Qt 5.9 | Qt Widgets | Transformations Example | window.cpp Example File

Qt 5.9.9 Reference Documentation

# window.cpp Example File

painting/transformations/window.cpp

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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);
      }