制订一种重新绘制图形的刷新方式，将图形绘制模块放在消息WM_PAINT的处理过程中，当窗口需要刷新时，通知窗口函数重新绘制图形以完成刷新工作。本程序要求先使用画笔和画刷绘制一个矩形，然后使用红色网格绘制一个椭圆，再使用绿色点划线绘制椭圆的轴线。-Develop a way to redraw the graphics refresh the graphics rendering module in the process of message WM_PAINT, when the window needs to be refreshed, the notification window function to redraw the graph to complete the refresh operation. This procedure requires the use of pen and brush to draw a rectangle, and then draw an ellipse with a red grid, then use the green dotted line to draw the axis of the ellipse.