说明：  平时, 用惯了API、CDC和封装好的内部函数,关于画线,画圆这些东西都是信手拈来... 最近学习计算机图形学,不得不深入内部研究一下底层算法... 在这里贴几个代码分享一下! (这里只给出MFC的OnDraw函数)
(In peacetime, used to use the API, CDC, and packaged inside a function, with regard to drawing lines, draw a circle are all these things come in handy ... a recent study computer graphics, but in-depth look at the bottom of the internal algorithms posted here a few ... a code share with you! (here only give MFC the OnDraw function))