自创的一种新颖的填充算法,利用半开半闭单向指向的矢量线段,避免了奇点处理过程.算法非常巧妙.可以做任意角度填充.真正意义上的数学填充,不是计算机上的象素填充.-Created a novel filled with algorithms, the use of semi-open semi-closed one-way point of the vector line to avoid the singular point process. Algorithm is very clever. C