[Gambas-user] Reading pen pressure from wacom tablets

[Ricardo Díaz Martín]

Benoit,

Ummm, take an oulook to this: http://doc.trolltech.com/4.6/qtabletevent.html

this is the event definition:
QTabletEvent::QTabletEvent ( Type type, const QPoint & pos, const QPoint &
globalPos, const QPointF & hiResGlobalPos, int device, int pointerType,
qreal pressure, int xTilt, int yTilt, qreal tangentialPressure, qreal
rotation, int z, Qt::KeyboardModifiers keyState, qint64 uniqueID )

there is a "keyState specifies which keyboard modifiers are pressed (e.g.,
Ctrl)."

Could it be the segment fault for this keyState property?

Regards,
Ricardo

2012/8/16 Ricardo Díaz Martín <oceanosoftlapalma at ...626...>

> Hi Benoit,
>
> When I said using gtk+ components tablet is not detected is because the
> Pointer.Type is 0 (this is the same value you get using qt4 when you use
> the mouse for drawing in the drawing area control).
>
> In using Ubuntu 12.04 gnome 3 so you wacom tablets are plug and play with
> the kernel. You don't need to parch kernel neigther X11 no more (you can
> read this in sourceforge wacom driver for linux).
>
> It's really strange the crash is produced by keyboard event... I didn't
> touch any key 8-)
>
> BTW I have installed qt creator (ubuntu officical repo) and there is an
> "tablet" name example. Everything works in this example. In adition looks
> like xtilt and ytilt are allways 0 with my wacom bamboo pen. Rotation is
> setted to -14.0625 like in gambas3.
>
> Hope that it helps you.
>
> Regards,
> Ricardo Díaz
>
>
>
> 2012/8/16 Benoît Minisini <gambas at ...1...>
>
>> Le 16/08/2012 09:06, Ricardo Díaz Martín a écrit :
>> > Ok, this is the information I got:
>> >
>> > - When I said crash in the IDE too, it means after the crash in the
>> > project, if you still moving the pen in the tablet, the IDE got the
>> crash
>> > with no information (IDE disappear)
>>
>> If the IDE segfaults too, then this crash may be a bug in Qt itself...
>>
>> > - With gtk+ components the tablet is not detected. Tablet is detected as
>> > normal mouse. No crash in the project. No crash in the IDE.
>>
>> How do you know that the tablet is not detected? Did you any X11 stuff
>> to configure your tablet?
>>
>> > - The event Move, Down, Up are right fired. Work as expected with the
>> pen
>> > and with the mouse.
>> > - If you set Tracking property to true in the drawing area control you
>> you
>> > got the MouseDown event and MouseUp event some times is fired and some
>> > times no.
>>
>> Mmm...
>>
>> > - I got the same crash by compiling gambas with no qt4 optimizations
>> >
>> > gdb with gambas3 qt4 no optimizations compiled was:
>> > Starting program: /usr/local/bin/gbx3
>> > [Depuración de hilo usando libthread_db enabled]
>> > Using host libthread_db library
>> "/lib/x86_64-linux-gnu/libthread_db.so.1".
>> > [Nuevo Thread 0x7fffea237700 (LWP 20134)]
>> > [Nuevo Thread 0x7fffe9a36700 (LWP 20135)]
>> > [Nuevo Thread 0x7fffe37c4700 (LWP 20136)]
>> >
>> > Program received signal SIGSEGV, Segmentation fault.
>> > QBasicAtomicInt::ref (this=0x18700000131) at
>> > /usr/include/qt4/QtCore/qatomic_x86_64.h:121
>> > 121                 : "memory");
>> >
>> >
>> > gdb backtrace was:
>> > #0  QBasicAtomicInt::ref (this=0x18700000131) at
>> > /usr/include/qt4/QtCore/qatomic_x86_64.h:121
>> > #1  0x00007ffff5da1184 in QString (other=..., this=0x7fffffffcd10) at
>> > /usr/include/qt4/QtCore/qstring.h:726
>> > #2  text (this=0x7fffffffd2b0) at /usr/include/qt4/QtGui/qevent.h:236
>> > #3  CWidget::eventFilter (this=0x7ffff60082a0, widget=0x986050,
>> > event=0x7fffffffd2b0) at CWidget.cpp:2822
>>
>> ---> That lines means the crash occurs while receiving a *keyboard*
>> event. Does it make any sense to receive a keyboard event while using a
>> pen?
>>
>> We must find other Gambas users having a tablet to help us!
>>
>> --
>> Benoît Minisini
>>
>>
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