Qt 5.11Qt WidgetsBasic Drawing Examplewindow.cpp Example File
Qt 5.11.1 Reference Documentation

window.cpp Example File

painting/basicdrawing/window.cpp 

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  #include "renderarea.h"
  #include "window.h"

  #include <QtWidgets>

  const int IdRole = Qt::UserRole;

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

      shapeComboBox = new QComboBox;
      shapeComboBox->addItem(tr("Polygon"), RenderArea::Polygon);
      shapeComboBox->addItem(tr("Rectangle"), RenderArea::Rect);
      shapeComboBox->addItem(tr("Rounded Rectangle"), RenderArea::RoundedRect);
      shapeComboBox->addItem(tr("Ellipse"), RenderArea::Ellipse);
      shapeComboBox->addItem(tr("Pie"), RenderArea::Pie);
      shapeComboBox->addItem(tr("Chord"), RenderArea::Chord);
      shapeComboBox->addItem(tr("Path"), RenderArea::Path);
      shapeComboBox->addItem(tr("Line"), RenderArea::Line);
      shapeComboBox->addItem(tr("Polyline"), RenderArea::Polyline);
      shapeComboBox->addItem(tr("Arc"), RenderArea::Arc);
      shapeComboBox->addItem(tr("Points"), RenderArea::Points);
      shapeComboBox->addItem(tr("Text"), RenderArea::Text);
      shapeComboBox->addItem(tr("Pixmap"), RenderArea::Pixmap);

      shapeLabel = new QLabel(tr("&Shape:"));
      shapeLabel->setBuddy(shapeComboBox);

      penWidthSpinBox = new QSpinBox;
      penWidthSpinBox->setRange(0, 20);
      penWidthSpinBox->setSpecialValueText(tr("0 (cosmetic pen)"));

      penWidthLabel = new QLabel(tr("Pen &Width:"));
      penWidthLabel->setBuddy(penWidthSpinBox);

      penStyleComboBox = new QComboBox;
      penStyleComboBox->addItem(tr("Solid"), static_cast<int>(Qt::SolidLine));
      penStyleComboBox->addItem(tr("Dash"), static_cast<int>(Qt::DashLine));
      penStyleComboBox->addItem(tr("Dot"), static_cast<int>(Qt::DotLine));
      penStyleComboBox->addItem(tr("Dash Dot"), static_cast<int>(Qt::DashDotLine));
      penStyleComboBox->addItem(tr("Dash Dot Dot"), static_cast<int>(Qt::DashDotDotLine));
      penStyleComboBox->addItem(tr("None"), static_cast<int>(Qt::NoPen));

      penStyleLabel = new QLabel(tr("&Pen Style:"));
      penStyleLabel->setBuddy(penStyleComboBox);

      penCapComboBox = new QComboBox;
      penCapComboBox->addItem(tr("Flat"), Qt::FlatCap);
      penCapComboBox->addItem(tr("Square"), Qt::SquareCap);
      penCapComboBox->addItem(tr("Round"), Qt::RoundCap);

      penCapLabel = new QLabel(tr("Pen &Cap:"));
      penCapLabel->setBuddy(penCapComboBox);

      penJoinComboBox = new QComboBox;
      penJoinComboBox->addItem(tr("Miter"), Qt::MiterJoin);
      penJoinComboBox->addItem(tr("Bevel"), Qt::BevelJoin);
      penJoinComboBox->addItem(tr("Round"), Qt::RoundJoin);

      penJoinLabel = new QLabel(tr("Pen &Join:"));
      penJoinLabel->setBuddy(penJoinComboBox);

      brushStyleComboBox = new QComboBox;
      brushStyleComboBox->addItem(tr("Linear Gradient"),
              static_cast<int>(Qt::LinearGradientPattern));
      brushStyleComboBox->addItem(tr("Radial Gradient"),
              static_cast<int>(Qt::RadialGradientPattern));
      brushStyleComboBox->addItem(tr("Conical Gradient"),
              static_cast<int>(Qt::ConicalGradientPattern));
      brushStyleComboBox->addItem(tr("Texture"), static_cast<int>(Qt::TexturePattern));
      brushStyleComboBox->addItem(tr("Solid"), static_cast<int>(Qt::SolidPattern));
      brushStyleComboBox->addItem(tr("Horizontal"), static_cast<int>(Qt::HorPattern));
      brushStyleComboBox->addItem(tr("Vertical"), static_cast<int>(Qt::VerPattern));
      brushStyleComboBox->addItem(tr("Cross"), static_cast<int>(Qt::CrossPattern));
      brushStyleComboBox->addItem(tr("Backward Diagonal"), static_cast<int>(Qt::BDiagPattern));
      brushStyleComboBox->addItem(tr("Forward Diagonal"), static_cast<int>(Qt::FDiagPattern));
      brushStyleComboBox->addItem(tr("Diagonal Cross"), static_cast<int>(Qt::DiagCrossPattern));
      brushStyleComboBox->addItem(tr("Dense 1"), static_cast<int>(Qt::Dense1Pattern));
      brushStyleComboBox->addItem(tr("Dense 2"), static_cast<int>(Qt::Dense2Pattern));
      brushStyleComboBox->addItem(tr("Dense 3"), static_cast<int>(Qt::Dense3Pattern));
      brushStyleComboBox->addItem(tr("Dense 4"), static_cast<int>(Qt::Dense4Pattern));
      brushStyleComboBox->addItem(tr("Dense 5"), static_cast<int>(Qt::Dense5Pattern));
      brushStyleComboBox->addItem(tr("Dense 6"), static_cast<int>(Qt::Dense6Pattern));
      brushStyleComboBox->addItem(tr("Dense 7"), static_cast<int>(Qt::Dense7Pattern));
      brushStyleComboBox->addItem(tr("None"), static_cast<int>(Qt::NoBrush));

