Re: gtkdrawing x gtkpixmap

["Chris Garrett" <garrett91 hotmail com>]

Hi,

I am not sure if this will help because I am just starting out in GTK 
myself, but a gtk_timeout might be what you are looking for regarding the 
lack of dependency on signal callbacks.

Regarding drawing points on a drawing area, the approach I am using for my 
app at the moment, is creating a GdkPixbuf, editing the data pixel-by-pixel, 
and then rendering it to the drawing area on an expose event or when changes 
are made using gdk_pixbuf_render_to_drawable().

I am afraid I have not used the gdk_draw... set of functions myself, but 
they might also be what you are looking for.  They allow you to draw 
'primitives' such as rectangles, lines, etc onto a drawable such as a 
drawing area.

Find out about timeouts here:
http://www.gtk.org/tutorial/ch-timeouts.html

Find out about the drawing functions here:
http://www.gtk.org/tutorial/sec-scribble.html#AEN2945 (uses 
gdk_draw_rectangle)
http://developer.gnome.org/doc/API/2.0/gdk/gdk-Drawing-Primitives.html 
(lists all the drawing primitives etc)

I hope this is of some help.

Chris.


> From: Brandon <bmccombs ma rr com>
> To: Samir Bonho <samir labspot ufsc br>
> CC: gtk <gtk-app-devel-list gnome org>
> Subject: Re: gtkdrawing x gtkpixmap
> Date: Tue, 11 Mar 2003 20:30:13 -0500
>
> I'm glad you asked this question. I've asked similar questions at least
> 2 times and never got any help on it. ALl I want to do is draw points
> onto a drawing area without relying on widget events occurring first
> (ie. not relying on signal callbacks that contain drawing functions) and
> no one seems to want to respond. Maybe you will have better luck.
>
> Samir Bonho wrote:
> >
> > Hi folks ,
> >
> > I read almost everything about GTKDrawing and GTKPixmap. I compiled an
> > example (scribble-simple) to understand this functions.For my life in
> > earth  be peacefull I need to know :
> >
> > What is the biggest difference of a Drawing area and a Pixmap ???
> > I draw stuff in the pixmap or in the drawing area ????
> > For example : I want to draw a point. I set all events that I want. But
> > this events has to belong to a DrawingArea or to the Pixmap ??
> >
> > Thanks for your patience...
> >
> > Samir "the dumbiest man ever" Bonho
> >
> >
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> _______________________________________________
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