Re: reference to drawn objects

[Lars Clausen <lars raeder dk>]

On Mon, 2005-08-15 at 02:11 +0200, Steven De Groote wrote:
> hi,
>
> I am a student in computer science and I'm currently working on a 
> project that involves graph drawing.
> As some of you are probably quite experienced with drawing software I 
> would like to know how you keep track of objects that are drawn on the 
> canvas.
>
> I am drawing several things such as splines, however as the user clicks 
> I must be able to know which object he marked, but I'm stuck there..
> Do you have any advice on how to keep track what object is where? How is 
> that done in DIA?

When an object is selected. the application calls the SelectFunc on that
object.  Also, you could call object_is_selected to check if an object
is selected or not (somewhat expensive operation) or
diagram_get_sorted_selected().  This is better documented in current
CVS.  When you say "I must be able to know which object [the user]
marked", what piece of code are you running?  

-Lars

-- 
Lars Clausen <lars raeder dk>