Hi,
Thanks for the quick response.
Plannin inherits QMainWindow:

Qt Code: 
  1. class Planning : public QMainWindow
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I have changed the action so that it does not pass a parameter.
I have also realized that to trigger the paintEvent I need to QWidget::repaint():

Qt Code: 
  1. void Planning::paintNodes()
  2. {
  3. 	PaintNodes=true;
  4. 	QWidget::repaint();
  5. }
  6.  
  7. void Planning::paintConnections()
  8. {
  9. 	PaintConnections=true;
  10. 	QWidget::repaint();
  11. }
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My paintEvent is as follows:
Qt Code: 
  1. void Planning::paintEvent(QPaintEvent *event)
  2. {
  3. 	QPainter paintme(this);
  4. 	paintme.drawLine(QLineF(10.0, 80.0, 90.0, 20.0));
  5. }
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and it is defined in the header as such:
Qt Code: 
  1. protected: 
  2. 	void paintEvent(QPaintEvent * event);
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Now the program seems to compile but the line does not get drawn. It does not draw on the base window or even after loading of an image as a background pixmap.
Any thoughts?