Draw dashline of 1 px width and opaque

[Taytoo]

In paintevent(), I'm trying to draw horizontal Dash line of exactly 1 pixel width, but its being drawn 2 pixels wide and not opaque. Not sure what's going on.

QPen pen;
pen.setColor(QColor::fromRgb(0, 0, 140));
pen.setStyle(Qt::PenStyle::DashLine);
pen.setWidth(0);
pen.setCosmetic(true);	

Noticed another thing, seeing this issue when using drawLine, but when I use drawLines then the line width is 1px and color opaque.

[Taytoo]

Turns out it was AntiAlias rendering hint that was causing it. Turning it off before drawing lines, results in proper 1 pixel line.