Re: Zoom GUI in fltk backend

[John Swensen]

On Jun 29, 2009, at 5:16 PM, Søren Hauberg wrote:

> Hi All
>
> Since Michael implemented text rendering in the fltk backend I've been
> trying to use it for basic plotting. After a while I came to the
> conclusion that I found the zooming interface quite confusing -- I
> actually had to read the code figure out how to work with it. So, I've
> been playing a bit with an alternative user interface (patch  
> attached).
> With this, you zoom using the mouse scroll wheel, and dragging moves  
> the
> center of the plot. I find this much more intuitive, but that might  
> just
> be because my mind works in weird ways...

I think this is the best way to do it also.  I have always been  
frustrated with Matlab's zoom and rotate functionality.  In fact, I  
would prefer that it acts more like a CAD tool in that a center of  
rotation is selected and rotation occurs about that point and zooming  
occurs.  In the GTK plotting window that Michael Goffioul and I have  
worked on, it is implemented in a similar manner.  You can zoom either  
by clicking, dragging a box, using the scroll wheel, or with the  
keyboard.

John Swensen