lili/qt4-x11
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
master
qt4-x11/doc/html/demos-boxes-main-cpp.html
lili 35a2a1d584 init
2025-08-24 20:55:26 +08:00

352 lines
22 KiB
HTML
Raw Permalink Blame History

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Qt 4.8: main.cpp Example File (demos/boxes/main.cpp)</title>
<link rel="stylesheet" type="text/css" href="style/style.css" />
<script src="scripts/jquery.js" type="text/javascript"></script>
<script src="scripts/functions.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="style/superfish.css" />
<link rel="stylesheet" type="text/css" href="style/narrow.css" />
<!--[if IE]>
<meta name="MSSmartTagsPreventParsing" content="true">
<meta http-equiv="imagetoolbar" content="no">
<![endif]-->
<!--[if lt IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie6.css">
<![endif]-->
<!--[if IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie7.css">
<![endif]-->
<!--[if IE 8]>
<link rel="stylesheet" type="text/css" href="style/style_ie8.css">
<![endif]-->
<script src="scripts/superfish.js" type="text/javascript"></script>
<script src="scripts/narrow.js" type="text/javascript"></script>
</head>
<body class="" onload="CheckEmptyAndLoadList();">
<div class="header" id="qtdocheader">
<div class="content">
<div id="nav-logo">
<a href="index.html">Home</a></div>
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
<div id="narrowsearch"></div>
<div id="nav-topright">
<ul>
<li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li>
<li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li>
<li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/">
DOC</a></li>
<li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li>
</ul>
</div>
<div id="shortCut">
<ul>
<li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li>
<li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li>
</ul>
</div>
<ul class="sf-menu" id="narrowmenu">
<li><a href="#">API Lookup</a>
<ul>
<li><a href="classes.html">Class index</a></li>
<li><a href="functions.html">Function index</a></li>
<li><a href="modules.html">Modules</a></li>
<li><a href="namespaces.html">Namespaces</a></li>
<li><a href="qtglobal.html">Global Declarations</a></li>
<li><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</li>
<li><a href="#">Qt Topics</a>
<ul>
<li><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li><a href="qtquick.html">Device UIs &amp; Qt Quick</a></li>
<li><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li><a href="supported-platforms.html">Supported Platforms</a></li>
<li><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</li>
<li><a href="#">Examples</a>
<ul>
<li><a href="all-examples.html">Examples</a></li>
<li><a href="tutorials.html">Tutorials</a></li>
<li><a href="demos.html">Demos</a></li>
<li><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="wrapper">
<div class="hd">
<span></span>
</div>
<div class="bd group">
<div class="sidebar">
<div class="searchlabel">
Search index:</div>
<div class="search" id="sidebarsearch">
<form id="qtdocsearch" action="" onsubmit="return false;">
<fieldset>
<input type="text" name="searchstring" id="pageType" value="" />
<div id="resultdialog">
<a href="#" id="resultclose">Close</a>
<p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p>
<p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span>&nbsp;results:</p>
<ul id="resultlist" class="all">
</ul>
</div>
</fieldset>
</form>
</div>
<div class="box first bottombar" id="lookup">
<h2 title="API Lookup"><span></span>
API Lookup</h2>
<div id="list001" class="list">
<ul id="ul001" >
<li class="defaultLink"><a href="classes.html">Class index</a></li>
<li class="defaultLink"><a href="functions.html">Function index</a></li>
<li class="defaultLink"><a href="modules.html">Modules</a></li>
<li class="defaultLink"><a href="namespaces.html">Namespaces</a></li>
<li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li>
<li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</div>
</div>
<div class="box bottombar" id="topics">
<h2 title="Qt Topics"><span></span>
Qt Topics</h2>
<div id="list002" class="list">
<ul id="ul002" >
<li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li class="defaultLink"><a href="qtquick.html">Device UIs &amp; Qt Quick</a></li>
<li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li>
<li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</div>
</div>
<div class="box" id="examples">
<h2 title="Examples"><span></span>
Examples</h2>
<div id="list003" class="list">
<ul id="ul003">
<li class="defaultLink"><a href="all-examples.html">Examples</a></li>
<li class="defaultLink"><a href="tutorials.html">Tutorials</a></li>
<li class="defaultLink"><a href="demos.html">Demos</a></li>
<li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</div>
</div>
</div>
<div class="wrap">
<div class="toolbar">
<div class="breadcrumb toolblock">
<ul>
<li class="first"><a href="index.html">Home</a></li>
<!-- Breadcrumbs go here -->
</ul>
</div>
<div class="toolbuttons toolblock">
<ul>
<li id="smallA" class="t_button">A</li>
<li id="medA" class="t_button active">A</li>
