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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the documentation of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

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    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 #include <cmath>

    44 

    45 class SimpleTransformation : public QWidget

    46 {

    47     void paintEvent(QPaintEvent *);

    48 };

    49 

    50 //! [0]

    51 void SimpleTransformation::paintEvent(QPaintEvent *)

    52 {

    53     QPainter painter(this);

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

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

    56 

    57     painter.rotate(45);

    58 

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

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

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

    62 }

    63 //! [0]

    64 

    65 class CombinedTransformation : public QWidget

    66 {

    67     void paintEvent(QPaintEvent *);

    68 };

    69 

    70 //! [1]

    71 void CombinedTransformation::paintEvent(QPaintEvent *)

    72 {

    73     QPainter painter(this);

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

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

    76 

    77     QMatrix matrix;

    78     matrix.translate(50, 50);

    79     matrix.rotate(45);

    80     matrix.scale(0.5, 1.0);

    81     painter.setMatrix(matrix);

    82 

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

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

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

    86 }

    87 //! [1]

    88 

    89 class BasicOperations : public QWidget

    90 {

    91     void paintEvent(QPaintEvent *);

    92 };

    93 

    94 //! [2]

    95 void BasicOperations::paintEvent(QPaintEvent *)

    96 {

    97     double pi = 3.14;

    98 

    99     double a    = pi/180 * 45.0;

   100     double sina = sin(a);

   101     double cosa = cos(a);

   102 

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

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

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

   106 

   107     QMatrix matrix;

   108     matrix =  scalingMatrix * rotationMatrix * translationMatrix;

   109 

   110     QPainter painter(this);

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

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

   113 

   114     painter.setMatrix(matrix);

   115 

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

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

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

   119 }

   120 //! [2]

   121 

   122 int main(int argc, char **argv)

   123 {

   124     QApplication app(argc, argv);

   125 

   126     QWidget widget;

   127 

   128     SimpleTransformation *simpleWidget = new SimpleTransformation;

   129     CombinedTransformation *combinedWidget = new CombinedTransformation;

   130     BasicOperations *basicWidget = new BasicOperations;

   131 

   132     QVBoxLayout *layout = new QVBoxLayout;

   133     layout->addWidget(simpleWidget);

   134     layout->addWidget(combinedWidget);

   135     layout->addWidget(basicWidget);

   136     widget.setLayout(layout);

   137 

   138     widget.show();

   139     widget.resize(130, 350);

   140     return app.exec();

   141 }