Delivered-To: lablgtk at yquem.inria.fr
Message-ID: <47A39F6C.2060605 at rice.edu>
Date: Fri, 01 Feb 2008 16:38:36 -0600
From: Gregory Malecha <gmalecha at rice.edu>
MIME-Version: 1.0
To: Jacques Garrigue <garrigue at math.nagoya-u.ac.jp>
Subject: Re: [Lablgtk] GnomeCanvas Enumerate Items
References: <20080105.170933.98869039.garrigue at math.nagoya-u.ac.jp>	<47A01A5D.8030706 at rice.edu>
	<20080130.161111.48533977.garrigue@math.nagoya-u.ac.jp>
In-Reply-To: <20080130.161111.48533977.garrigue at math.nagoya-u.ac.jp>
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Thanks for the help.

Now I've come upon another problem. I'm failing to see how I'm suppose 
to get the properties of something like this. For example, I have a 
polygon and I want to iterate through the points or get the background 
color.

Thanks.

Jacques Garrigue wrote:
> From: Gregory Malecha <gmalecha@rice.edu>
>   
>> I was able to get most of this working using wrap_item. There are a few 
>> cases that it apparently doesn't handle though. Mainly group, text, 
>> rich_text, etc, the ones that aren't GnoCanvas.items. Here's the code 
>> that I have:
>>
>> type annotated_item =
>>     Group of GnomeCanvas.group_p GnoCanvas.item (* I'd like this to be 
>> GnoCanvas.group *)
>>     
> [...]
>   
>>   else if GnomeCanvas.Types.is_a item GnomeCanvas.Types.group then
>>     let gp = GnoCanvas.wrap_item item GnomeCanvas.Types.group in
>>     Group gp
>>     
> [..]
>   
>> Does anyone know of a way to get a GnoCanvas.group rather than a 
>> GnomeCanvas.group_p GnoCanvas.item when performing the cast?
>>     
>
> Since you have already checked that it has the right type, you can use
> Gobject.unsafe_cast.
>
>    new GnomeCanvas.group (Gobject.unsafe_cast item)
>
> Looks safe enough to me.
>
> Jacques
> ---------------------------------------------------------------------------
> Jacques Garrigue      Nagoya University     garrigue at math.nagoya-u.ac.jp
> 		   <A HREF=http://www.math.nagoya-u.ac.jp/~garrigue/>JG</A>
>
>   

-- 
gregory malecha
wiess college
computer science
219.510.3400

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