<?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 4.2: imagecomposer.cpp Example File (painting/imagecomposition/imagecomposer.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">imagecomposer.cpp Example File<br /><sup><sup>painting/imagecomposition/imagecomposer.cpp</sup></sup></h1> <pre> /**************************************************************************** ** ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 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 GNU ** General Public Licensing requirements will be met: ** http:<span class="comment">//www.trolltech.com/products/qt/opensource.html</span> ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http:<span class="comment">//www.trolltech.com/products/qt/licensing.html or contact the</span> ** sales department at sales@trolltech.com. ** ** 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 "imagecomposer.h" static const QSize resultSize(200, 200); ImageComposer::ImageComposer() { sourceButton = new QToolButton; sourceButton->setIconSize(resultSize); operatorComboBox = new QComboBox; addOp(QPainter::CompositionMode_SourceOver, tr("SourceOver")); addOp(QPainter::CompositionMode_DestinationOver, tr("DestinationOver")); addOp(QPainter::CompositionMode_Clear, tr("Clear")); addOp(QPainter::CompositionMode_Source, tr("Source")); addOp(QPainter::CompositionMode_Destination, tr("Destination")); addOp(QPainter::CompositionMode_SourceIn, tr("SourceIn")); addOp(QPainter::CompositionMode_DestinationIn, tr("DestinationIn")); addOp(QPainter::CompositionMode_SourceOut, tr("SourceOut")); addOp(QPainter::CompositionMode_DestinationOut, tr("DestinationOut")); addOp(QPainter::CompositionMode_SourceAtop, tr("SourceAtop")); addOp(QPainter::CompositionMode_DestinationAtop, tr("DestinationAtop")); addOp(QPainter::CompositionMode_Xor, tr("Xor")); destinationButton = new QToolButton; destinationButton->setIconSize(resultSize); equalLabel = new QLabel(tr("=")); resultLabel = new QLabel; resultLabel->setMinimumWidth(resultSize.width()); connect(sourceButton, SIGNAL(clicked()), this, SLOT(chooseSource())); connect(operatorComboBox, SIGNAL(activated(int)), this, SLOT(recalculateResult())); connect(destinationButton, SIGNAL(clicked()), this, SLOT(chooseDestination())); QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(sourceButton, 0, 0, 3, 1); mainLayout->addWidget(operatorComboBox, 1, 1); mainLayout->addWidget(destinationButton, 0, 2, 3, 1); mainLayout->addWidget(equalLabel, 1, 3); mainLayout->addWidget(resultLabel, 0, 4, 3, 1); mainLayout->setSizeConstraint(QLayout::SetFixedSize); setLayout(mainLayout); resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied); loadImage(":/images/butterfly.png", &sourceImage, sourceButton); loadImage(":/images/checker.png", &destinationImage, destinationButton); setWindowTitle(tr("Image Composition")); } void ImageComposer::chooseSource() { chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton); } void ImageComposer::chooseDestination() { chooseImage(tr("Choose Destination Image"), &destinationImage, destinationButton); } void ImageComposer::recalculateResult() { QPainter::CompositionMode mode = currentMode(); QPainter painter(&resultImage); painter.setCompositionMode(QPainter::CompositionMode_Source); painter.fillRect(resultImage.rect(), Qt::transparent); painter.setCompositionMode(QPainter::CompositionMode_SourceOver); painter.drawImage(0, 0, destinationImage); painter.setCompositionMode(mode); painter.drawImage(0, 0, sourceImage); painter.setCompositionMode(QPainter::CompositionMode_DestinationOver); painter.fillRect(resultImage.rect(), Qt::white); painter.end(); resultLabel->setPixmap(QPixmap::fromImage(resultImage)); } void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name) { operatorComboBox->addItem(name, mode); } void ImageComposer::chooseImage(const QString &title, QImage *image, QToolButton *button) { QString fileName = QFileDialog::getOpenFileName(this, title); if (!fileName.isEmpty()) loadImage(fileName, image, button); } void ImageComposer::loadImage(const QString &fileName, QImage *image, QToolButton *button) { image->load(fileName); QImage fixedImage(resultSize, QImage::Format_ARGB32_Premultiplied); QPainter painter(&fixedImage); painter.setCompositionMode(QPainter::CompositionMode_Source); painter.fillRect(fixedImage.rect(), Qt::transparent); painter.setCompositionMode(QPainter::CompositionMode_SourceOver); painter.drawImage(imagePos(*image), *image); painter.end(); button->setIcon(QPixmap::fromImage(fixedImage)); *image = fixedImage; recalculateResult(); } QPainter::CompositionMode ImageComposer::currentMode() const { return (QPainter::CompositionMode) operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt(); } QPoint ImageComposer::imagePos(const QImage &image) const { return QPoint((resultSize.width() - image.width()) / 2, (resultSize.height() - image.height()) / 2); }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2006 <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 4.2.1</div></td> </tr></table></div></address></body> </html>