Hello, I think I get it now. Thanks! On Mon, Dec 14, 2015 at 5:50 PM, Sean Harmer <sean.har...@kdab.com> wrote:
> Hi, > > On Monday 14 Dec 2015 17:36:55 Nye wrote: > > Hello Sean, > > Thanks, that mostly clears things up. Only one additional question: > > How are they normalized, to the window/opengl surface size that I have > > passed to the aspect engine? > > It's normalised to the [1,1] based purely upon sensitivity rather than > pixel > size of the surface. The respective code is in mousecontroller.cpp, in the > function updateMouseEvents(): > > m_mouseState.xAxis = m_sensitivity * (e.screenPos().x() - > m_previousPos.x()); > m_mouseState.yAxis = m_sensitivity * (m_previousPos.y() - > e.screenPos().y()); > > The xAxis and yAxis values are later clamped to [-1, 1]. > > So setting the sensitivity to 0.1 means you have to move 10 pixels in a > frame > to get an axis value of magnitude 1. > > Of course once you have the axis value you can scale or transform it how > you > like. > > Cheers, > > Sean > > > > > Kind regards. > > > > On Mon, Dec 14, 2015 at 3:11 PM, Sean Harmer <sean.har...@kdab.com> > wrote: > > > On Monday 14 Dec 2015 12:30:40 Nye wrote: > > > > Hello, > > > > I understood (by trial and error) that in the axisValueChanged > signal I > > > > > > get > > > > > > > a relative offset. I incorrectly assumed it was an absolute value. > Is it > > > > scaled or bound somehow, in example to the screen resolution, or is > the > > > > value absolute (I'm using it with a mouse device)? Additionally, I'd > > > > like > > > > to know what is the measurement used, does it come in pixels, or some > > > > arbitrary units? > > > > > > The values are normalised units [-1, 1]. How these are mapped from > pixel > > > offsets reported by the windowing system is controlled by the > sensitivity > > > property on the MouseController. > > > > > > Cheers, > > > > > > Sean > > > > > > -- > > > Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK > > > KDAB (UK) Ltd, a KDAB Group company > > > Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090 > > > Mobile: +44 (0)7545 140604 > > > KDAB - Qt Experts > > -- > Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK > KDAB (UK) Ltd, a KDAB Group company > Tel. +44 (0)1625 809908; Sweden (HQ) +46-563-540090 > Mobile: +44 (0)7545 140604 > KDAB - Qt Experts >
_______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
