window.cpp Example File

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 #include <QtWidgets>

 #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);
 }