[Interest] Qt mouse poll rate too slow

[Joshua Grauman]

Hello all,

I'm running into a problem where the mouse (and touchscreen) poll rate is 
too slow for my application. At first I thought it was the device (mouse 
and/or touchscreen), but after trying in different apps, I discovered it 
is Qt. I am simply subclassing a QLabel and adding points to a 
QPainterPath in mouseMoveEvent like this:

MyLabel::mouseMoveEvent(QMouseEvent *e)
{
   if(mouseState==1)
   {
     addPoint(e->pos());
     update();
   }
}

The QPainterPath looks fine when you move the mouse/touchscreen slowly, 
but when moving quickly you can see discrete points at quite a distance 
apart. Is there any way to get Qt to poll faster? Any other ideas for 
getting better precision for mouse events? Thanks!

Josh