自己写的一个画圆程序，由于看不懂网上的那些画圆算法，自己写了一个，用画点的函数画一个圆，很简单，希望对大家有所帮助 -Writing a drawcircle own procedures, because those who can not read online drawcircle algorithm, himself wrote a one-point function with a painting, draw a circle, it is easy, everyone would