实现2D画图，用QT，可以跨平台的显示界面-Achieve 2D drawing, using QT, you can cross-platform display interface

该文档是SDL图型库，可以运用库中函数方便的编写图形界面，适合做跨平台的界面开发-This document is SDL graphics library, the library functions can be applied to facilitate the preparation of the graphical interface, suitable for cross-platform interface development