On 04/24/2014 02:16 PM, romanoc...@rgtti.com wrote:
> On 2014-04-24 15:59, Denis Auroux wrote:
>
>> Options -> Pencil cursor?
>> (this doesn't change colors but at least it's bigger and remains
>> visible even when you decide to draw in white).
>
> Could not find it... see screenshot below. Am I blind?

It was added in the repository in November 2012, so it's more recent 
than the standard 0.4.7 release.

> Yes --- the problem I think that these are "fake" points, when the focus
> change. If you see in the image, the dot is way to perfect to be real.
> It happens almost randomly, but what happens seems to be that the focus
> change triggers the last cursor position to a dot. Happens too when
> putting the pen up-side-down to erase and back to draw, sometime.

Then I think the problem is with the driver for your pen device -- it 
seems to send spurious clicks.
Hard to diagnose more precisely without debug output from the input 
subsystem (#define INPUT_DEBUG in src/xournal.h) for the events that 
lead to those "fake" points.

Just in case, try changing the value of discard_corepointer to true in 
the [general] section of .xournal/config (and also set 
ignore_other_devices to true if not already the case). This might help 
remove one of the possible causes of such events, but I am dubious. If 
the dot is not where the cursor currently is then it means a faulty 
device driver is sending a click at a location where it no longer is. 
Let me guess... it's not a wacom tablet, is it? (Mind you, the drivers 
used to all be equally buggy, but by now the wacom driver has mostly 
been fixed, unlike the others...)

> Would you like to see the .xoj file?

It won't be of any use -- it only records the strokes, not the details 
of which input devices claimed to send what sequence of events. The 
portion of the input debug messages corresponding to when you cause such 
a fake dot to appear would be more useful. There's not necessarily much 
I can do, though, unless the pen sends events in a way that's broken but 
not so broken that fixing it would still be possible and make sense as a 
default behavior.

Denis

-- 
Denis Auroux                             aur...@math.berkeley.edu
University of California, Berkeley       Tel: 510-642-4367
Department of Mathematics                Fax: 510-642-8204
817 Evans Hall # 3840
Berkeley, CA 94720-3840

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