Re: [Scigraphica-devel] Cairo backend of GtkPlot

[Adrian E. F. <afe...@ki...>]

Hi Dov,

First, I guess the best would be for you to create a CVS branch, maybe 
"gtkextra-3".

All the changes you are suggesting make a lot of sense to me, and I 
think would make gtkplot more versatile and powerful.
I wouldn't like to break to backward compatibility, we have to figure 
out a way to avoid doing it, especially with the markup and fonts. I 
guess the best way to deal with both these problems is by adding a field 
"markup_format" to GtkPlotText. It would make sense for it to be a 
string, so can be expanded in the future to "XMGR"/"OldSG" (pretty much 
the actual format),"Pango","TeX",etc. The Font problem would be fixed 
automatically by checking what format you are using. If you are using 
"XMGR"/"OldSG", you use the old fontmap, otherwise, you use the 
corresponding one.

I love the idea of using SVGs for the symbols. The old ones should be 
supplied by default, though.

I don't understand why you want to get rid of the canvas, IMHO it's what 
makes GtkPlot so user firendly at the GUI level.

Best,
<ADRIAN>

Dov Grobgeld wrote:

> Hi Adrian,
>
> Thanks for the encouragement. I needed that to keep going. :-)
>
> I've put up a page showing my current progress:
>
>    
> http://imagic.weizmann.ac.il/~dov/freesw/gtk/gtk+extra-cairo/index.html
>
> I'm a bit weary of how to continue as I would like to make some big
> changes, that are breaking backwards compatibility. They are:
>
> 1. Replace gtk's current markup language with PangoMarkup.
> 2. Replace the current font mechanism with fontconfig fonts.
> 3. Replace symbols with static svg files.
>
> What do you think Adrian?
>
> Other things that need to be done:
>
> * Get rid of the postcript backend and simply use the cairo backend
> with proper initialization.
> * Get rid of gtkplotcanvas alltogether.
> * Add arrows to the axes. :-)
> * Support pdf and svg output.
> * Allow drawing on user provided cairo surface. Perhaps then we don't
> need to provide save functions at all.
>
> I'd like to putback my work in progress as a backup. Should I create a
> cvs branch?
>
> Regards,
> Dov
>
> On 7/17/06, Adrian E. Feiguin <afe...@ki...> wrote:
>
>> That's great Dov, thanks for taking care of the port!
>> I guess this would also make gtkplotps obsolete.
>> Keep us posted with your progress.
>> Saludos,
>> <ADRIAN>
>>
>> Dov Grobgeld wrote:
>>
>> >Hello,
>> >
>> >I thought the following comment that I added to the feature request 
>> 1382216 [1],
>> >might be of interest to the mailing list:
>> >
>> >I finally started working on this. So far I have created a
>> >new implementation of the GtkPlotPC interface called
>> >GtkPlotCairo, that draws through the cairo backend. I have
>> >implemented most backend functions, except the text and the
>> >image drawing. Meanwhile I have not modified the GtkPlotPC
>> >interface.
>> >
>> >Further I have replaced the instantiation of a GtkPlotGdk
>> >object with the GtkPlotCairo class. The software compiles,
>> >but still nothing is drawn in the GdkWindow. I still have
>> >some debugging to see why that is happening.
>> >
>> >Once I get this to work my plans are:
>> >
>> >1. Change the API of GtkPlotPC to get rid of all the Gdk
>> >structures in the interface, and replace these with cairo
>> >structures.
>> >
>> >2. Get rid of GtkPlotPC alltogether and work directly with
>> >cairo. Possibly I will create some utility functions to make
>> >the conversion from the current to API to cairo smoother.
>> >
>> >Regards,
>> >Dov
>> >
>> >[1] http://tinyurl.com/olanb
>> >(http://sourceforge.net/tracker/index.php?func=detail&aid=1382216&group_id=11638&atid=361638) 
>>
>> >
>> >
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>>