Re: why i can't draw the graphic??

[James Henstridge <james daa com au>]

闄 鑳 wrote:

> hi,james
>     After reading the material showed by you,I don't understand why 
> the first time
> drawing can't be viewed?and it is obviously hidden.
>
>   The configure event,i keep it in the code.But only when i hit the 
> window,the
> configure event will happen,and draw the graphic.It make me confused 
> because it
> should happen when the window originally produced.

If you draw on a window before it has been mapped to the screen, then 
nothing will happen.  The way the X drawing model works is that when a 
portion of a window gets displayed, an "expose event" gets sent back to 
the application.  The application responds to the expose event by 
drawing what is supposed to be in that area.

Even if the initial drawing did display, it is probably not what you 
want -- as soon as your window gets hidden and exposed, whatever you 
drew would be gone.

James.

--
Email: james daa com au              | Linux.conf.au 2003 Call for Papers out
WWW:   http://www.daa.com.au/~james/ |   http://conf.linux.org.au/cfp.html