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

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     #include <QtGui>

     #include "circlewidget.h"
     #include "window.h"

     Window::Window()
     {
         aliasedLabel = createLabel(tr("Aliased"));
         antialiasedLabel = createLabel(tr("Antialiased"));
         intLabel = createLabel(tr("Int"));
         floatLabel = createLabel(tr("Float"));

         QGridLayout *layout = new QGridLayout;
         layout->addWidget(aliasedLabel, 0, 1);
         layout->addWidget(antialiasedLabel, 0, 2);
         layout->addWidget(intLabel, 1, 0);
         layout->addWidget(floatLabel, 2, 0);

         QTimer *timer = new QTimer(this);

         for (int i = 0; i < 2; ++i) {
             for (int j = 0; j < 2; ++j) {
                 circleWidgets[i][j] = new CircleWidget;
                 circleWidgets[i][j]->setAntialiased(j != 0);
                 circleWidgets[i][j]->setFloatBased(i != 0);

                 connect(timer, SIGNAL(timeout()),
                         circleWidgets[i][j], SLOT(nextAnimationFrame()));

                 layout->addWidget(circleWidgets[i][j], i + 1, j + 1);
             }
         }
         timer->start(100);
         setLayout(layout);

         setWindowTitle(tr("Concentric Circles"));
     }

     QLabel *Window::createLabel(const QString &text)
     {
         QLabel *label = new QLabel(text);
         label->setAlignment(Qt::AlignCenter);
         label->setMargin(2);
         label->setFrameStyle(QFrame::Box | QFrame::Sunken);
         return label;
     }