Re: XInput transform matrix
On Thu, Jun 14, 2012 at 02:43:30PM +1000, Peter Hutterer wrote: > On Wed, Jun 13, 2012 at 05:46:19PM +0200, Cedric Sodhi wrote: > > Can anyone tell me which transform matrix (prop 133 in XI) I have to > > fwiw, the numerical value may be different on each machine (even on each > startup), it purely depends on how many other properties were created before > this one. only a handful of atoms have real fixed values, they're named > XA_... (XA_ATOM, XA_CARDINAL, etc.) > > > choose so that my touchscreen lines up with my 90 ccw rotated display? > > I've tried practically everything I found sensible but I got absolutly > > no useful results. In fact I get a jumping and flickering cursor, which > > also maps differently based upon which direction I move in. > > the rotation matrix is defined as > > [ cos -sin 0 ] > [ sin cos 0 ] > [ 00 1 ] > > so for a 90 degree rotation you'd use 0 -1 0 1 0 0 0 0 1. However, it's > important to remember you're rotating around the origin, so if you do rotate > you need to offset too, so the above example actually becomes. > > [ 0 -1 1 ] > [ 1 0 0 ] > [ 0 0 1 ] > > The offset is the important bit, forget about it and you get the cursor > stuck in corners or edges. I had the same thoughts and came to the same conclusion, the same matrix. But I get a randomly jumping cursor then. I thought that maybe, the device (that touchscreen, again) happend to export two event devices of which I had then only rotated one, but that isn't the case. Floating the one device I tried to rotate disables it, completey. Even if the matrix were wrong, which I tink it isn't, after you just confimed it, why would the cursor jump arround like crazy? regards, Cedric ___ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
Re: XInput transform matrix
On Wed, Jun 13, 2012 at 05:46:19PM +0200, Cedric Sodhi wrote: > Can anyone tell me which transform matrix (prop 133 in XI) I have to fwiw, the numerical value may be different on each machine (even on each startup), it purely depends on how many other properties were created before this one. only a handful of atoms have real fixed values, they're named XA_... (XA_ATOM, XA_CARDINAL, etc.) > choose so that my touchscreen lines up with my 90 ccw rotated display? > I've tried practically everything I found sensible but I got absolutly > no useful results. In fact I get a jumping and flickering cursor, which > also maps differently based upon which direction I move in. the rotation matrix is defined as [ cos -sin 0 ] [ sin cos 0 ] [ 00 1 ] so for a 90 degree rotation you'd use 0 -1 0 1 0 0 0 0 1. However, it's important to remember you're rotating around the origin, so if you do rotate you need to offset too, so the above example actually becomes. [ 0 -1 1 ] [ 1 0 0 ] [ 0 0 1 ] The offset is the important bit, forget about it and you get the cursor stuck in corners or edges. Cheers, Peter ___ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
XInput transform matrix
Can anyone tell me which transform matrix (prop 133 in XI) I have to choose so that my touchscreen lines up with my 90 ccw rotated display? I've tried practically everything I found sensible but I got absolutly no useful results. In fact I get a jumping and flickering cursor, which also maps differently based upon which direction I move in. Could you help? Thank you ___ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
