/**

 \page preface Preface

This manual describes the Fast Light Tool Kit ("FLTK")
version 1.4.0, a C++ Graphical User Interface
("GUI") toolkit for UNIX, Microsoft Windows and Apple OS X.

Version 1.4.0 introduces support for a new windowing system
under LINUX: Wayland. Thus, FLTK applications under LINUX can
now be built to use either X11 or Wayland as windowing system.

Each of the chapters in this manual is designed as a tutorial for
using FLTK, while the appendices provide a convenient reference
for all FLTK widgets, functions, and operating system
interfaces.

<B>This manual may be printed, modified, and/or used under
the terms of the FLTK license provided in \ref license.</B>

\section preface_organisation Organization

This manual is organized into the following chapters and appendices:

\li \ref intro
\li \ref basics
\li \ref common
\li \ref editor
\li \ref drawing
\li \ref events
\li \ref subclassing
\li \ref opengl
\li \ref fluid
\li \ref advanced
\li \ref unicode
\li \ref enumerations
\li \ref glut
\li \ref forms
\li \ref osissues
\li \ref migration_1_4
\li \ref development
\li \ref license
\li \ref examples

\section preface_conventions Conventions

This manual was generated using Doxygen
(see http://www.doxygen.org/)
to process the source code itself, special comments in the code,
and additional documentation files.
In general, Doxygen recognizes and denotes the following entities as shown:
- classes, such as Fl_Widget,
- methods, such as Fl_Widget::callback(Fl_Callback* cb, void* p),
- functions, such as fl_draw(const char *str, int x, int y),
- internal links, such as \ref preface_conventions,
- external links, such as http://www.stack.nl/~dimitri/doxygen/

Other code samples and commands are shown in <tt>regular courier type</tt>.

\section preface_abbreviations Abbreviations

The following abbreviations are used in this manual:

\par  X11
The X Window System version 11.

\par Xlib
The X Window System interface library.

\par MS Windows, <tt>WIN32</tt>
The Microsoft Windows Application Programmer's Interface for Windows 2000,
Windows XP, Windows Vista, Windows 7 and later Windows versions.
FLTK uses the preprocessor definition <tt>_WIN32</tt> for the 32 bit
and 64 bit MS Windows API.

\par OS X, <tt>__APPLE__</tt>
The Apple desktop operating sytem OS X 10.0 and later. MacOS 8 and 9 support
was dropped after FLTK 1.0.10. FLTK uses the preprocessor definition
<tt>__APPLE__</tt> for OS X.

\section preface_copyrights Copyrights and Trademarks

FLTK is Copyright 1998-2020 by Bill Spitzak and others.  Use and
distribution of FLTK is governed by the GNU Library General Public
License with 4 exceptions, located in \ref license.

UNIX is a registered trademark of the X Open Group, Inc.
Microsoft and Windows are registered trademarks of Microsoft
Corporation. OpenGL is a registered trademark of Silicon
Graphics, Inc. Apple, Macintosh, MacOS, and Mac OS X are
registered trademarks of Apple Computer, Inc.


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