QPainter - drawing new graphics without removing old stuff

[wysota]

I want a delay of 0.5 seconds before drawing each point, hence the timer. Not sure how this'd work out if I had the list of all 200 points in an array... code snippet anyone?

void X::timerEvent(QTimerEvent *te){
  QPoint pt(qRand()%width(), qRand()%height());
  points << pt; // assuming "points" is a QList<QPoint> class member
  update();
}
 
void X::paintEvent(QPaintEvent *pe){
  QPainter p(this);
  QPen pe = p.pen();
  pe.setWidth(2);
  p.setPen(pe);
  foreach(const QPoint &pt, points){
    p.drawPoint(pt);
  }
}

void X::timerEvent(QTimerEvent *te){
  QPoint pt(qRand()%width(), qRand()%height());
  points << pt; // assuming "points" is a QList<QPoint> class member
  update();
}

void X::paintEvent(QPaintEvent *pe){
  QPainter p(this);
  QPen pe = p.pen();
  pe.setWidth(2);
  p.setPen(pe);
  foreach(const QPoint &pt, points){
    p.drawPoint(pt);
  }
}

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