<li id="bigA" class="t_button">A</li>
<li id="print" class="t_button"><a href="javascript:this.print();">
<span>Print</span></a></li>
</ul>
</div>
</div>
<div class="content mainContent">
<h1 class="title">main.cpp Example File</h1>
<span class="small-subtitle">demos/boxes/main.cpp</span>
<!-- $$$demos/boxes/main.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="comment">//#include &lt;GL/glew.h&gt;</span>
<span class="preprocessor">#include &quot;glextensions.h&quot;</span>
<span class="preprocessor">#include &quot;scene.h&quot;</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &lt;QGLWidget&gt;</span>
<span class="keyword">class</span> GraphicsView : <span class="keyword">public</span> <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span>
{
<span class="keyword">public</span>:
GraphicsView()
{
setWindowTitle(tr(<span class="string">&quot;Boxes&quot;</span>));
setRenderHints(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing <span class="operator">|</span> <span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>SmoothPixmapTransform);
<span class="comment">//setRenderHints(QPainter::SmoothPixmapTransform);</span>
}
<span class="keyword">protected</span>:
<span class="type">void</span> resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event) {
<span class="keyword">if</span> (scene())
scene()<span class="operator">-</span><span class="operator">&gt;</span>setSceneRect(<span class="type"><a href="qrect.html">QRect</a></span>(<span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> event<span class="operator">-</span><span class="operator">&gt;</span>size()));
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>resizeEvent(event);
}
};
<span class="keyword">inline</span> <span class="type">bool</span> matchString(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>extensionString<span class="operator">,</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>subString)
{
<span class="type">int</span> subStringLength <span class="operator">=</span> strlen(subString);
<span class="keyword">return</span> (strncmp(extensionString<span class="operator">,</span> subString<span class="operator">,</span> subStringLength) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
<span class="operator">&amp;</span><span class="operator">&amp;</span> ((extensionString<span class="operator">[</span>subStringLength<span class="operator">]</span> <span class="operator">=</span><span class="operator">=</span> <span class="char">' '</span>) <span class="operator">|</span><span class="operator">|</span> (extensionString<span class="operator">[</span>subStringLength<span class="operator">]</span> <span class="operator">=</span><span class="operator">=</span> <span class="char">'\0'</span>));
}
<span class="type">bool</span> necessaryExtensionsSupported()
{
<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>extensionString <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">&gt;</span>(glGetString(GL_EXTENSIONS));
<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>p <span class="operator">=</span> extensionString;
<span class="keyword">const</span> <span class="type">int</span> GL_EXT_FBO <span class="operator">=</span> <span class="number">1</span>;
<span class="keyword">const</span> <span class="type">int</span> GL_ARB_VS <span class="operator">=</span> <span class="number">2</span>;
<span class="keyword">const</span> <span class="type">int</span> GL_ARB_FS <span class="operator">=</span> <span class="number">4</span>;
<span class="keyword">const</span> <span class="type">int</span> GL_ARB_SO <span class="operator">=</span> <span class="number">8</span>;
<span class="type">int</span> extensions <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (<span class="operator">*</span>p) {
<span class="keyword">if</span> (matchString(p<span class="operator">,</span> <span class="string">&quot;GL_EXT_framebuffer_object&quot;</span>))
extensions <span class="operator">|</span><span class="operator">=</span> GL_EXT_FBO;
<span class="keyword">else</span> <span class="keyword">if</span> (matchString(p<span class="operator">,</span> <span class="string">&quot;GL_ARB_vertex_shader&quot;</span>))
extensions <span class="operator">|</span><span class="operator">=</span> GL_ARB_VS;
<span class="keyword">else</span> <span class="keyword">if</span> (matchString(p<span class="operator">,</span> <span class="string">&quot;GL_ARB_fragment_shader&quot;</span>))
extensions <span class="operator">|</span><span class="operator">=</span> GL_ARB_FS;
<span class="keyword">else</span> <span class="keyword">if</span> (matchString(p<span class="operator">,</span> <span class="string">&quot;GL_ARB_shader_objects&quot;</span>))
extensions <span class="operator">|</span><span class="operator">=</span> GL_ARB_SO;
<span class="keyword">while</span> ((<span class="operator">*</span>p <span class="operator">!</span><span class="operator">=</span> <span class="char">' '</span>) <span class="operator">&amp;</span><span class="operator">&amp;</span> (<span class="operator">*</span>p <span class="operator">!</span><span class="operator">=</span> <span class="char">'\0'</span>))
