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# window.cpp Example File
painting/basicdrawing/window.cpp

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     #include <QtGui>

     #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("Round Rectangle"), RenderArea::RoundRect);
         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 Style:"));
         brushStyleLabel->setBuddy(brushStyleComboBox);

         otherOptionsLabel = new QLabel(tr("Other 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->setRowMinimumHeight(1, 6);
         mainLayout->addWidget(shapeLabel, 2, 1, Qt::AlignRight);
         mainLayout->addWidget(shapeComboBox, 2, 2);
         mainLayout->addWidget(penWidthLabel, 3, 1, Qt::AlignRight);
         mainLayout->addWidget(penWidthSpinBox, 3, 2);
         mainLayout->addWidget(penStyleLabel, 4, 1, Qt::AlignRight);
         mainLayout->addWidget(penStyleComboBox, 4, 2);
         mainLayout->addWidget(penCapLabel, 5, 1, Qt::AlignRight);
         mainLayout->addWidget(penCapComboBox, 5, 2);
         mainLayout->addWidget(penJoinLabel, 6, 1, Qt::AlignRight);
         mainLayout->addWidget(penJoinComboBox, 6, 2);
         mainLayout->addWidget(brushStyleLabel, 7, 1, Qt::AlignRight);
         mainLayout->addWidget(brushStyleComboBox, 7, 2);
         mainLayout->setRowMinimumHeight(8, 6);
         mainLayout->addWidget(otherOptionsLabel, 9, 1, Qt::AlignRight);
         mainLayout->addWidget(antialiasingCheckBox, 9, 2);
         mainLayout->addWidget(transformationsCheckBox, 10, 2);
         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));
         }
     }