<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>main.cpp Example File | Qt Widgets 5.9</title>
<link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
<script type="text/javascript">
document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
// loading style sheet breaks anchors that were jumped to before
// so force jumping to anchor again
setTimeout(function() {
var anchor = location.hash;
// need to jump to different anchor first (e.g. none)
location.hash = "#";
setTimeout(function() {
location.hash = anchor;
}, 0);
}, 0);
</script>
</head>
<body>
<div class="header" id="qtdocheader">
<div class="main">
<div class="main-rounded">
<div class="navigationbar">
<table><tr>
<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-graphicsview-boxes-example.html">Boxes</a></td><td >main.cpp Example File</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
</tr></table>
</div>
</div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">main.cpp Example File</h1>
<span class="subtitle">graphicsview/boxes/main.cpp</span>
<!-- $$$graphicsview/boxes/main.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="comment">//#include <GL/glew.h></span>
<span class="preprocessor">#include "glextensions.h"</span>
<span class="preprocessor">#include "scene.h"</span>
<span class="preprocessor">#include <QtWidgets></span>
<span class="preprocessor">#include <QGLWidget></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">"Boxes"</span>));
setRenderHints(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing <span class="operator">|</span> <span class="type"><a href="../qtgui/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="../qtgui/qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event) override {
<span class="keyword">if</span> (scene())
scene()<span class="operator">-</span><span class="operator">></span>setSceneRect(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(<span class="type"><a href="../qtcore/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">></span>size()));
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>resizeEvent(event);
}
};
<span class="keyword">inline</span> bool 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">&</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">' '</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>));
}
bool 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"><</span><span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">></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">"GL_EXT_framebuffer_object"</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">"GL_ARB_vertex_shader"</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">"GL_ARB_fragment_shader"</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">"GL_ARB_shader_objects"</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">&</span><span class="operator">&</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">QGLFormat</span><span class="operator">::</span>openGLVersionFlags() <span class="operator">&</span> <span class="type">QGLFormat</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">"OpenGL features missing"</span><span class="operator">,</span>
<span class="string">"OpenGL version 1.5 or higher is required to run this demo.\n"</span>
<span class="string">"The program will now exit."</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">QGLWidget</span> <span class="operator">*</span>widget <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGLWidget</span>(<span class="type">QGLFormat</span>(QGL<span class="operator">::</span>SampleBuffers));
widget<span class="operator">-</span><span class="operator">></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">"OpenGL features missing"</span><span class="operator">,</span>
<span class="string">"The OpenGL extensions required to run this demo are missing.\n"</span>
<span class="string">"The program will now exit."</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">></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">"OpenGL features missing"</span><span class="operator">,</span>
<span class="string">"Failed to resolve OpenGL functions required to run this demo.\n"</span>
<span class="string">"The program will now exit."</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">"For your information"</span><span class="operator">,</span>
<span class="string">"This demo can be GPU and CPU intensive and may\n"</span>
<span class="string">"work poorly or not at all on your system."</span>);
widget<span class="operator">-</span><span class="operator">></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">&</span>scene);
view<span class="operator">.</span>show();
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
</div>
<!-- @@@graphicsview/boxes/main.cpp -->
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> 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.<br> 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. </p>
</div>
</body>
</html>
distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
3850
