Qt Reference Documentation

# window.cpp Example File

painting/painterpaths/window.cpp

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     #include <QtGui>

     #include <math.h>

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

     const float Pi = 3.14159f;

     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.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", 50);
         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);
         renderAreas[1] = new RenderArea(roundRectPath);
         renderAreas[2] = new RenderArea(ellipsePath);
         renderAreas[3] = new RenderArea(piePath);
         renderAreas[4] = new RenderArea(polygonPath);
         renderAreas[5] = new RenderArea(groupPath);
         renderAreas[6] = new RenderArea(textPath);
         renderAreas[7] = new RenderArea(bezierPath);
         renderAreas[8] = new RenderArea(starPath);
         Q_ASSERT(NumRenderAreas == 9);

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

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

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

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

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

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

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

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

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

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

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

         rotationAngleLabel = new QLabel(tr("&Rotation Angle:"));
         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;
         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);
         setLayout(mainLayout);

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

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

     void Window::fillRuleChanged()
     {
         Qt::FillRule rule = (Qt::FillRule)currentItemData(fillRuleComboBox).toInt();

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

     void Window::fillGradientChanged()
     {
         QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
         QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));

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

     void Window::penColorChanged()
     {
         QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));

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

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

     QVariant Window::currentItemData(QComboBox *comboBox)
     {
         return comboBox->itemData(comboBox->currentIndex());
     }