自己派生了一个CStatic类，使得在静态控件中可以绘制多种曲线，并且当鼠标移动到绘图区时，会显示一个透明的提示窗口。在该窗口中显示了具体的曲线参数。-Own a CStatic derived class, makes the static control in a variety of curves can be drawn, and when the mouse moved to the drawing area, it will display a transparent prompt