此程序不但画出了其中的复杂的螺旋图案，还可以倾斜任意角度，具有较大的灵活性，其中的一些细节很值得学习，对其他的绘制图形起了一个很好的借鉴作用-this program will not only draw one of the complex spiral patterns, can be tilted at any angle, with greater flexibility, some of which is worth learning details of the other mapping graphics with a good reference