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The Fast, Light Toolkit (FLTK, pronounced ''fulltick'') is a cross-platform graphical control element (GUI) library developed by Bill Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but it is also suitable for general GUI programming. Using its own widget, drawing and event systems (though FLTK2 has gained experimental support for optionally using the cairo graphics library) abstracted from the underlying system-dependent code, it allows for writing programs which look the same on all supported operating systems. FLTK is free and open-source software, licensed under GNU Lesser General Public License (LGPL) with an additional clause permitting static linking from applications with incompatible licenses. In contrast to user interface libraries like GTK+, Qt, and wxWidgets, FLTK uses a more lightweight design and restricts itself to GUI functionality. Because of this, the library is very small (the FLTK "Hello World" program is around 100 KiB), and is usually statically linked. It also avoids complicated macros and separate code preprocessors, and does not use the following advanced C++ features: templates, exceptions, RTTI or, for FLTK 1.x, namespaces. Combined with the modest size of the package, this leads to a relatively short learning curve for new users.〔http://www.cpplibs.com/libraries/fltk/〕 These advantages come with corresponding disadvantages. FLTK offers fewer widgets than most GUI toolkits and, because of its use of non-native widgets, does not have native look-and-feel on any platform. ==Meaning of the name== FLTK was originally designed to be compatible with the Forms Library written for SGI machines (a derivative of this library called "XForms" is still used quite often). In that library all the functions and structures started with "fl_". This naming was extended to all new methods and widgets in the C++ library, and this prefix "FL" was taken as the name of the library. After FL was released as open source, it was discovered it was impossible to search "FL" on the Internet, because it is also the abbreviation for Florida. After much debating and searching for a new name for the toolkit, which was already in use by several people, Bill Spitzak came up with "FLTK", which stands for the "Fast Light Tool Kit".〔http://www.fltk.org/articles.php?L363+I0+TFAQ+P1+Q〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「FLTK」の詳細全文を読む スポンサード リンク
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