gui绘制曲线，坐标系变换，运行在linux系统下，使用qt软件开发,gui drawing curves, coordinate transformations, running on linux system, the use of software development qt

linux环境下利用QT4做的一个小程序，程序中窗口部件使用了双缓冲技术-linux environment using QT4 do a small procedure, process window using a double buffering components technology