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

        #include <QtGui>

        #include <math.h>

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

        const int IdRole = QAbstractItemModel::UserRole;
        const int ColorRole = QAbstractItemModel::UserRole + 1;
        const float Pi = 3.14159;

        Window::Window()
        {
            QPainterPath rectPath;
            rectPath.moveTo(20.0, 30.0);
            rectPath.lineTo(80.0, 30.0);
            rectPath.lineTo(80.0, 70.0);
            rectPath.lineTo(20.0, 70.0);
            rectPath.closeSubpath();

            QPainterPath roundRectPath;
            roundRectPath.moveTo(80.0, 35.0);
            roundRectPath.arcTo(70.0, 30.0, 10.0, 10.0, 0.0, 90.0);
            roundRectPath.lineTo(25.0, 30.0);
            roundRectPath.arcTo(20.0, 30.0, 10.0, 10.0, 90.0, 90.0);
            roundRectPath.lineTo(20.0, 65.0);
            roundRectPath.arcTo(20.0, 60.0, 10.0, 10.0, 180.0, 90.0);
            roundRectPath.lineTo(75.0, 70.0);
            roundRectPath.arcTo(70.0, 60.0, 10.0, 10.0, 270.0, 90.0);
            roundRectPath.closeSubpath();

            QPainterPath ellipsePath;
            ellipsePath.moveTo(80.0, 50.0);
            ellipsePath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0);

            QPainterPath piePath;
            piePath.moveTo(50.0, 50.0);
            piePath.lineTo(65.0, 32.6795);
            piePath.arcTo(20.0, 30.0, 60.0, 40.0, 60.0, 240.0);
            piePath.closeSubpath();

            QPainterPath polygonPath;
            polygonPath.moveTo(10.0, 80.0);
            polygonPath.lineTo(20.0, 10.0);
            polygonPath.lineTo(80.0, 30.0);
            polygonPath.lineTo(90.0, 70.0);
            polygonPath.closeSubpath();

            QPainterPath groupPath;
            groupPath.moveTo(60.0, 40.0);
            groupPath.arcTo(20.0, 20.0, 40.0, 40.0, 0.0, 360.0);
            groupPath.moveTo(40.0, 40.0);
            groupPath.lineTo(40.0, 80.0);
            groupPath.lineTo(80.0, 80.0);
            groupPath.lineTo(80.0, 40.0);
            groupPath.closeSubpath();

            QPainterPath textPath;
            QFont timesFont("Times", 60);
            timesFont.setStyleStrategy(QFont::ForceOutline);
            textPath.addText(10, 70, timesFont, tr("Qt"));

            QPainterPath bezierPath;
            bezierPath.moveTo(20, 30);
            bezierPath.cubicTo(80, 0, 50, 50, 80, 80);

            QPainterPath starPath;
            starPath.moveTo(90, 50);
            for (int i = 1; i < 5; ++i) {
                starPath.lineTo(50 + 40 * cos(0.8 * i * Pi),
                                50 + 40 * sin(0.8 * i * Pi));
            }
            starPath.closeSubpath();

            renderAreas[0] = new RenderArea(rectPath, this);
            renderAreas[1] = new RenderArea(roundRectPath, this);
            renderAreas[2] = new RenderArea(ellipsePath, this);
            renderAreas[3] = new RenderArea(piePath, this);
            renderAreas[4] = new RenderArea(polygonPath, this);
            renderAreas[5] = new RenderArea(groupPath, this);
            renderAreas[6] = new RenderArea(textPath, this);
            renderAreas[7] = new RenderArea(bezierPath, this);
            renderAreas[8] = new RenderArea(starPath, this);
            Q_ASSERT(NumRenderAreas == 9);

            fillRuleComboBox = new QComboBox(this);
            addItem(fillRuleComboBox, tr("Odd Even"), Qt::OddEvenFill);
            addItem(fillRuleComboBox, tr("Winding"), Qt::WindingFill);

            fillRuleLabel = new QLabel(tr("Fill &Rule:"), this);
            fillRuleLabel->setBuddy(fillRuleComboBox);

            fillColor1ComboBox = new QComboBox(this);
            populateWithColors(fillColor1ComboBox);
            fillColor1ComboBox->setCurrentIndex(
                    fillColor1ComboBox->findText("mediumslateblue"));

            fillColor2ComboBox = new QComboBox(this);
            populateWithColors(fillColor2ComboBox);
            fillColor2ComboBox->setCurrentIndex(
                    fillColor2ComboBox->findText("cornsilk"));

            fillGradientLabel = new QLabel(tr("&Fill Gradient:"), this);
            fillGradientLabel->setBuddy(fillColor1ComboBox);

            fillToLabel = new QLabel(tr("to"), this);
            fillToLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

            penWidthSpinBox = new QSpinBox(this);
            penWidthSpinBox->setRange(0, 20);

