ps, i know my donation is pretty insignificant, but to me it’s as if i’m paying for this app. thanks for making it free and open source
X,y max seems to be about 32000, not 65535 as described
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See the test script https://bitbucket.org/techtonik/discovery/src/tip/graphics/gfxtablet/?at=default
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You’re right, the maximum is 2^15-1, see CanvasView normalizeX/Y L103 referencing Short.MAX_VALUE.
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What about the pressure value? I can’t relate it to the values in GIMP’s input device settings.
The raw values seem to go from ~1200 (min) to ~4800 (max).
And in GIMP it looks like it’s divided by 10, but not really.Which makes it really hard to find the right curve to get 100% opacity when pressing on the screen as hard as possible.
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What about the pressure value?
Android: »A normalized value that describes the pressure applied to the device by a finger or other tool. The pressure generally ranges from 0 (no pressure at all) to 1 (normal pressure), although values higher than 1 may be generated depending on the calibration of the input device.« [https://developer.android.com/reference/android/view/MotionEvent.PointerCoords.html#pressure]
The GfxTablet app maps [0…2] to [0…65535] so that 32768 means 1.0 in Android pressure.
The uevent driver sets 0 and 32768 as the min/max values, so that an original Android value of 1.0 corresponds to the max value of the uevent pressure.