UF_EVAL_ask_spline_knots 函数的用法

UF_EVAL_p_t  evaluator;
	UF_EVAL_initialize(obj1, &evaluator);
	double limits[2];
	double mid_t;
	double value;
	UF_EVAL_ask_limits(evaluator, limits);
	UF_CURVE_ask_arc_length(obj1, limits[0], limits[1], UF_MODL_units_t::UF_MODL_UNITS_PART, &value);
	int     n_knots;
	double   *knots;
	UF_EVAL_ask_spline_knots(evaluator, &n_knots, &knots);