Re: Oplot a backend for Octave

[Ole Jacob Hagen]

Michael D. Godfrey wrote:
> 
> On 01/07/2010 06:57 AM, Ole Jacob Hagen wrote:
>> Why does print.m use gnuplot related commands? This means that gnuplot is
>> mandatory as a installation during file generation with print.m!
>> Shouldn't
>> the backend fix the printing functionality?
>> Shouldn't gnuplot just be a backend, and not the primary application for
>> file generation of figures?
>>    
> This is not accurate.  gnuplot is a backend, See the backend command.
> While there are gnuplot commands in print.m, this is due to history and 
> gnuplot is
> not required.  For example, on my Mac I have not yet implemented gnuplot 
> but fltk
> is fully functional.  It has been remarked before that print.m is due 
> for improvement
> in order to cleanly separate backends.
> 
> You should look at the fltk backend and see how your code relates to it 
> and where
> you can contribute to enhancing the current capabilities.
> 
> Michael
> 
> 
> 

When I tried the following with Octave without having gnuplot installed : 
>> backend("oplot"); plot(randn(1,100)); print -dpng test.png
I then got a message saying that I needed gnuplot to be able to create
test.png. 
But that must be wrong...No file was generated though.....

I haven't looked at the code at a detailed level, so some information might
not have reached my eyes....;-) 

Qt4 is quite large, and the signal-slot mechanism in Qt would be challenging
to be implemented in internal octave, I think. Therefore I use CMake
building system, and not the ancient automake tools. 

Oplot is using opengl_renderer, the same OpenGL renderer as FLTK uses. Using
QSvgGenerator, I hope to to generate SVG files from oplot gui. ;-) 

Version: 
Oplot is GPL'ed yes. 

I need to check out code from repository, since I'm using the 3.3.50
release. ;-) 
Then I can study both the image rendering and gl2ps interface. ;-) 


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