Re: fltk backend fix & mouse wheel scroll factor

[Shai Ayal]

On Mon, Sep 28, 2009 at 11:42 PM, John Swensen <address@hidden> wrote:
>
> On Sep 28, 2009, at 3:45 PM, Shai Ayal wrote:
>
>> On Mon, Sep 28, 2009 at 9:24 PM, John W. Eaton <address@hidden> wrote:
>>>
>>> On 27-Sep-2009, Shai Ayal wrote:
>>>
>>> | The attached changset fixes a bug which did not show the zoom box.
>>> | Also added a function to enable the user to control the zoom factor
>>> | when using mouse wheel zoom.
>>> |
>>> | I think that with this changeset, the fltk_backend is quite usable as
>>> | a viewer to the gl-renderer.
>>>
>>> I applied it.  Zooming seems to work well for me now with either the
>>> scroll wheel or the click and drag method.
>>>
>>> | I am open to feature requests.
>>>
>>> Just about zooming/rotating issues, or other things?  :-)
>>>
>>> If we just had images working, then the fltk backend might be able to
>>> run all the demos...
>>
>> My problem right now is that I have only very short timeslots (~1
>> hour) for this, so I try to do small simple stuff. I'll have a look at
>> the image code (probably copy from jhandles as usual..) and see if it
>> fits the timeslot.
>>
>> Shai
>>
>
> Is implementing the images in the gl renderer and harder than making a
> texture with the image on it as a very small negative z-depth, so that
> things plotted on top of it show up?  If that is the case, then I may be
> able to take look at this.

That should do the trick, and there is even a texture helper class
already in gl-render.cc
However there might be a complication if the image is large (10
megapixel images are not uncommon) - I am not sure but there will be
limits to texture sizes. Maybe using a gl bitmap might be better? I
have not studied this yet, so I'm unsure

Shai