Hallo, I'm a beginner and use Qt 4.4.3.
I would like to draw a point in a scene when i click in the scene. but my program draws a point without clicking, but the point should appear if i click.
I hope somebody can help me.
Here is my program:

Qt Code: 
  1. class StarItem : public QGraphicsItem
  2. {
  3. public:
  4.       StarItem( QGraphicsItem *parent = 0 ) : QGraphicsItem(parent) {}
  5.       void paint( QPainter *, const QStyleOptionGraphicsItem *, QWidget *widget=0 );
  6.       QRectF boundingRect() const;
  7. protected:
  8. 	void mousePressEvent(QGraphicsSceneMouseEvent *e);
  9. 	void mouseMoveEvent(QGraphicsSceneMouseEvent *e);
  10. private:
  11. 	QPoint position;
  12. 	int posx;
  13. 	int posy;
  14. 	bool shower;
  15. };
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Qt Code: 
  1. #include "staritem.h"
  2.  
  3. void StarItem::mousePressEvent(QGraphicsSceneMouseEvent *e)
  4. {
  5. if (e->button() == Qt::LeftButton)
  6. {
  7. shower=true;
  8. QPoint position = e->screenPos();
  9.  
  10. posx = position.x();
  11. posy = position.y();
  12. update();
  13. }
  14. return QGraphicsItem::mousePressEvent(e);
  15. }
  16.  
  17. void StarItem::mouseMoveEvent(QGraphicsSceneMouseEvent *e)
  18. {
  19. position = e->screenPos();
  20. return QGraphicsItem::mouseMoveEvent(e);
  21. }
  22.  
  23.  
  24. void StarItem::paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget )
  25. {
  26.  Q_UNUSED( option );
  27.  Q_UNUSED( widget );
  28.  
  29.  QPen pen(Qt::black, 6, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
  30.  painter->setPen(pen);
  31.  
  32. if(shower=true)
  33. {
  34. painter->drawPoint(posx,posy);
  35. }
  36.  
  37. }
  38.  
  39. QRectF StarItem::boundingRect() const
  40. {
  41.    return QRectF( 0, 0, 100, 100 );
  42. }
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I have no idea what's wrong...