On Fri, 2014-08-29 at 16:58 -0500, richard boaz wrote: > you can find a discussion and one possible solution of this in a previous > thread: > > https://mail.gnome.org/archives/gtk-list/2011-July/msg00059.html I think unfortunately the solution is not that easy... I have a similar problem with my CAD tool (http://www.ssalewski.de/PetEd.html.en) -- for fast object movements moving is not as smooth as it could be. First I thought that simple my drawing speed is still too slow, but after some optimizations that is not the problem any more. Indeed it is not a big problem for me, and I was busy with other tasks, so I have not spent time investigating it. But I found same reports of other people with similar or related problems (http://stackoverflow.com/questions/16359775/gtk-motion-notify-event-is-hint-always-true) As the author of this question did not provided a minimal test, I just hacked together this code below. Well it is Ruby, but I would be surprised if result is much better for plain C. When I move the mouse pointer fast from left to right, I get the output below, with large gaps in x coordinate. So I guess that the rate of motion notify events is indeed low. (I know that there is a POINTER_MOTION_HINT_MASK available, to suppress too high rates, but that should not help...) My feeling is, that the maximum event rate is hard coded in GDK library, I think I read that years ago. Would be not really nice... stefan@AMD64X2 ~ $ ruby test.rb 4 481 20 481 37 481 57 481 70 481 87 483 104 483 120 483 140 483 160 483 181 483 207 481 226 481 require 'gtk3' window = Gtk::Window.new window.set_default_size(800, 800) window.signal_connect("destroy") {Gtk.main_quit} window.add_events(Gdk::Event::Mask::POINTER_MOTION_MASK) window.signal_connect("motion_notify-event") {|w, e| print e.x.round, " ", e.y.round, "\n" } window.show_all Gtk.main > > On Fri, Aug 29, 2014 at 4:29 PM, ax487 <ax487@xxxxxx> wrote: > > > Hello all, > > > > I am wondering about the rate at which pointer motion events are > > generated. In my application I draw strokes on a canvas. I noticed that > > if I move the pointer at a high velocity the strokes no longer appear as > > smooth as for slower pointer motions. The time between motion events (>= > > 10ms) seems to be inadequate to capture the motion correctly. Is there > > anyway to increase the time accuracy? _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list
