Thanks Peter I appreciate your time and help and I will look into it
Dan On Tue, Apr 21, 2015 at 10:38 PM, Peter Hutterer <peter.hutte...@who-t.net> wrote: > On Tue, Apr 21, 2015 at 02:50:47PM +0100, Daniel Harris wrote: > > Hello Peter > > > > I appreciate your reply. I am not sure we are talking about the same > thing > > so I have uploaded a video to youtube showing the problem i am > experiencing > > > > If anyone is interested you can find it here http://youtu.be/n8N0NnB9u7g > > yeah, definitely the same thing. look at the distances of the pointer and > the stylus relative to their origins - when the stylus is half-way down the > device, the pointer is half-way down the whole screen. That's the basic > problem - an absolute device is always mapped to the whole screen/desktop > area. > > > are you saying the pointer position can be corrected with a client app or > > can it only be fixed in X. > > yes, google for xinput coordinate transformation matrix and you'll find a > few tutorials, hints on how to do it. xinput map-to-output does the same, > though in your case it's a bit trickier because you need to get the > viewport and calculate the respective matrix. Still just moving numbers > around, not technically hard. > > the difficult bit is getting the current viewport, where the xf86VidMode > extension looks like the most likely candidate. possibly RandR, but I don't > know the details on how to do it on either, sorry. > > Cheers, > Peter > > > > On Tue, Apr 21, 2015 at 2:41 AM, Peter Hutterer < > peter.hutte...@who-t.net> > > wrote: > > > > > On Mon, Apr 20, 2015 at 05:21:44PM +0100, Daniel Harris wrote: > > > > I am assuming that it is a limitation that a stylus cannot map it > > > position > > > > to a physical screen and a larger virtual screen at the same time. I > > > > currently have panning in the virtual screen but calibration is way > off > > > on > > > > the physical screen. I am assuming no mathematical wizardry with the > > > > current setting can rectify this. > > > > > > should be able to, it just requires more effort once you start panning > > > around. the mapping of the stylus to screen is done by a matrix that > takes > > > the whole desktop size into account. outputs as such don't matter here, > > > e.g. > > > mapping to the right of two monitors is done by mapping to the 50% of > the > > > width with a 50% offset. > > > > > > that means you can map to any part of the desktop, problem is it won't > > > follow you around as you pan. you'd need some client to track that and > > > update the coordinate transformation matrix as you go. > > > > > > Cheers, > > > Peter > > > > > > > > > > On Sat, Apr 18, 2015 at 4:19 PM, Daniel Harris < > > > mail.dhar...@googlemail.com> > > > > wrote: > > > > > > > > > Hello > > > > > > > > > > I have a surface pro 2 and would like to create a virtual screen of > > > > > 3840x2160 and pan around using the 1920x1080 stylus enabled > > > touchscreen on > > > > > the surface pro 2. I have Ubuntu installed and the screen setup > but I > > > > > cannot get the stylus to function correctly with that setup. I > have > > > tried > > > > > experimenting with the translation matrix but with no success. > > > > > > > > > > Is the above setup possible? > > > > > > > > > > I would welcome any advice as to how to achieve this setup > > > > > > > > > > Thanks in advance > > > > > > > > > > Dan > > > > > > > > > > > > _______________________________________________ > > > > xorg@lists.x.org: X.Org support > > > > Archives: http://lists.freedesktop.org/archives/xorg > > > > Info: http://lists.x.org/mailman/listinfo/xorg > > > > Your subscription address: %(user_address)s > > > > > > >
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