hi, i do much the same thing in my application when i am zooming in on seismological waveforms, mouse-down drag-right = zoom in, mouse-down drag-left = zoom out. in order to determine whether or not to zoom in or out, on mouse-down i save the coordinates of the current mouse position, and then on the drag event compare the new mouse position with the original (saved) mouse-down position. if new > original then zoom in, else zoom out. once the drag event is processed, i reset the original position with the new position (thus, allowing the user to change directions without having to either: 1) restart the mouse event, or 2) get back to the original position. how this is relevant for you would be app-specific). if you want to restore the original starting position, simply save the mouse position on mouse-down and then restore these saved coordinates on mouse-up. hope this helps, richard boaz > Hello all, > > I have implemented a way to rotate the view around a point in my 3D > application, by using the mouse pointer: in > fact when the left mouse button is hold down and the mouse is moved, the > view rotates around. When this process > is going on, the mouse is hidden (i.e. its shape is an empty image). > My problem is that I would like to reset the mouse pointer position > after each delta movement has been detected: in this > way the mouse pointer is always placed in the original position it was > when the mouse button was pressed. I do not know > how to do it, any help? > > TIA > Luca > _______________________________________________ > > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list > _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
