Re: GTK scribble example

["Richard Warren" <rew primagraphics co uk>]

> I'm making a small drawing program with GTK, and I'm having an
> issue that's also in the "scribble" example tutorial (using this as
> an example because people would likely know what I'm talking about
> that way). Anyways, the issue that I'm having is that the program
> doesn't receive mouse movement events for every pixel that the
> mouse moves, especially when the mouse moves fast.  So my question
> is, how do I make it receive more mouse movement events, even when
> the mouse is moving fast, or how can I get around such problems in
> a way that's smooth unlike just making lines to the last known
> location of the mouse.

When you enable the events you want from your drawing area, are you 
including the GDK_POINTER_MOTION_HINT_MASK event?  I think the scribble 
example does that, so if you've based it on that you probably are.

If so, I believe that might be why you're not getting all the positions.  An 
explanation can be found at:

   http://developer.gnome.org/doc/API/2.0/gdk/gdk-Events.html#GdkEventMask

Look at the bit about the ...HINT_MASK for details.  Then try not using 
hints, but be aware that your application may lag a bit when the mouse is 
moved quickly.

Hope that helps,
Richard.