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

        #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(this);
            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(this);
                    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);

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

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