QPen has no effect

[timmu]

I'm drawing an image (see below) and it works in principle. However, for some reason two of the commands don't make any difference as if they weren't seen by the compiler. Does anyone have any ideas why?

QPixmap map(100,100);
 
  map.fill(Qt::white);
  QPainter p(&map);
  QPen pen;
   pen.setStyle(Qt::DashDotLine);//doesn't make a difference
   pen.setWidth(3); //doesn't make a difference
   p.setPen(QColor(0,0,0)); 
 
  p.drawLine(50,50,100,100);
 
map.save("file.jpg", 0, 90);

QPixmap map(100,100);
 
  map.fill(Qt::white);
  QPainter p(&map);
  QPen pen;
   pen.setStyle(Qt::DashDotLine);//doesn't make a difference
   pen.setWidth(3); //doesn't make a difference
   p.setPen(QColor(0,0,0)); 

  p.drawLine(50,50,100,100);

map.save("file.jpg", 0, 90);

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[Santosh Reddy]

QPixmap map(100,100);
 
map.fill(Qt::white);
QPainter p(&map);
QPen pen;
pen = p.pen();
pen.setStyle(Qt::DashDotLine);
pen.setWidth(3);
pen.setColor(QColor(0,0,0));
p.setPen(pen);
p.drawLine(50,50,100,100);
 
map.save("file.jpg", 0, 90);

QPixmap map(100,100);

map.fill(Qt::white);
QPainter p(&map);
QPen pen;
pen = p.pen();
pen.setStyle(Qt::DashDotLine);
pen.setWidth(3);
pen.setColor(QColor(0,0,0));
p.setPen(pen);
p.drawLine(50,50,100,100);

map.save("file.jpg", 0, 90);

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