Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!infonode!jon
From: jon@infonode.ingr.com (Jon Stone)
Newsgroups: comp.windows.x
Subject: Re: Help! What is the magic of the sleep() statement?
Message-ID: <1991Jan9.222321.13732@infonode.ingr.com>
Date: 9 Jan 91 22:23:21 GMT
References: <1991Jan9.150326.6248@warwick.ac.uk>
Reply-To: jon@ingr.com
Organization: Intergraph Corp. Huntsville, AL
Lines: 32

In article <1991Jan9.150326.6248@warwick.ac.uk> csuyk@warwick.ac.uk (FUNG Wai Wa) writes:
>The following few statements attempt to create a window and draw a line
>with some strings. I found that the sleep(1) statement is very crucial
>for its success. Its presence can make the program work as I expect but
>its absence make the program map the windows only. No drawing at all, if
>I run this program from another machine. Occasionally I can get it running
>in the same workstation where I started X.

I'm no x-spert, but I think you need to wait for an Expose event before
doing any drawing.  X automagically queues up an Expose event when you
map your window.  This code is far from perfect.  Try reading Chapter 3
of the Xlib Programming Manual.  It should fill you in on the details.

Try something like this:

	all your init stuff.
	XMapRaised
	XSelectInput (dpy, win, ExposureMask);

	while (1) {
		XNextEvent (dpy, &event);

		if (event.type == Expose)
			draw
	}

  Jon
-- 
_______________________________________________________________________________
Jon D. Stone				jon@ingr.com -or- ..!uunet!ingr!jon
Intergraph Corporation, Huntsville, AL	(205)730-8594
_______________________________________________________________________________