A simple way around this is to add a child widget to the scrollview and do all the drawing in the paint event of the widget.

Qt Code: 
  1. class MyWidget : public QWidget{
  2. public:
  3.   MyWidget(QWidget *parent = 0) : QWidget(parent){}
  4. protected:
  5.   void paintEvent(QPaintEvent *pe){
  6.     //...
  7.   }
  8. };
  9. //...
  10. wid = new MyWidget(viewport());
  11. wid.resize(600, 400);
  12. //...
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