GTK+ problems using functions I used in Motif before

[Ignacio Nodal <inodal teleline es>]

Hi,

I'm experimenting some problems with events on my GtkGlArea.

The problem occurs when I pressed my mouse button and released it very 
fast, moving the mouse around ONLY THE FIRST TIME. This made me think 
about initilization problems, but it doesn't seem to be the point.

Let's see:

-First of all, I have a UpdateRotation() function which uses the initial 
mouse position (button pressed) and the current mouse position (get by 
motion or released) to update my objetct in the scene.

-I have one callback for the "button_press_event" where I get the 
initial mouse position and my initial rotation matrix.

-Another one for the "motion_notify_event" where I call UpdateRotation() 
and update my rotation matrix in function of the initial rotation matrix 
get from the previous callback.

-And the last one for "button_released_event" where I only call 
UpdateRotation.

The problem is:
when I press and relase the button to fast moving the mouse from it's 
initial position, I don't understand why, but the function which returns 
me my rotation matrix, sends me a matrix full of zeros (the first time, 
it should return the identity matrix).

This doesn't happen if I don't move the mouse around. It doesn't happen 
neither if I repeat the same operation after rotating the object 
correctly for the first time...

If I "g_print" the rotation matrix when I paint the scene at the 
beginning of my application, it seems to be ok (identity matrix).

But if I "g_print" it again in my "button_press_event" callback, it 
seems to be full of zeros (when using the mouse as mentined above).

I have solve the problem calling the function which get the initial 
rotation matrix in my InitGL() function, which I used at the beginning 
of my program... but I don't really understand why didn't it work before..


In fact.. I'm using the same functions I used in Motif before, and they 
worked pretty fine with Motif.


What it's happening? Does it have something to do with GTK+ or am I just 
getting more and more crazy?

Thanks in advance,
  Ignacio Nodal