window.cpp Example File

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  #include "window.h"

  #include <QComboBox>
  #include <QGridLayout>

  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\xC2\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);
  }