Re: [gtk-list] how to instantly drawing

[RNG <r gasch chello nl>]

Hi, 

the behaviour you report makes sense. Since you're calling 
sleep(), your process really is sleeping, thus also not drawing 
the line you just drew ... you probably want to use a timeout 
callback for this, as this will return control to gtk ... your function 
could look like this

int	status = 0;
int mydraw ()
{
	if (status == 0)
		drawline (red, ...)
	if (status == 1)
		drawline (green, ...)
	status ++;
	return 0;
}

If you call this function through a timeout callback, it should work ...

Greetings
--> R

On Tue, 21 Dec 1999, Jiang XU wrote:
> I try to paint on the GtkWidget->window .
> For example, I have a GtkWindow called "mainwindow", I try to draw on
> its GdkWindow that is mainwindow->window.
> I try to draw a red line, then after 1 second I will draw a green line
> at the same place.
> 
> so the code will be look like:
> 
> drawline(red, mainwindow->window,...);
> sleep(1);
> drawline(green, mainwindow->window,..);
> 
> But what happened is: each time it only shows up the green line, never
> see the red line, even didnot see the screen reflesh.
> 
> I know I can put the code in the configure event call back function of
> the mainwindow.  But I donot want to reflesh the whole screen, so I
> didn't send out the configure_event signal .
> 
> I wonder whether there is a way to instantly draw on the GdkWIndow
> (which is GtkWidget->window), and show on the screen immediately!!
> 
> I  appreciate any Help! If someone knows, Please teach me ASAP,
> 
> Thanks very much
> 
> Jiang
> 
> -- 
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