      brushStyleLabel = new QLabel(tr("&Brush:"));
      brushStyleLabel->setBuddy(brushStyleComboBox);

      otherOptionsLabel = new QLabel(tr("Options:"));
      antialiasingCheckBox = new QCheckBox(tr("&Antialiasing"));
      transformationsCheckBox = new QCheckBox(tr("&Transformations"));

      connect(shapeComboBox, SIGNAL(activated(int)),
              this, SLOT(shapeChanged()));
      connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
              this, SLOT(penChanged()));
      connect(penStyleComboBox, SIGNAL(activated(int)),
              this, SLOT(penChanged()));
      connect(penCapComboBox, SIGNAL(activated(int)),
              this, SLOT(penChanged()));
      connect(penJoinComboBox, SIGNAL(activated(int)),
              this, SLOT(penChanged()));
      connect(brushStyleComboBox, SIGNAL(activated(int)),
              this, SLOT(brushChanged()));
      connect(antialiasingCheckBox, SIGNAL(toggled(bool)),
              renderArea, SLOT(setAntialiased(bool)));
      connect(transformationsCheckBox, SIGNAL(toggled(bool)),
              renderArea, SLOT(setTransformed(bool)));

      QGridLayout *mainLayout = new QGridLayout;
      mainLayout->setColumnStretch(0, 1);
      mainLayout->setColumnStretch(3, 1);
      mainLayout->addWidget(renderArea, 0, 0, 1, 4);
      mainLayout->addWidget(shapeLabel, 2, 0, Qt::AlignRight);
      mainLayout->addWidget(shapeComboBox, 2, 1);
      mainLayout->addWidget(penWidthLabel, 3, 0, Qt::AlignRight);
      mainLayout->addWidget(penWidthSpinBox, 3, 1);
      mainLayout->addWidget(penStyleLabel, 4, 0, Qt::AlignRight);
      mainLayout->addWidget(penStyleComboBox, 4, 1);
      mainLayout->addWidget(penCapLabel, 3, 2, Qt::AlignRight);
      mainLayout->addWidget(penCapComboBox, 3, 3);
      mainLayout->addWidget(penJoinLabel, 2, 2, Qt::AlignRight);
      mainLayout->addWidget(penJoinComboBox, 2, 3);
      mainLayout->addWidget(brushStyleLabel, 4, 2, Qt::AlignRight);
      mainLayout->addWidget(brushStyleComboBox, 4, 3);
      mainLayout->addWidget(otherOptionsLabel, 5, 0, Qt::AlignRight);
      mainLayout->addWidget(antialiasingCheckBox, 5, 1, 1, 1, Qt::AlignRight);
      mainLayout->addWidget(transformationsCheckBox, 5, 2, 1, 2, Qt::AlignRight);
      setLayout(mainLayout);

      shapeChanged();
      penChanged();
      brushChanged();
      antialiasingCheckBox->setChecked(true);

      setWindowTitle(tr("Basic Drawing"));
  }

  void Window::shapeChanged()
  {
      RenderArea::Shape shape = RenderArea::Shape(shapeComboBox->itemData(
              shapeComboBox->currentIndex(), IdRole).toInt());
      renderArea->setShape(shape);
  }

  void Window::penChanged()
  {
      int width = penWidthSpinBox->value();
      Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(
              penStyleComboBox->currentIndex(), IdRole).toInt());
      Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(
              penCapComboBox->currentIndex(), IdRole).toInt());
      Qt::PenJoinStyle join = Qt::PenJoinStyle(penJoinComboBox->itemData(
              penJoinComboBox->currentIndex(), IdRole).toInt());

      renderArea->setPen(QPen(Qt::blue, width, style, cap, join));
  }

  void Window::brushChanged()
  {
      Qt::BrushStyle style = Qt::BrushStyle(brushStyleComboBox->itemData(
              brushStyleComboBox->currentIndex(), IdRole).toInt());

      if (style == Qt::LinearGradientPattern) {
          QLinearGradient linearGradient(0, 0, 100, 100);
          linearGradient.setColorAt(0.0, Qt::white);
          linearGradient.setColorAt(0.2, Qt::green);
          linearGradient.setColorAt(1.0, Qt::black);
          renderArea->setBrush(linearGradient);
      } else if (style == Qt::RadialGradientPattern) {
          QRadialGradient radialGradient(50, 50, 50, 70, 70);
          radialGradient.setColorAt(0.0, Qt::white);
          radialGradient.setColorAt(0.2, Qt::green);
          radialGradient.setColorAt(1.0, Qt::black);
          renderArea->setBrush(radialGradient);
      } else if (style == Qt::ConicalGradientPattern) {
          QConicalGradient conicalGradient(50, 50, 150);
          conicalGradient.setColorAt(0.0, Qt::white);
          conicalGradient.setColorAt(0.2, Qt::green);
          conicalGradient.setColorAt(1.0, Qt::black);
          renderArea->setBrush(conicalGradient);
      } else if (style == Qt::TexturePattern) {
          renderArea->setBrush(QBrush(QPixmap(":/images/brick.png")));
      } else {
          renderArea->setBrush(QBrush(Qt::green, style));
      }
  }

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