mainwindow.cpp Example File
opengl/grabber/mainwindow.cpp
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** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
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** This file is part of the documentation of the Qt Toolkit.
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#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);
}
void MainWindow::renderIntoPixmap()
{
QSize size = getSize();
if (size.isValid()) {
QPixmap pixmap = glWidget->renderPixmap(size.width(), size.height());
setPixmap(pixmap);
}
}
void MainWindow::grabFrameBuffer()
{
QImage image = glWidget->grabFrameBuffer();
setPixmap(QPixmap::fromImage(image));
}
void MainWindow::clearPixmap()
{
setPixmap(QPixmap());
}
void MainWindow::about()
{
QMessageBox::about(this, tr("About Grabber"),
tr("The <b>Grabber</b> example demonstrates two approaches for "
"rendering OpenGL into a Qt pixmap."));
}
void MainWindow::createActions()
{
renderIntoPixmapAct = new QAction(tr("&Render into Pixmap..."), this);
renderIntoPixmapAct->setShortcut(tr("Ctrl+R"));
connect(renderIntoPixmapAct, SIGNAL(triggered()),
this, SLOT(renderIntoPixmap()));
grabFrameBufferAct = new QAction(tr("&Grab Frame Buffer"), this);
grabFrameBufferAct->setShortcut(tr("Ctrl+G"));
connect(grabFrameBufferAct, SIGNAL(triggered()),
this, SLOT(grabFrameBuffer()));
clearPixmapAct = new QAction(tr("&Clear Pixmap"), this);
clearPixmapAct->setShortcut(tr("Ctrl+L"));
connect(clearPixmapAct, SIGNAL(triggered()), this, SLOT(clearPixmap()));
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
aboutAct = new QAction(tr("&About"), this);
connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
aboutQtAct = new QAction(tr("About &Qt"), this);
connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
}
void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(renderIntoPixmapAct);
fileMenu->addAction(grabFrameBufferAct);
fileMenu->addAction(clearPixmapAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
}
QSlider *MainWindow::createSlider(const char *changedSignal,
const char *setterSlot)
{
QSlider *slider = new QSlider(Qt::Horizontal);
slider->setRange(0, 360 * 16);
slider->setSingleStep(16);
slider->setPageStep(15 * 16);
slider->setTickInterval(15 * 16);
slider->setTickPosition(QSlider::TicksRight);
connect(slider, SIGNAL(valueChanged(int)), glWidget, setterSlot);
connect(glWidget, changedSignal, slider, SLOT(setValue(int)));
return slider;
}
void MainWindow::setPixmap(const QPixmap &pixmap)
{
pixmapLabel->setPixmap(pixmap);
QSize size = pixmap.size();
if (size - QSize(1, 0) == pixmapLabelArea->maximumViewportSize())
size -= QSize(1, 0);
pixmapLabel->resize(size);
}
QSize MainWindow::getSize()
{
bool ok;
QString text = QInputDialog::getText(this, tr("Grabber"),
tr("Enter pixmap size:"),
QLineEdit::Normal,
tr("%1 x %2").arg(glWidget->width())
.arg(glWidget->height()),
&ok);
if (!ok)
return QSize();
QRegExp regExp(tr("([0-9]+) *x *([0-9]+)"));
if (regExp.exactMatch(text)) {
int width = regExp.cap(1).toInt();
int height = regExp.cap(2).toInt();
if (width > 0 && width < 2048 && height > 0 && height < 2048)
return QSize(width, height);
}
return glWidget->size();
}
