fltk和vega联合编程的例子，fltk是一个跨平台界面包，vega是一个虚拟场景的渲染工具，fltk和vega相结合可实现具有丰富界面的跨平台的vega编程（自己开发）-fltk and Salmon joint programming examples fltk is a cross-platform interface kits, Salmon is a virtual scene rendering tools, and fltk loves to be combined to achieve the rich interface of cross-platform programming Salmon (their development)