Re: Printing lines, shapes and pixmaps from a gnome canvas

[Jean Bréfort <jbrefort wanadoo fr>]

Tambet Ingo wrote:

> On Tue, 2003-01-21 at 13:01, Michael Meeks wrote:
>
> > /Hi Jean,
> >
> > On Sat, 2003-01-18 at 14:38, Jean Br�rt wrote:
> > > I am currently working on adding a print function to the Gnome Canvas,
> > > so that when a canvas has been filled, a simple call to
> > > gnome_canvas_print(canvas, pc) will print it (it must fit on one page).
> >
> > 	Sounds like this is a great idea. I tend to think though, that it's/
>
> >From gnome-print FAQ (from Lauris, 
> http://lists.ximian.com/archives/public/gnome-print/2001-May/000632.html):
>
> It would be cool to have printing interface on canvas items!
>
> It is not so cool at all. In model-view-controller context both
> current gnome-canvas and gnome-print-context implement single
> view. Adding subview (printing interface) to existing view (canvas) is
> not very good idea.
> What would be cool is either:
> - Make generic graphic object class, that can render to different
>  views (canvas and gnome-print)
> - Make model-view based canvas, so objects are clearly distinct from
>  display (and you can have multiple views of same object)
I am not sure I fully understand exactly what you mean. My english is 
not very fluent and I am not an expert programmer either.
Canvas items can render themselves in anti-aliased and nonanti-aliased 
canvas with different functions. I do not see why they should not be 
able to print themselves.
I could even print a canvas without rendering it on screen with the 
following actions:
- create a canvas
- fill it with some items
- call:     while(gtk_events_pending()) gtk_main_iteration(); so that 
the canvas is updated
- print the result.
It works.

I agree that a model-view based canvas would be great but it would need 
much more work than I can do.

Best regards,
Jean