qt的学习笔记，从简单的hello qt，连接信号，对话框，菜单和工具条。。。到2D和3D图形系统，opengl调用，非常实用-qt learning notes, from a simple hello qt, connecting signal, dialog, menu and toolbar. . . To 2D and 3D graphics system, opengl calls, very useful

OpenGL的开源实现,OpenGL是业界的开放图形库，提供3D图形绘制的API-for OpenGL

读取数据文件，根据数据绘制图形，并实现鼠标捕捉和响应(Read the data file, draw graphics according to the data, and achieve mouse capture and response)