if (FLAGS_GET_M(points[i]->flags)) zmflag |= 1;
                if (zmflag == 3) break;
        }
 
        if (zmflag == 0) ptsize = 2 * sizeof(double);
        else if (zmflag == 3) ptsize = 4 * sizeof(double);
        else ptsize = 3 * sizeof(double);
 
        /*
         * Allocate output points array
         */
        size = ptsize * npoints;
        newpoints = lwalloc(size);
        memset(newpoints, 0, size);
 
        ptr = newpoints;
        for (i = 0; i < npoints; i++)
        {
                size = ptarray_point_size(points[i]->point);
                memcpy(ptr, getPoint_internal(points[i]->point, 0), size);
                ptr += ptsize;
        }
        pa = ptarray_construct_reference_data(zmflag&2, zmflag&1, npoints, newpoints);
 
        return lwcircstring_construct(srid, NULL, pa);
}

References FLAGS_GET_M, FLAGS_GET_Z, getPoint_internal(), lwalloc(), lwcircstring_construct(), lwerror(), lwtype_name(), POINTTYPE, ptarray_construct_reference_data(), and ptarray_point_size().

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