Re: mouse zoom centred on mouse position.

[Petr M. <mi...@ph...>]

> > just a quick idea to throw into the air: I was using cntl-mouse_scroll 
> > to zoom in and out on  a long data series and found myself having to 
> > adjust left and right.
> > 
> > What  some graphics programs (and ggogleearth) do in this situation is 
> > to zoom on the mouse position.  This is a major improvement.
> > 
> > Put the mouse over the point of interest and zoom in and out. The point 
> > of focus under the mouse stays in the same position and the rest scales 
> > and shifts around it.
> 
> There was a preliminary patch submitted that would do this:
>    https://sourceforge.net/tracker/index.php?func=detail&aid=2972660&group_id=2055&atid=302055

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 find the current behaviour counterintuitive and thus actually not using it 
at all :-(

---
Petr