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 #include &lt;QtGui&gt;

 #include &quot;coloritem.h&quot;

 ColorItem::ColorItem()
     : color(qrand() % 256, qrand() % 256, qrand() % 256)
 {
     setToolTip(QString(&quot;QColor(%1, %2, %3)\n%4&quot;)
               .arg(color.red()).arg(color.green()).arg(color.blue())
               .arg(&quot;Click and drag this color onto the robot!&quot;));
     setCursor(Qt::OpenHandCursor);
 }

 QRectF ColorItem::boundingRect() const
 {
     return QRectF(-15.5, -15.5, 34, 34);
 }

 void ColorItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(option);
     Q_UNUSED(widget);
     painter-&gt;setPen(Qt::NoPen);
     painter-&gt;setBrush(Qt::darkGray);
     painter-&gt;drawEllipse(-12, -12, 30, 30);
     painter-&gt;setPen(QPen(Qt::black, 1));
     painter-&gt;setBrush(QBrush(color));
     painter-&gt;drawEllipse(-15, -15, 30, 30);
 }

 void ColorItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
     if (event-&gt;button() != Qt::LeftButton) {
         event-&gt;ignore();
         return;
     }

     setCursor(Qt::ClosedHandCursor);
 }

 void ColorItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 {
     if (QLineF(event-&gt;screenPos(), event-&gt;buttonDownScreenPos(Qt::LeftButton))
         .length() &lt; QApplication::startDragDistance()) {
         return;
     }

     QDrag *drag = new QDrag(event-&gt;widget());
     QMimeData *mime = new QMimeData;
     drag-&gt;setMimeData(mime);

     static int n = 0;
     if (n++ &gt; 2 &amp;&amp; (qrand() % 3) == 0) {
         QImage image(&quot;:/images/head.png&quot;);
         mime-&gt;setImageData(image);

         drag-&gt;setPixmap(QPixmap::fromImage(image).scaled(30, 40));
         drag-&gt;setHotSpot(QPoint(15, 30));
     } else {
         mime-&gt;setColorData(color);
         mime-&gt;setText(QString(&quot;#%1%2%3&quot;)
                       .arg(color.red(), 2, 16, QLatin1Char('0'))
                       .arg(color.green(), 2, 16, QLatin1Char('0'))
                       .arg(color.blue(), 2, 16, QLatin1Char('0')));

         QPixmap pixmap(34, 34);
         pixmap.fill(Qt::white);

         QPainter painter(&amp;pixmap);
         painter.translate(15, 15);
         painter.setRenderHint(QPainter::Antialiasing);
         paint(&amp;painter, 0, 0);
         painter.end();

         pixmap.setMask(pixmap.createHeuristicMask());

         drag-&gt;setPixmap(pixmap);
         drag-&gt;setHotSpot(QPoint(15, 20));
     }

     drag-&gt;exec();
     setCursor(Qt::OpenHandCursor);
 }

 void ColorItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *)
 {
     setCursor(Qt::OpenHandCursor);
 }</pre>
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