<span class="operator">+</span><span class="operator">+</span>p;
<span class="keyword">if</span> (<span class="operator">*</span>p <span class="operator">=</span><span class="operator">=</span> <span class="char">' '</span>)
<span class="operator">+</span><span class="operator">+</span>p;
}
<span class="keyword">return</span> (extensions <span class="operator">=</span><span class="operator">=</span> <span class="number">15</span>);
}
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv)
{
<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
<span class="keyword">if</span> ((<span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>openGLVersionFlags() <span class="operator">&amp;</span> <span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>OpenGL_Version_1_5) <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(<span class="number">0</span><span class="operator">,</span> <span class="string">&quot;OpenGL features missing&quot;</span><span class="operator">,</span>
<span class="string">&quot;OpenGL version 1.5 or higher is required to run this demo.\n&quot;</span>
<span class="string">&quot;The program will now exit.&quot;</span>);
<span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>;
}
<span class="type">int</span> maxTextureSize <span class="operator">=</span> <span class="number">1024</span>;
<span class="type"><a href="qglwidget.html">QGLWidget</a></span> <span class="operator">*</span>widget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers));
widget<span class="operator">-</span><span class="operator">&gt;</span>makeCurrent();
<span class="keyword">if</span> (<span class="operator">!</span>necessaryExtensionsSupported()) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(<span class="number">0</span><span class="operator">,</span> <span class="string">&quot;OpenGL features missing&quot;</span><span class="operator">,</span>
<span class="string">&quot;The OpenGL extensions required to run this demo are missing.\n&quot;</span>
<span class="string">&quot;The program will now exit.&quot;</span>);
<span class="keyword">delete</span> widget;
<span class="keyword">return</span> <span class="operator">-</span><span class="number">2</span>;
}
<span class="comment">// Check if all the necessary functions are resolved.</span>
<span class="keyword">if</span> (<span class="operator">!</span>getGLExtensionFunctions()<span class="operator">.</span>resolve(widget<span class="operator">-</span><span class="operator">&gt;</span>context())) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(<span class="number">0</span><span class="operator">,</span> <span class="string">&quot;OpenGL features missing&quot;</span><span class="operator">,</span>
<span class="string">&quot;Failed to resolve OpenGL functions required to run this demo.\n&quot;</span>
<span class="string">&quot;The program will now exit.&quot;</span>);
<span class="keyword">delete</span> widget;
<span class="keyword">return</span> <span class="operator">-</span><span class="number">3</span>;
}
<span class="comment">// TODO: Make conditional for final release</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="number">0</span><span class="operator">,</span> <span class="string">&quot;For your information&quot;</span><span class="operator">,</span>
<span class="string">&quot;This demo can be GPU and CPU intensive and may\n&quot;</span>
<span class="string">&quot;work poorly or not at all on your system.&quot;</span>);
widget<span class="operator">-</span><span class="operator">&gt;</span>makeCurrent(); <span class="comment">// The current context must be set before calling Scene's constructor</span>
Scene scene(<span class="number">1024</span><span class="operator">,</span> <span class="number">768</span><span class="operator">,</span> maxTextureSize);
GraphicsView view;
view<span class="operator">.</span>setViewport(widget);
view<span class="operator">.</span>setViewportUpdateMode(<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>FullViewportUpdate);
view<span class="operator">.</span>setScene(<span class="operator">&amp;</span>scene);
view<span class="operator">.</span>show();
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}</pre>
</div>
<!-- @@@demos/boxes/main.cpp -->
</div>
</div>
</div>
<div class="ft">
<span></span>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">&copy;</acronym> 2015 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.</p>
<br />
<p>
The documentation provided herein is licensed under the terms of the
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
License version 1.3</a> as published by the Free Software Foundation.</p>
<p>
Documentation sources may be obtained from <a href="http://www.qt-project.org">
www.qt-project.org</a>.</p>
<br />
<p>
Qt and respective logos are trademarks of The Qt Company Ltd
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. <a title="Privacy Policy"
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
</div>
<script src="scripts/functions.js" type="text/javascript"></script>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink