一个分形几何中最常用的递归算法所画的鸡冠花，仅几行代码。可以改变中间的宏定义以实现不同的图形，笔者还画出了树。-a fractal geometry of the most commonly used recursive algorithm painting cockscomb, just a few lines of code. The middle can be changed to achieve Acer different definition graphics, the author