x11 windows 入门Demo3

// Written by Ch. Tronche (http://tronche.com/)
// Copyright by the author. This is unmaintained, no-warranty free software. 
// Please use freely. It is appreciated (but by no means mandatory) to
// acknowledge the author's contribution. Thank you.
//
//  Copyright (C) 1998-2000 by Christophe Tronche ("the author"). All
//  Rights Reserved.

//  Permission is hereby granted, free of charge, to any person obtaining
//  a copy of this software and associated documentation files (the
//  "Software"), to deal in the Software without restriction, including
//  without limitation the rights to use, copy, modify, merge, publish,
//  distribute, sublicense, and/or sell copies of the Software, and to
//  permit persons to whom the Software is furnished to do so, subject to
//  the following conditions:

//  The above copyright notice and this permission notice shall be
//  included in all copies or substantial portions of the Software.

//  THE SOFTWARE IS PROVID