用VC++写的三次B样条曲线算法，能够实现与控制多边形的外形更接近，局部修改能力 任意形状，包括尖点、直线的曲线，易于拼接，阶次低，与型值点数目无关，计算简便-Using VC++ to write the three B-spline curve algorithm, can be achieved with the control polygon is closer to the shape, the capacity of local modification of arbitrary