RE: draw line in gtk

["Tom Liu" <tom liu flextrade com>]

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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