lwline_from_ptarray()

LWLINE * lwline_from_ptarray	(	int32_t	srid,
		uint32_t	npoints,
		LWPOINT **	points
	)

Definition at line 238 of file lwline.c.

{
        uint32_t i;
        int hasz = LW_FALSE;
        int hasm = LW_FALSE;
        POINTARRAY *pa;
        LWLINE *line;
        POINT4D pt;
 
        /*
         * Find output dimensions, check integrity
         */
        for (i=0; i<npoints; i++)
        {
                if ( points[i]->type != POINTTYPE )
                {
                        lwerror("lwline_from_ptarray: invalid input type: %s", lwtype_name(points[i]->type));
                        return NULL;
                }
                if ( FLAGS_GET_Z(points[i]->flags) ) hasz = LW_TRUE;
                if ( FLAGS_GET_M(points[i]->flags) ) hasm = LW_TRUE;
                if ( hasz && hasm ) break; /* Nothing more to learn! */
        }
 
        pa = ptarray_construct_empty(hasz, hasm, npoints);
 
        for ( i=0; i < npoints; i++ )
        {
                if ( ! lwpoint_is_empty(points[i]) )
                {
                        lwpoint_getPoint4d_p(points[i], &pt);
                        ptarray_append_point(pa, &pt, LW_TRUE);
                }
        }
 
        if ( pa->npoints > 0 )
                line = lwline_construct(srid, NULL, pa);
        else
                line = lwline_construct_empty(srid, hasz, hasm);
 
        return line;
}

References FLAGS_GET_M, FLAGS_GET_Z, LW_FALSE, LW_TRUE, lwerror(), lwline_construct(), lwline_construct_empty(), lwpoint_getPoint4d_p(), lwpoint_is_empty(), lwtype_name(), POINTARRAY::npoints, POINTTYPE, ptarray_append_point(), and ptarray_construct_empty().

Referenced by create_v_line(), lw_dist2d_distanceline(), and lw_dist3d_distanceline().

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