QPointF - draw only 30% of window

[pajczur]

Hello,
I wonder. "Width" of QWidget is in what resolution?
I mean:

ui::QWidget::width()

ui::QWidget::width()

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It will return value in what units?

I have code that dinamically draws (by QPainter) QPointF (many of them).
And for my horizontal coordinate I have that code:

QPointF point;
 
for(int i=1; i<something; i++)
{
point.setX(i);
}

QPointF point;

for(int i=1; i<something; i++)
{
point.setX(i);
}

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And my aim is to use "something" as a resolution. So for example: no matter how big is "something", my points always fill evenly for example 30% of my widget. But that doesn't work:

ui::QWidget::width() * 0.3

ui::QWidget::width() * 0.3

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Because QPointF is in different units than widget width.