Re: Zoom GUI in fltk backend

[Shai Ayal]

On Tue, Jun 30, 2009 at 7:19 AM, John Swensen<address@hidden> wrote:
>
> 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...
>>
>> Anyway, I'm attaching a patch in case anybody wants to try this out. I
>> had to hardcode the upper and lower bounds for the plot because I
>> couldn't figure out how to extract this information from the axes. So,
>> if you want to play with this, make sure that
>>
>>  min (x) = 0   and   max (x) = 10
>>
>> and likewise for y. I've been playing with the following plot:
>>
>>  x = linspace (0, 10, 100);
>>  plot (x, 5*sin (x) + 5);
>>
>> Comments?
>>
>> Søren
>>
>> <ui.patch>
>
> As a side note, if I submit a patch to allow conditional compilation of a
> GTK+OpenGL backend would that be accepted?  I would make the configure tests
> require explicit inclusion of this backend, rather than just checking for
> GTK+/GTKMM.  Michael Goffioul did most of the initial work, then I added
> functionality, then he cleaned it up quite a bit more.  It is really in a
> quite usable state if all you care about is zooming and rotating.

I don't see why not. The whole backend/frontend concept was conjured
up to allow easy additions of backends ...

SHai