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

            penColorComboBox = new QComboBox(this);
            populateWithColors(penColorComboBox);
            penColorComboBox->setCurrentIndex(
                    penColorComboBox->findText("darkslateblue"));

            penColorLabel = new QLabel(tr("Pen &Color:"), this);
            penColorLabel->setBuddy(penColorComboBox);

            rotationAngleSpinBox = new QSpinBox(this);
            rotationAngleSpinBox->setRange(0, 359);
            rotationAngleSpinBox->setWrapping(true);
            rotationAngleSpinBox->setSuffix("\xB0");

            rotationAngleLabel = new QLabel(tr("&Rotation Angle:"), this);
            rotationAngleLabel->setBuddy(rotationAngleSpinBox);

            connect(fillRuleComboBox, SIGNAL(activated(int)),
                    this, SLOT(fillRuleChanged()));
            connect(fillColor1ComboBox, SIGNAL(activated(int)),
                    this, SLOT(fillGradientChanged()));
            connect(fillColor2ComboBox, SIGNAL(activated(int)),
                    this, SLOT(fillGradientChanged()));
            connect(penColorComboBox, SIGNAL(activated(int)),
                    this, SLOT(penColorChanged()));

            for (int i = 0; i < NumRenderAreas; ++i) {
                connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
                        renderAreas[i], SLOT(setPenWidth(int)));
                connect(rotationAngleSpinBox, SIGNAL(valueChanged(int)),
                        renderAreas[i], SLOT(setRotationAngle(int)));
            }

            QGridLayout *topLayout = new QGridLayout;
            for (int i = 0; i < NumRenderAreas; ++i)
                topLayout->addWidget(renderAreas[i], i / 3, i % 3);

            QGridLayout *mainLayout = new QGridLayout(this);
            mainLayout->addLayout(topLayout, 0, 0, 1, 4);
            mainLayout->addWidget(fillRuleLabel, 1, 0);
            mainLayout->addWidget(fillRuleComboBox, 1, 1, 1, 3);
            mainLayout->addWidget(fillGradientLabel, 2, 0);
            mainLayout->addWidget(fillColor1ComboBox, 2, 1);
            mainLayout->addWidget(fillToLabel, 2, 2);
            mainLayout->addWidget(fillColor2ComboBox, 2, 3);
            mainLayout->addWidget(penWidthLabel, 3, 0);
            mainLayout->addWidget(penWidthSpinBox, 3, 1, 1, 3);
            mainLayout->addWidget(penColorLabel, 4, 0);
            mainLayout->addWidget(penColorComboBox, 4, 1, 1, 3);
            mainLayout->addWidget(rotationAngleLabel, 5, 0);
            mainLayout->addWidget(rotationAngleSpinBox, 5, 1, 1, 3);

            fillRuleChanged();
            fillGradientChanged();
            penColorChanged();
            penWidthSpinBox->setValue(2);

            setWindowTitle(tr("Painter Paths"));
        }

        void Window::fillRuleChanged()
        {
            Qt::FillRule rule =
                (Qt::FillRule)fillRuleComboBox->itemData(fillRuleComboBox->currentIndex(), IdRole).toInt();

            for (int i = 0; i < NumRenderAreas; ++i)
                renderAreas[i]->setFillRule(rule);
        }

        void Window::fillGradientChanged()
        {
            QColor color1 = qvariant_cast<QColor>(fillColor1ComboBox->itemData(
                        fillColor1ComboBox->currentIndex(), ColorRole));
            QColor color2 = qvariant_cast<QColor>(fillColor2ComboBox->itemData(
                    fillColor2ComboBox->currentIndex(), ColorRole));

            for (int i = 0; i < NumRenderAreas; ++i)
                renderAreas[i]->setFillGradient(color1, color2);
        }

        void Window::penColorChanged()
        {
            QColor color =
                qvariant_cast<QColor>(penColorComboBox->itemData(penColorComboBox->currentIndex(), ColorRole));

            for (int i = 0; i < NumRenderAreas; ++i)
                renderAreas[i]->setPenColor(color);
        }

        void Window::addItem(QComboBox *comboBox, const QString &text, int id)
        {
            int row = comboBox->count();
            comboBox->insertItem(row, text);
            comboBox->setItemData(row, id, IdRole);
        }

        void Window::addColor(QComboBox *comboBox, const QString &text,
                              const QColor &color)
        {
            int row = comboBox->count();
            comboBox->insertItem(row, text);
            comboBox->setItemData(row, qVariantFromValue(color), ColorRole);
        }

        void Window::populateWithColors(QComboBox *comboBox)
        {
            QStringList colorNames = QColor::colorNames();
            foreach (QString name, colorNames)
                addColor(comboBox, name, QColor(name));
        }