Message-ID: <452EC8E8.5080903 at rftp.com>
Date: Thu, 12 Oct 2006 15:59:52 -0700
From: Robert Roessler <robertr at rftp.com>
Organization: Robert's High-performance Software
MIME-Version: 1.0
To: LablGTK List <lablgtk at math.nagoya-u.ac.jp>
Subject: Re: How to modify the Gdk.gc of a GDraw.pixmap ?
References: <452EBA91.9000704 at tin.it>
In-Reply-To: <452EBA91.9000704 at tin.it>
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Stalkern 2 wrote:
> I'm in trouble when trying to draw dotted lines and the like.
> 
> I have a GDraw.pixmap and I would like to use the function
> 
> 	Gdk.GC.set_dashes : Gdk.gc -> offset:int -> int list -> unit
> 
> on it.
> 
> But how do I access the Gdk.gc of a GDraw.pixmap _directly_?
> 
> Shall I create a new GC and then... ?
> 
> I feel like there is something that in spite of my copy of ocamlbrowser,
> I can't browse very clearly yet ;-))
> 
> Thx for _any_ hint!

I would say to do a GC.create call supplying the drawable (pixmap in 
this case) that you want to work with.

Also, if it helps, a pixmap does not "have" a gc in the sense of 
owning one - you create a gc with an exemplar pixmap for the purpose 
of [for example] drawing into that pixmap - or others like it.

Finally, note that set_dashes is just setting an attribute (a "value" 
in Gdk-land)... you will need to supply that gc along with a 
compatible drawable to a "draw" function to actually get your dotted 
lines.

Robert Roessler
robertr@rftp.com
http://www.rftp.com