实现功能：按下鼠标左键+CTL键或点击菜单时，在窗口画一个风车，风车中有3个叶片，外侧有一个外接圆。风车随着时间旋转，并且从屏幕的左端向右端滚动。

按下鼠标左键+SHIFT键或点击菜单时，在客户区的下面显示一行唐诗”孤帆远影碧空尽，唯见长江天际流“，向右滚动显示，每显示一轮改变一次颜色和字体，一共4轮重复变化。

-Functions: press the left mouse button+CTL key or click the menu in the window to draw a windmill, windmills have three blades, the outside of a circumcircle. The windmills rotation over time, and from the left to the right side of the screen to scroll. Press the left mouse button+SHIFT key or click the menu displayed in the client area below a line Tang Gu Fan Yuan shadow blue sky to make, only see the the Yangtze sky stream " , scroll right to display, each display a change colors and fonts , a total of four repeated changes.