Re: mouse zoom centred on mouse position.

[sfeam (E. Merritt) <eam...@gm...>]

On Wednesday, 20 June 2012, pl...@pi... wrote:
> On 06/20/12 14:27, Tait wrote:
> >> I would propose to revise mouse zooming to comply more with that used in map
> >> >software (maps.google.com, mapy.cz etc.). Thus:
> >> >- mouse wheel zooms around current mouse position (it could zoom around
> >> >   center if mouse is outside graph border)
> >> >- Shift-wheel would move graph up/down (as now without Shift)
> >> >- Ctrl-wheel would move graph left/right (now with Shift)
> 
> > I'm used to  [...]
> > the normal unmodified use of the scrollwheel for vertical and
> > horizontal scrolling
> 
> Are you saying that you are using some commonly used software that has a 
> sufficiently large user-base  that it should be weighed into a 
> discussion on finding some commonality ?
> 
> If so , what is it?

  Every web browser?

FWIW, I think that mouse "button events" 4+5 are in the X11 protocol
as up/down scroll, while button events 6+7 are left/right scroll.
Most mouse wheels send events 4+5, although sometimes you can 
reconfigure this in the mouse driver (or xconfig).  At Mojca's
suggestion, we added 6+7 as left/right scroll recently because it
seems that touch-screen devices use this same set of event codes
to indicate up/down left/right dragging.  I don't so much care 
what convention gnuplot uses for a "real" mouse wheel, but I
think it is important that it is interpreted as left/right up/down
scrolling on a touch screen.

	Ethan