Hi,
I have a strange problem. I have custom qlabel with a new paintevent function. This function will paint and connect points on a QLabel image. So far so good. This works, when I only use one label.

But if I create another label or copy the code and rename "RenderArea" to "RenderArea2", it is not working. Painting inside the first label also paints in the second label. If I raise another window, e.g. taskmanager, the application crashed. Really weired.

I hope you can understand my problem. Thanks.

Qt Code: 
  1. class RenderArea : public QLabel {
  2.     Q_OBJECT
  3.  
  4.     public:
  5.         RenderArea(QWidget *parent = 0);
  6.  
  7.     protected:
  8.         void paintEvent(QPaintEvent *event);
  9.  
  10.     private:
  11. }
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Qt Code: 
  1. void RenderArea::paintEvent(QPaintEvent *event)
  2. {
  3.         QPainter painter(this);
  4.  
  5.         painter.setRenderHint(QPainter::SmoothPixmapTransform, true );
  6.         painter.setRenderHint( QPainter::Antialiasing, true);
  7.         painter.fillRect(event->rect(), QBrush(Qt::white));
  8.         painter.translate(30, 30);
  9.         painter.save();
  10.         painter.restore();
  11.  
  12.         QPen pen;
  13.         pen.setColor(Qt::green);
  14.         pen.setWidth(4);
  15.         pen.setJoinStyle(Qt::RoundJoin);
  16.         pen.setCapStyle(Qt::RoundCap);
  17.         painter.setPen(pen);
  18.         QPoint p;
  19.         p.setX(globalX-30);
  20.         p.setY(globalY-30);
  21.  
  22.         for(int i=0; i<pValues.count();i++)
  23.         {
  24.             painter.drawPoint(pValues.at(i));
  25.             if(i > 0)
  26.             {
  27.               if(pValues.at(i).x() == pValues.at(i-1).x() && pValues.at(i).y() == pValues.at(i-1).y())
  28.               {
  29.                 i++;
  30.               }
  31.               else
  32.               {
  33.                   painter.drawLine(pValues.at(i-1), pValues.at(i));
  34.               }
  35.  
  36.  
  37.             }
  38.  
  39.         }
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pValues just stores the painted points so I can repaint them. The strange thing is that the paintevent from label1 paints also the in label2!
I also get the error message "QWidget::repaint: Recursive repaint detected".