window.cpp Example File

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 #include <QtWidgets>

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

 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"), Qt::SolidLine);
     penStyleComboBox->addItem(tr("Dash"), Qt::DashLine);
     penStyleComboBox->addItem(tr("Dot"), Qt::DotLine);
     penStyleComboBox->addItem(tr("Dash Dot"), Qt::DashDotLine);
     penStyleComboBox->addItem(tr("Dash Dot Dot"), Qt::DashDotDotLine);
     penStyleComboBox->addItem(tr("None"), 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"),
             Qt::LinearGradientPattern);
     brushStyleComboBox->addItem(tr("Radial Gradient"),
             Qt::RadialGradientPattern);
     brushStyleComboBox->addItem(tr("Conical Gradient"),
             Qt::ConicalGradientPattern);
     brushStyleComboBox->addItem(tr("Texture"), Qt::TexturePattern);
     brushStyleComboBox->addItem(tr("Solid"), Qt::SolidPattern);
     brushStyleComboBox->addItem(tr("Horizontal"), Qt::HorPattern);
     brushStyleComboBox->addItem(tr("Vertical"), Qt::VerPattern);
     brushStyleComboBox->addItem(tr("Cross"), Qt::CrossPattern);
     brushStyleComboBox->addItem(tr("Backward Diagonal"), Qt::BDiagPattern);
     brushStyleComboBox->addItem(tr("Forward Diagonal"), Qt::FDiagPattern);
     brushStyleComboBox->addItem(tr("Diagonal Cross"), Qt::DiagCrossPattern);
     brushStyleComboBox->addItem(tr("Dense 1"), Qt::Dense1Pattern);
     brushStyleComboBox->addItem(tr("Dense 2"), Qt::Dense2Pattern);
     brushStyleComboBox->addItem(tr("Dense 3"), Qt::Dense3Pattern);
     brushStyleComboBox->addItem(tr("Dense 4"), Qt::Dense4Pattern);
     brushStyleComboBox->addItem(tr("Dense 5"), Qt::Dense5Pattern);
     brushStyleComboBox->addItem(tr("Dense 6"), Qt::Dense6Pattern);
     brushStyleComboBox->addItem(tr("Dense 7"), Qt::Dense7Pattern);
     brushStyleComboBox->addItem(tr("None"), 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));
     }
 }