Re: [DiaCanvas] Dashing feature of DiaCanvasLine

[Arjan M. <ar...@no...>]

On Tue, 2003-10-28 at 12:08, Martin Willemoes Hansen wrote:
> On Thu, 2003-10-23 at 16:45, Arjan Molenaar wrote:
> 
> > > > You can also create it as a macro with the same syntax.
> > > Uh I realy dont like macro's, 
> > > functions are much easier for me to work with.
> > 
> > I though so. ;-)
> 
> Also elipsis parameters (...) are kind of bad when working with c#
> wrapping.
> To work with elipsis, I need to make glue code for each function
> signature. Fx. the dia_dash_style_new .. I have two functions:
> 
> diasharp_create_dia_dash_style_one (gdouble dash);
> diasharp_create_dia_dash_style_two (gdouble dash1, gdouble dash2);
> 
> Unfortunately Mono does not marshall arrays, so I still have the problem
> of using DashStyle :(
> 
> How can we solve the issue? I can think of two things:
> 
> 1. Make DashStyle not use an array, like having just fields, and make
> the creator function initialize thoes. Or have some kind of wrapper
> frindly object like a glist. Maybe a garray, unfortunately garray is not
> implemented in gtk#, maybe it has something to do with the array
> marshalling stuff which does not work in mono.

It's really a bummer C# can't handle any number of arguments for it's
functions. Python can and it's a really neat feature.

> 2. Make DashStyle a full fledge gobject.

Not really an option I think...

> How much work will be involed in this solution?

3. Create some sort of builder-function:
dia_dash_style_add_segment(dash_style, gdouble segment) (returns the
same DiaDashStyle).

In C# you can do something like this:
 dash = new DiaDashStyle().add_dash(7).add_dash(10).add_dash(5) etc.

How does C# handle GValue's then?

I've had a request before for making line-creation functions like
gnomecanvas does (with _add_segment() functions).

You can always create some C# glue function for this, but I think it's
worth implementing in C too, especially for bezier curves (and lines in
general). It's less C-ish to do the same thing for DiaDashStyle, but for
the sake of wrappieness I don't think it will hurt (It's not needed for
Python, since python can take any number of arguments for it's functions
:-).

Regards,

Arjan