Transformed Painter : QPainter « Qt « C++

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C++ » Qt » QPainterScreenshots 
Transformed Painter
  

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtGui>
#include <cmath>

class SimpleTransformation : public QWidget
{
    void paintEvent(QPaintEvent *);
};


void SimpleTransformation::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));
    painter.drawRect(00100100);

    painter.rotate(45);

    painter.setFont(QFont("Helvetica"24));
    painter.setPen(QPen(Qt::black, 1));
    painter.drawText(2010"QTransform");
}


class CombinedTransformation : public QWidget
{
    void paintEvent(QPaintEvent *);
};


void CombinedTransformation::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));
    painter.drawRect(00100100);

    QTransform transform;
    transform.translate(5050);
    transform.rotate(45);
    transform.scale(0.51.0);
    painter.setTransform(transform);

    painter.setFont(QFont("Helvetica"24));
    painter.setPen(QPen(Qt::black, 1));
    painter.drawText(2010"QTransform");
}


class BasicOperations : public QWidget
{
    void paintEvent(QPaintEvent *);
};


void BasicOperations::paintEvent(QPaintEvent *)
{
    double pi = 3.14;

    double a    = pi/180 45.0;
    double sina = sin(a);
    double cosa = cos(a);

    QTransform translationTransform(100150.050.0);
    QTransform rotationTransform(cosa, sina, -sina, cosa, 00);
    QTransform scalingTransform(0.5001.000);

    QTransform transform;
    transform = scalingTransform * rotationTransform * translationTransform;

    QPainter painter(this);
    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));
    painter.drawRect(00100100);

    painter.setTransform(transform);

    painter.setFont(QFont("Helvetica"24));
    painter.setPen(QPen(Qt::black, 1));
    painter.drawText(2010"QTransform");
}


int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QWidget widget;

    SimpleTransformation *simpleWidget = new SimpleTransformation;
    CombinedTransformation *combinedWidget = new CombinedTransformation;
    BasicOperations *basicWidget = new BasicOperations;

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(simpleWidget);
    layout->addWidget(combinedWidget);
    layout->addWidget(basicWidget);
    widget.setLayout(layout);

    widget.show();
    widget.resize(130350);
    return app.exec();
}

   
    
  
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