/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the documentation of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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#include <cmath>+
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+
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class SimpleTransformation : public QWidget+
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{+
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    void paintEvent(QPaintEvent *);+
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};+
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+
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//! [0]+
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void SimpleTransformation::paintEvent(QPaintEvent *)+
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{+
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    QPainter painter(this);+
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    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));+
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    painter.drawRect(0, 0, 100, 100);+
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+
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    painter.rotate(45);+
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+
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    painter.setFont(QFont("Helvetica", 24));+
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    painter.setPen(QPen(Qt::black, 1));+
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    painter.drawText(20, 10, "QMatrix");+
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}+
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//! [0]+
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+
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class CombinedTransformation : public QWidget+
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{+
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    void paintEvent(QPaintEvent *);+
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};+
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+
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//! [1]+
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void CombinedTransformation::paintEvent(QPaintEvent *)+
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{+
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    QPainter painter(this);+
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    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));+
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    painter.drawRect(0, 0, 100, 100);+
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+
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    QMatrix matrix;+
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    matrix.translate(50, 50);+
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    matrix.rotate(45);+
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    matrix.scale(0.5, 1.0);+
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    painter.setMatrix(matrix);+
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+
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    painter.setFont(QFont("Helvetica", 24));+
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    painter.setPen(QPen(Qt::black, 1));+
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    painter.drawText(20, 10, "QMatrix");+
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}+
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//! [1]+
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+
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class BasicOperations : public QWidget+
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{+
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    void paintEvent(QPaintEvent *);+
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};+
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+
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//! [2]+
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void BasicOperations::paintEvent(QPaintEvent *)+
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{+
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    double pi = 3.14;+
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+
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    double a    = pi/180 * 45.0;+
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    double sina = sin(a);+
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    double cosa = cos(a);+
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+
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    QMatrix translationMatrix(1, 0, 0, 1, 50.0, 50.0);+
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    QMatrix rotationMatrix(cosa, sina, -sina, cosa, 0, 0);+
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    QMatrix scalingMatrix(0.5, 0, 0, 1.0, 0, 0);+
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+
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    QMatrix matrix;+
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    matrix =  scalingMatrix * rotationMatrix * translationMatrix;+
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+
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    QPainter painter(this);+
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    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));+
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    painter.drawRect(0, 0, 100, 100);+
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+
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    painter.setMatrix(matrix);+
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+
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    painter.setFont(QFont("Helvetica", 24));+
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    painter.setPen(QPen(Qt::black, 1));+
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    painter.drawText(20, 10, "QMatrix");+
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}+
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//! [2]+
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+
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int main(int argc, char **argv)+
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{+
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    QApplication app(argc, argv);+
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+
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    QWidget widget;+
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+
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    SimpleTransformation *simpleWidget = new SimpleTransformation;+
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    CombinedTransformation *combinedWidget = new CombinedTransformation;+
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    BasicOperations *basicWidget = new BasicOperations;+
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+
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    QVBoxLayout *layout = new QVBoxLayout;+
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    layout->addWidget(simpleWidget);+
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    layout->addWidget(combinedWidget);+
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    layout->addWidget(basicWidget);+
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    widget.setLayout(layout);+
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+
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    widget.show();+
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    widget.resize(130, 350);+
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    return app.exec();+
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}+
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