On Mon, Dec 21, 2015 at 1:24 PM, Peter Hutterer <peter.hutte...@who-t.net> wrote:
> On Mon, Dec 21, 2015 at 10:12:24AM -0800, Bill Spitzak wrote: > > I find it hard to believe this is what client programs will want. A > > painting program wants the axis of an elongated brush to be perpendicular > > to the tilt will work correctly only if *both* axes are flipped (as your > > code appears to be doing). But it will get "which edge is nearer" > backward > > if it wants to draw something asymmetric in the direction the pen is > > tilted. And it also seems to make little sense to flip the vertical tilt > > for a left-handed user. > > > > Or are you perhaps undoing some flip that the tablet is doing internally? > > a tablet in left-handed mode is effectively rotated by 180 degrees to bring > the set of buttons towards the side of the nondominant hand. this inverts x > and y, if we don't also invert tilt the client program will think that the > pen is tilted in the opposite direction. > > symmetrical tablets don't have a left-handed mode. > > That makes sense. I assume the condition that triggers this is exactly the same as the one that triggers the x and y axis to be inverted, right? You might also need to check whether z-axis rotation is correct (ie is the zero in the right direction).
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