Re: Zoom GUI in fltk backend

[Shai Ayal]

On Tue, Jul 21, 2009 at 5:05 PM, Søren Hauberg<address@hidden> wrote:
> tir, 21 07 2009 kl. 06:54 -0400, skrev Ben Abbott:
>> On Jul 20, 2009, at 11:58 PM, Shai Ayal wrote:
>>
>> > On Tue, Jul 21, 2009 at 6:53 AM, John W. Eaton<address@hidden> wrote:
>> >> On 21-Jul-2009, Shai Ayal wrote:
>> >>
>> >> | It's not clear to me exactly what you tried, but panning is done by
>> >> | dragging the mouse, zooming by using the mouse scroll wheel.
>> >>
>> >> Ah.  Duh.  I didn't think to try the scroll wheel.  What if I didn't
>> >> have one?  I was expecting to be able to draw a rectangle and have
>> >> the
>> >> plot zoom to that region.  Would it be hard to implement something
>> >> like that?
>>
>> In fact, my notebook (notebooks in general?) doesn't have a scroll
>> wheel. However, I do like using the scroll wheel to zoom when I have
>> one.
>
> <off-topic>
> I think most notebooks support some sort of wheel emulation. If I hold
> down the middle while moving my trackpoint I get wheel emulation. Most
> Touchpads also support wheel emulation by moving your finger around the
> right-most edge of the pad.
> </off-topic>
>
>> > This was the previous behavior. I can make it user-definable but I
>> > think we don't have a mechanism for setting backend specific settings,
>> > so we'll have to agree on something before I can proceed.
>>
>> Would it not be possible to support both a scroll wheel and click-drag-
>> release?
>
> I think we should a toolbar with a 'zoom' button. When this is clicked
> you should be able to zoom by clicking on the plot. This is what Matlab
> does. But we could still allow for zooming using the wheel, which I
> think is just wonderful.
>
>> Also, how does one unzoom? ... double-click doesn't work for me (which
>> is how I'd do it in Matlab).
>
> I think unzooming on double-clicks would be sensible.
>
>> >>  ca=VALUE
>> >>
>> >> to be printed in the command window.  This looks like handle for the
>> >> current axes object.  Is that just some debugging output?
>> >
>> > Yes, it's debugging. I'll try to hunt it down.
>
> This is just something that is printed from within 'fltk-backend.cc'. I
> don't know why it's there, but it is trivial to remove.
>
> Søren
>
>

Before I submit a changeset, I'll wait a bit to see if anyone else has
any input on which buttons to use for what.
Anyone have any more suggestions?

Shai