Paint Event does not correspond to coordinates!

[ebsaith]

Good Day,

I'm struggling with resizing my paint event!

In my constructor:

qLabel::qLabel(QWidget *parent) :
    QLabel(parent), windowSize(333, 494)   
{...   
    QRect rect;
    rect.setTopLeft(QPoint(9, 9));
    rect.setSize(windowSize);
    setGeometry(rect);
}

qLabel::qLabel(QWidget *parent) :
    QLabel(parent), windowSize(333, 494)   
{...   
    QRect rect;
    rect.setTopLeft(QPoint(9, 9));
    rect.setSize(windowSize);
    setGeometry(rect);
}

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In my paint event

void mmetLabel::paintEvent(QPaintEvent *ev)
{
    QLabel::paintEvent(ev);
    QPainter painter(this);
 
    qreal sx = ev->rect().width() / (qreal)windowSize.width();
    qreal sy = ev->rect().height() / (qreal)windowSize.height();
    painter.scale(sx, sy);
...
    //draw points and lines between every 2 consective points
}

void mmetLabel::paintEvent(QPaintEvent *ev)
{
    QLabel::paintEvent(ev);
    QPainter painter(this);

    qreal sx = ev->rect().width() / (qreal)windowSize.width();
    qreal sy = ev->rect().height() / (qreal)windowSize.height();
    painter.scale(sx, sy);
...
    //draw points and lines between every 2 consective points
}

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Once I click on my label, I display the coordinates of the mouse ->working
Label also displays the 1st point and 2nd point coordinates -> working

My Paintevent -> NOT Working accordingly

It draws points not where mouse is clicked, hence the lines are completely not right
example, If I click at point1 (x=100, y=100) & click point2(x=152, y=251)
it draws a line from (x=230, y=128) -> (x=351, y=195) = completely wrong!

Please help
Kind Regards
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