And when the window is minimized and maximized again, the character is still there since all the codes and data essential to repaint are all gathered in WM_PAINT section.

• 所以下面这一行是：把所有绘画的必需数据放在WM_PAINT中，这样，无论你想在什么时间重绘客户区，你都可以从源代码的任何地方发送WM_PAINT消息来重绘它。