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# window.cpp Example File
painting/transformations/window.cpp

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     #include <QtGui>

     #include "window.h"

     Window::Window()
     {
         originalRenderArea = new RenderArea;

         shapeComboBox = new QComboBox;
         shapeComboBox->addItem(tr("Clock"));
         shapeComboBox->addItem(tr("House"));
         shapeComboBox->addItem(tr("Text"));
         shapeComboBox->addItem(tr("Truck"));

         QGridLayout *layout = new QGridLayout;
         layout->addWidget(originalRenderArea, 0, 0);
         layout->addWidget(shapeComboBox, 1, 0);

         for (int i = 0; i < NumTransformedAreas; ++i) {
             transformedRenderAreas[i] = new RenderArea;

             operationComboBoxes[i] = new QComboBox;
             operationComboBoxes[i]->addItem(tr("No transformation"));
             operationComboBoxes[i]->addItem(tr("Rotate by 60\xB0"));
             operationComboBoxes[i]->addItem(tr("Scale to 75%"));
             operationComboBoxes[i]->addItem(tr("Translate by (50, 50)"));

             connect(operationComboBoxes[i], SIGNAL(activated(int)),
                     this, SLOT(operationChanged()));

             layout->addWidget(transformedRenderAreas[i], 0, i + 1);
             layout->addWidget(operationComboBoxes[i], 1, i + 1);
         }

         setLayout(layout);
         setupShapes();
         shapeSelected(0);

         setWindowTitle(tr("Transformations"));
     }

     void Window::setupShapes()
     {
         QPainterPath truck;
         truck.setFillRule(Qt::WindingFill);
         truck.moveTo(0.0, 87.0);
         truck.lineTo(0.0, 60.0);
         truck.lineTo(10.0, 60.0);
         truck.lineTo(35.0, 35.0);
         truck.lineTo(100.0, 35.0);
         truck.lineTo(100.0, 87.0);
         truck.lineTo(0.0, 87.0);
         truck.moveTo(17.0, 60.0);
         truck.lineTo(55.0, 60.0);
         truck.lineTo(55.0, 40.0);
         truck.lineTo(37.0, 40.0);
         truck.lineTo(17.0, 60.0);
         truck.addEllipse(17.0, 75.0, 25.0, 25.0);
         truck.addEllipse(63.0, 75.0, 25.0, 25.0);

         QPainterPath clock;
         clock.addEllipse(-50.0, -50.0, 100.0, 100.0);
         clock.addEllipse(-48.0, -48.0, 96.0, 96.0);
         clock.moveTo(0.0, 0.0);
         clock.lineTo(-2.0, -2.0);
         clock.lineTo(0.0, -42.0);
         clock.lineTo(2.0, -2.0);
         clock.lineTo(0.0, 0.0);
         clock.moveTo(0.0, 0.0);
         clock.lineTo(2.732, -0.732);
         clock.lineTo(24.495, 14.142);
         clock.lineTo(0.732, 2.732);
         clock.lineTo(0.0, 0.0);

         QPainterPath house;
         house.moveTo(-45.0, -20.0);
         house.lineTo(0.0, -45.0);
         house.lineTo(45.0, -20.0);
         house.lineTo(45.0, 45.0);
         house.lineTo(-45.0, 45.0);
         house.lineTo(-45.0, -20.0);
         house.addRect(15.0, 5.0, 20.0, 35.0);
         house.addRect(-35.0, -15.0, 25.0, 25.0);

         QPainterPath text;
         QFont font;
         font.setPixelSize(50);
         QRect fontBoundingRect = QFontMetrics(font).boundingRect(tr("Qt"));
         text.addText(-QPointF(fontBoundingRect.center()), font, tr("Qt"));

         shapes.append(clock);
         shapes.append(house);
         shapes.append(text);
         shapes.append(truck);

         connect(shapeComboBox, SIGNAL(activated(int)),
                 this, SLOT(shapeSelected(int)));
     }

     void Window::operationChanged()
     {
         static const Operation operationTable[] = {
             NoTransformation, Rotate, Scale, Translate
         };

         QList<Operation> operations;
         for (int i = 0; i < NumTransformedAreas; ++i) {
             int index = operationComboBoxes[i]->currentIndex();
             operations.append(operationTable[index]);
             transformedRenderAreas[i]->setOperations(operations);
         }
     }

     void Window::shapeSelected(int index)
     {
         QPainterPath shape = shapes[index];
         originalRenderArea->setShape(shape);
         for (int i = 0; i < NumTransformedAreas; ++i)
             transformedRenderAreas[i]->setShape(shape);
     }