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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">mainwindow.cpp Example File<br /><small><small>opengl/grabber/mainwindow.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

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** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

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** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

#include <QtGui>

#include <QtOpenGL>

#include "glwidget.h"

#include "mainwindow.h"

MainWindow::MainWindow()

{

centralWidget = new QWidget;

setCentralWidget(centralWidget);

glWidget = new GLWidget;

pixmapLabel = new QLabel;

glWidgetArea = new QScrollArea;

glWidgetArea->setWidget(glWidget);

glWidgetArea->setWidgetResizable(true);

glWidgetArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

glWidgetArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

glWidgetArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

glWidgetArea->setMinimumSize(50, 50);

pixmapLabelArea = new QScrollArea;

pixmapLabelArea->setWidget(pixmapLabel);

pixmapLabelArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

pixmapLabelArea->setMinimumSize(50, 50);

xSlider = createSlider(SIGNAL(xRotationChanged(int)),

SLOT(setXRotation(int)));

ySlider = createSlider(SIGNAL(yRotationChanged(int)),

SLOT(setYRotation(int)));

zSlider = createSlider(SIGNAL(zRotationChanged(int)),

SLOT(setZRotation(int)));

createActions();

createMenus();

QGridLayout *centralLayout = new QGridLayout;

centralLayout->addWidget(glWidgetArea, 0, 0);

centralLayout->addWidget(pixmapLabelArea, 0, 1);

centralLayout->addWidget(xSlider, 1, 0, 1, 2);

centralLayout->addWidget(ySlider, 2, 0, 1, 2);

centralLayout->addWidget(zSlider, 3, 0, 1, 2);

centralWidget->setLayout(centralLayout);

xSlider->setValue(15 * 16);

ySlider->setValue(345 * 16);

zSlider->setValue(0 * 16);

setWindowTitle(tr("Grabber"));

resize(400, 300);

}

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void MainWindow::renderIntoPixmap()

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{

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QSize size = getSize();

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if (size.isValid()) {

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QPixmap pixmap = glWidget->renderPixmap(size.width(), size.height());

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setPixmap(pixmap);

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}

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}

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void MainWindow::grabFrameBuffer()

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{

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QImage image = glWidget->grabFrameBuffer();

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setPixmap(QPixmap::fromImage(image));

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}

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void MainWindow::clearPixmap()

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{

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setPixmap(QPixmap());

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}

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void MainWindow::about()

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{

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QMessageBox::about(this, tr("About Grabber"),

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tr("The <b>Grabber</b> example demonstrates two approaches for "

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"rendering OpenGL into a Qt pixmap."));

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}

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void MainWindow::createActions()

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{

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renderIntoPixmapAct = new QAction(tr("&Render into Pixmap..."), this);

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renderIntoPixmapAct->setShortcut(tr("Ctrl+R"));

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connect(renderIntoPixmapAct, SIGNAL(triggered()),

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this, SLOT(renderIntoPixmap()));

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grabFrameBufferAct = new QAction(tr("&Grab Frame Buffer"), this);

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grabFrameBufferAct->setShortcut(tr("Ctrl+G"));

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connect(grabFrameBufferAct, SIGNAL(triggered()),

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this, SLOT(grabFrameBuffer()));

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clearPixmapAct = new QAction(tr("&Clear Pixmap"), this);

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clearPixmapAct->setShortcut(tr("Ctrl+L"));

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connect(clearPixmapAct, SIGNAL(triggered()), this, SLOT(clearPixmap()));

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exitAct = new QAction(tr("E&xit"), this);

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exitAct->setShortcut(tr("Ctrl+Q"));

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connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

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aboutAct = new QAction(tr("&About"), this);

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connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

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aboutQtAct = new QAction(tr("About &Qt"), this);

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connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

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}

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void MainWindow::createMenus()

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{

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fileMenu = menuBar()->addMenu(tr("&File"));

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fileMenu->addAction(renderIntoPixmapAct);

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fileMenu->addAction(grabFrameBufferAct);

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fileMenu->addAction(clearPixmapAct);

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fileMenu->addSeparator();

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fileMenu->addAction(exitAct);

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helpMenu = menuBar()->addMenu(tr("&Help"));

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helpMenu->addAction(aboutAct);

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helpMenu->addAction(aboutQtAct);

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}

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QSlider *MainWindow::createSlider(const char *changedSignal,

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const char *setterSlot)

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{

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QSlider *slider = new QSlider(Qt::Horizontal);

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slider->setRange(0, 360 * 16);

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slider->setSingleStep(16);

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slider->setPageStep(15 * 16);

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slider->setTickInterval(15 * 16);

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slider->setTickPosition(QSlider::TicksRight);

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connect(slider, SIGNAL(valueChanged(int)), glWidget, setterSlot);

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connect(glWidget, changedSignal, slider, SLOT(setValue(int)));

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return slider;

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}

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void MainWindow::setPixmap(const QPixmap &pixmap)

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{

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pixmapLabel->setPixmap(pixmap);

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QSize size = pixmap.size();

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if (size - QSize(1, 0) == pixmapLabelArea->maximumViewportSize())

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size -= QSize(1, 0);

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pixmapLabel->resize(size);

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}

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QSize MainWindow::getSize()

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{

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bool ok;

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QString text = QInputDialog::getText(this, tr("Grabber"),

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tr("Enter pixmap size:"),

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QLineEdit::Normal,

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tr("%1 x %2").arg(glWidget->width())

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.arg(glWidget->height()),

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&ok);

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if (!ok)

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return QSize();

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QRegExp regExp(tr("([0-9]+) *x *([0-9]+)"));

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if (regExp.exactMatch(text)) {

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int width = regExp.cap(0).toInt();

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int height = regExp.cap(1).toInt();

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if (width > 0 && width < 2048 && height > 0 && height < 2048)

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return QSize(width, height);

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}

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return glWidget->size();

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}</pre>

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