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 #include &lt;QtGui&gt;

 #include &quot;circlewidget.h&quot;
 #include &quot;window.h&quot;

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

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

     QTimer *timer = new QTimer(this);

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

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

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

     setWindowTitle(tr(&quot;Concentric Circles&quot;));
 }

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