RE: draw line in gtk

[manu aradhya <manu_aradhya yahoo co in>]

when u set callback to expose event,this callback is
contineously called,which eats cpu time.if set a
pixmap ,it refreshes(expose event is called) only when
somthing  is written on the drawing area.
                                    -manu.

--- Tom Liu <tom liu flextrade com> wrote: > I think
the pixmap will eat more CPU than drawlines.
> > -----Original Message-----
> > From: gtk-app-devel-list-admin gnome org
> [mailto:gtk-app-devel-list-
> > admin gnome org] On Behalf Of manu aradhya
> > Sent: Thursday, May 06, 2004 9:07 AM
> > To: gtk-app-devel-list gnome org
> > Subject: Re: draw line in gtk
> >
> > dont use for the expose event it will take eat
> your
> > system time. better use pixmap to draw. then map
> it to
> > drawing area.see scribble code example.
> >                                -manu
> >
> > --- Peter Krueger <pkrueger appss de> wrote: > On
> Thu,
> > 6 May 2004, Utpal Shasane wrote:
> > > > I drawn line using
> > > gdk_draw_line
> > > >
(draw->window,draw->style->fg_gc[GTK_WIDGET_STATE(draw)],23,20,23,450);
> > > > on drawing area widget. But, it comes once and
> > > vanishes. When i called
> > > > gtk_timeout_add() function it
> > > > is contineous. Can somebody tell me, how i can
> > > draw a line without using
> > > > gtk_timeout_add().
> > > Hi Utpal!
> > > The drawing area widget can't remember your
> drawing
> > > calls, that's why your
> > > line disappears when the drawing area was
> covered by
> > > some other window and
> > > then exposed again. You have to connect the
> > > "expose-event" signal to your
> > > drawing area and then draw your contents from
> the
> > > signal handler.
> > > Drawing outside an expose-event can also be
> > > dangerous, since the
> > > underlying window resources could be invalid
> when
> > > the widget is
> > > currently not shown on the screen.
> > >
> > > Regards,
> > >                      Peter
> > > --
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