shift-sin-wav

  移动的正弦线。这一个参考了网上生成正弦线程序，新建了一个CStatic派生类，外加定时器做的使，用了双缓冲技术。涉及PostMessage函数的使用。(Moving sine line. This is a reference to generate sinusoidal line online program, created a new CStatic derived class, plus a timer to do so, with a double-buffering. Involving the use of PostMessage function.)