Re: [Gimp-gui] Curve-bend plugin as an on-canvas tool

[Jehan <jehan girinstud io>]

Hi,

On 2015-11-02 19:36, Elle Stone wrote:
> On 11/02/2015 10:02 AM, Jehan wrote:
> > Hi,
> >
> > On 2015-11-02 15:02, Elle Stone wrote:
> > > On 11/02/2015 07:41 AM, Alexandre Prokoudine wrote:
> > > > 2 нояб. 2015 г. 15:37 пользователь "Elle Stone" написал:
> > > >
> > > >  > Also, what does "on-canvas" mean?
> > > >
> > > > With old plugins, all interaction happens in a plugin's window. 
> > > > Compare
> > > > it to any tool like brush or crop that works directly on canvas.
> > >
> > > Thanks! that helps to clarify the term.
> >
> > About this specific point, I believe that many of us want more 
> > features
> > going "on-canvas" when possible.
> > In GIMP dev version, the filter are also previewed on-canvas (when
> > implemented as GEGL operations). I already discussed that it would be
> > very cool if import could end up with on-canvas preview as well at 
> > some
> > point (especially useful with lossy formats, etc.). These are only
> > passive canvas interaction, but I could imagine active interaction on
> > the canvas too in the future, and no only for tools. :-)
> >
> > Canvas interaction are often much more intuitive than through a dialog
> > or a dock. And reproducing the image inside the dialog/dock is often
> > more of a workaround than a solution in my opinion (though in some
> > cases, it may have its good points).
>
> Could you give some examples of "on canvas" tools and "not on canvas"
> tools from GIMP 2.9? And maybe an example or two of a tool that is
> currently not on canvas, that would be a good candidate for being "on
> canvas"? I don't think I really understand the difference. Is drawing
> a gradient an "on canvas" tool?

All tools are already on-canvas.

Until now, all filters were *not* on canvas, which was often annoying 
(having to test, cancel, test, cancel; or some filter could have its own 
preview window, more or less useful but in all case less featured than 
the canvas). Now since 2.9, we are able to have on-canvas preview for 
filters (GEGL ops), and we will likely soon have even partial previews 
(like part of the canvas previewing the operation side by side to 
non-filtered image. Mitch has a work-in-progress on the topic). We could 
even imagine have more on-canvas interaction. For instance what if a 
filter requires a rectangle source? Instead of having coordinate fields, 
allowing the user to drag a rectangle with the mouse on the canvas could 
be more intuitive.

That's all what on-canvas mean: allowing to work directly on the main 
canvas.

Jehan