单文档无闪烁绘图，对于初学绘图的朋友很有帮助-Single Document no flicker drawing, drawing for the beginner' s friends helpful

纯Win32SDK编写，采用二次缓冲技术防止屏幕闪烁，字体旋转技术显示钟表刻度，是参考学习之佳作。-Pure Win32SDK writing, using secondary buffer technology to prevent screen flicker, font rotation technique to display a clock tick, is a reference to learning works.