Keep pixels Highlighted wherever cursor moved after entering the widget.

[learner_qt]

I want to highlight all the pixels where cursor moved after entering the widget and before leaving it.
On reimplementing the paintEvent and using drawPoint, I am able to display the current cursor position. But I dont want old points to disappear. How do i keep all previous points also highlighted???
I am not successful in using drawPath and drawPoints for this.

Lines::Lines(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Lines)
{
    ui->setupUi(this);
}
 
 
void Lines::paintEvent(QPaintEvent *e)
{
  QPainter qp(this);
  drawLines(&qp);
 }
 
 
void Lines::drawLines(QPainter *qp)
{
   QPen pen2(Qt::red, 8, Qt::SolidLine);
   qp->setPen(pen2);
 
    int x;
    int y;
 
    QPoint p = QCursor::pos();
    x = p.x();
    y= p.y();
 
   qp->drawPoint(p);
   this->update();
}

Lines::Lines(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Lines)
{
    ui->setupUi(this);
}


void Lines::paintEvent(QPaintEvent *e)
{
  QPainter qp(this);
  drawLines(&qp);
 }


void Lines::drawLines(QPainter *qp)
{
   QPen pen2(Qt::red, 8, Qt::SolidLine);
   qp->setPen(pen2);

    int x;
    int y;

    QPoint p = QCursor::pos();
    x = p.x();
    y= p.y();

   qp->drawPoint(p);
   this->update();
}

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