<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.3: view.cpp Example File (demos/chip/view.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">view.cpp Example File<br /><sup><sup>demos/chip/view.cpp</sup></sup></h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the demonstration applications of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License versions 2.0 or 3.0 as published by the Free Software ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Alternatively you may (at ** your option) use any later version of the GNU General Public ** License if such license has been publicly approved by Trolltech ASA ** (or its successors, if any) and the KDE Free Qt Foundation. In ** addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.1, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If ** you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech, as the sole ** copyright holder for Qt Designer, grants users of the Qt/Eclipse ** Integration plug-in the right for the Qt/Eclipse Integration to ** link to functionality provided by Qt Designer and its related ** libraries. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly ** granted herein. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/</span> #include "view.h" #include <QtGui> #ifndef QT_NO_OPENGL #include <QtOpenGL> #endif #include <math.h> View::View(const QString &name, QWidget *parent) : QFrame(parent) { setFrameStyle(Sunken | StyledPanel); graphicsView = new QGraphicsView; graphicsView->setRenderHint(QPainter::Antialiasing, false); graphicsView->setDragMode(QGraphicsView::RubberBandDrag); graphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate); int size = style()->pixelMetric(QStyle::PM_ToolBarIconSize); QSize iconSize(size, size); QToolButton *zoomInIcon = new QToolButton; zoomInIcon->setAutoRepeat(true); zoomInIcon->setAutoRepeatInterval(33); zoomInIcon->setAutoRepeatDelay(0); zoomInIcon->setIcon(QPixmap(":/zoomin.png")); zoomInIcon->setIconSize(iconSize); QToolButton *zoomOutIcon = new QToolButton; zoomOutIcon->setAutoRepeat(true); zoomOutIcon->setAutoRepeatInterval(33); zoomOutIcon->setAutoRepeatDelay(0); zoomOutIcon->setIcon(QPixmap(":/zoomout.png")); zoomOutIcon->setIconSize(iconSize); zoomSlider = new QSlider; zoomSlider->setMinimum(0); zoomSlider->setMaximum(500); zoomSlider->setValue(250); zoomSlider->setTickPosition(QSlider::TicksRight); <span class="comment">//</span> Zoom slider layout QVBoxLayout *zoomSliderLayout = new QVBoxLayout; zoomSliderLayout->addWidget(zoomInIcon); zoomSliderLayout->addWidget(zoomSlider); zoomSliderLayout->addWidget(zoomOutIcon); QToolButton *rotateLeftIcon = new QToolButton; rotateLeftIcon->setIcon(QPixmap(":/rotateleft.png")); rotateLeftIcon->setIconSize(iconSize); QToolButton *rotateRightIcon = new QToolButton; rotateRightIcon->setIcon(QPixmap(":/rotateright.png")); rotateRightIcon->setIconSize(iconSize); rotateSlider = new QSlider; rotateSlider->setOrientation(Qt::Horizontal); rotateSlider->setMinimum(-360); rotateSlider->setMaximum(360); rotateSlider->setValue(0); rotateSlider->setTickPosition(QSlider::TicksBelow); <span class="comment">//</span> Rotate slider layout QHBoxLayout *rotateSliderLayout = new QHBoxLayout; rotateSliderLayout->addWidget(rotateLeftIcon); rotateSliderLayout->addWidget(rotateSlider); rotateSliderLayout->addWidget(rotateRightIcon); resetButton = new QToolButton; resetButton->setText(tr("0")); resetButton->setEnabled(false); <span class="comment">//</span> Label layout QHBoxLayout *labelLayout = new QHBoxLayout; label = new QLabel(name); antialiasButton = new QToolButton; antialiasButton->setText(tr("Antialiasing")); antialiasButton->setCheckable(true); antialiasButton->setChecked(false); openGlButton = new QToolButton; openGlButton->setText(tr("OpenGL")); openGlButton->setCheckable(true); #ifndef QT_NO_OPENGL openGlButton->setEnabled(QGLFormat::hasOpenGL()); #else openGlButton->setEnabled(false); #endif printButton = new QToolButton; printButton->setIcon(QIcon(QPixmap(":/fileprint.png"))); labelLayout->addWidget(label); labelLayout->addStretch(); labelLayout->addWidget(antialiasButton); labelLayout->addWidget(openGlButton); labelLayout->addWidget(printButton); QGridLayout *topLayout = new QGridLayout; topLayout->addLayout(labelLayout, 0, 0); topLayout->addWidget(graphicsView, 1, 0); topLayout->addLayout(zoomSliderLayout, 1, 1); topLayout->addLayout(rotateSliderLayout, 2, 0); topLayout->addWidget(resetButton, 2, 1); setLayout(topLayout); connect(resetButton, SIGNAL(clicked()), this, SLOT(resetView())); connect(zoomSlider, SIGNAL(valueChanged(int)), this, SLOT(setupMatrix())); connect(rotateSlider, SIGNAL(valueChanged(int)), this, SLOT(setupMatrix())); connect(graphicsView->verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(setResetButtonEnabled())); connect(graphicsView->horizontalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(setResetButtonEnabled())); connect(antialiasButton, SIGNAL(toggled(bool)), this, SLOT(toggleAntialiasing())); connect(openGlButton, SIGNAL(toggled(bool)), this, SLOT(toggleOpenGL())); connect(rotateLeftIcon, SIGNAL(clicked()), this, SLOT(rotateLeft())); connect(rotateRightIcon, SIGNAL(clicked()), this, SLOT(rotateRight())); connect(zoomInIcon, SIGNAL(clicked()), this, SLOT(zoomIn())); connect(zoomOutIcon, SIGNAL(clicked()), this, SLOT(zoomOut())); connect(printButton, SIGNAL(clicked()), this, SLOT(print())); setupMatrix(); } QGraphicsView *View::view() const { return graphicsView; } void View::resetView() { zoomSlider->setValue(250); rotateSlider->setValue(0); setupMatrix(); graphicsView->ensureVisible(QRectF(0, 0, 0, 0)); resetButton->setEnabled(false); } void View::setResetButtonEnabled() { resetButton->setEnabled(true); } void View::setupMatrix() { qreal scale = ::pow(2.0, (zoomSlider->value() - 250) / 50.0); QMatrix matrix; matrix.scale(scale, scale); matrix.rotate(rotateSlider->value()); graphicsView->setMatrix(matrix); setResetButtonEnabled(); } void View::toggleOpenGL() { #ifndef QT_NO_OPENGL graphicsView->setViewport(openGlButton->isChecked() ? new QGLWidget(QGLFormat(QGL::SampleBuffers)) : new QWidget); #endif } void View::toggleAntialiasing() { graphicsView->setRenderHint(QPainter::Antialiasing, antialiasButton->isChecked()); } void View::print() { QPrinter printer; QPrintDialog dialog(&printer, this); if (dialog.exec() == QDialog::Accepted) { QPainter painter(&printer); graphicsView->render(&painter); } } void View::zoomIn() { zoomSlider->setValue(zoomSlider->value() + 1); } void View::zoomOut() { zoomSlider->setValue(zoomSlider->value() - 1); } void View::rotateLeft() { rotateSlider->setValue(rotateSlider->value() - 10); } void View::rotateRight() { rotateSlider->setValue(rotateSlider->value() + 10); }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2008 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.3.4</div></td> </tr></table></div></address></body> </html>