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#include <QtGui>

#include <cmath>

class SimpleTransformation : public QWidget

{

    void paintEvent(QPaintEvent *);

};

//! [0]

void SimpleTransformation::paintEvent(QPaintEvent *)

{

    QPainter painter(this);

    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));

    painter.drawRect(0, 0, 100, 100);

    painter.rotate(45);

    painter.setFont(QFont("Helvetica", 24));

    painter.setPen(QPen(Qt::black, 1));

    painter.drawText(20, 10, "QMatrix");

}

//! [0]

class CombinedTransformation : public QWidget

{

    void paintEvent(QPaintEvent *);

};

//! [1]

void CombinedTransformation::paintEvent(QPaintEvent *)

{

    QPainter painter(this);

    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));

    painter.drawRect(0, 0, 100, 100);

    QMatrix matrix;

    matrix.translate(50, 50);

    matrix.rotate(45);

    matrix.scale(0.5, 1.0);

    painter.setMatrix(matrix);

    painter.setFont(QFont("Helvetica", 24));

    painter.setPen(QPen(Qt::black, 1));

    painter.drawText(20, 10, "QMatrix");

}

//! [1]

class BasicOperations : public QWidget

{

    void paintEvent(QPaintEvent *);

};

//! [2]

void BasicOperations::paintEvent(QPaintEvent *)

{

    double pi = 3.14;

    double a    = pi/180 * 45.0;

    double sina = sin(a);

    double cosa = cos(a);

    QMatrix translationMatrix(1, 0, 0, 1, 50.0, 50.0);

    QMatrix rotationMatrix(cosa, sina, -sina, cosa, 0, 0);

    QMatrix scalingMatrix(0.5, 0, 0, 1.0, 0, 0);

    QMatrix matrix;

    matrix =  scalingMatrix * rotationMatrix * translationMatrix;

    QPainter painter(this);

    painter.setPen(QPen(Qt::blue, 1, Qt::DashLine));

    painter.drawRect(0, 0, 100, 100);

    painter.setMatrix(matrix);

    painter.setFont(QFont("Helvetica", 24));

    painter.setPen(QPen(Qt::black, 1));

    painter.drawText(20, 10, "QMatrix");

}

//! [2]

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(130, 350);

    return app.exec();

}