Re: legends in FLTK backend?

[Jaroslav Hajek]

On Mon, Jan 18, 2010 at 4:53 PM, Michael Goffioul
<address@hidden> wrote:
> On Mon, Jan 18, 2010 at 3:34 PM, Jaroslav Hajek <address@hidden> wrote:
>> hi all,
>>
>> I started to play with a multi-objective genetic optimization
>> algorithm in Octave, and used plots to animate the progress of the
>> algorithm. The animation was smooth enough with Gnuplot but still a
>> little snatchy, so I switched to the fltk backend and to my surprise
>> it was much smoother still, without any flickering or blinking. Many
>> thanks for the work! I think I'll try to use fltk more often from now.
>>
>> I noticed that legends still don't work. Is there any way I can help?
>> My OpenGL knowledge is essentially zero, so that probably limits the
>> options.
>> Still, if someone explained to me what needs to be done, perhaps I
>> could be of some use. I tried to search the archives but found nothing
>> useful.
>
> The problem of the missing legend is not really OpenGL related.
> If one succeeds to represent legend as a regular axes object
> containing line and text objects (which is what Matlab does), then
> you'll have legends automatically drawn in the OpenGL backend.
>
> The tricky part is to size and locate things properly, and maybe
> add some dynamism to be sure that the legend object stays properly
> located if the target axes object is moved around.
>
> But basically, the entire implementation has to happen in the front-end.
>
> Michael.
>

Thanks, John, Michael.
I suppose the first thing to start with is determining the text
extents. Any suggestions?

-- 
RNDr. Jaroslav Hajek, PhD
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz