[Interest] [Qt3D] QAxisActionHandler axis value bounds

[Nye]

Hello,
I think I get it now. Thanks!

On Mon, Dec 14, 2015 at 5:50 PM, Sean Harmer <sean.harmer at 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.harmer at 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.harmer at 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.harmer at 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
>
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