这是BSPLINE测试程序，鼠标单击4个点后生成3次b样条，使用qt4.8.5 + vs2008编译 内含可执行文件，支持定点拖拽-This is BSPLINE test program that generates click four points after three b-spline, use qt4.8.5+ vs2008 compiled containing the executable file, and support drag control point