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From: kens@jargon.whoi.EDU (Ken Stewart)
Newsgroups: comp.windows.x
Subject: Re: strip-chart display
Message-ID: <9101041024.AA10729@jargon.whoi.edu>
Date: 4 Jan 91 10:24:17 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 20


> > 	I'm writing a simple strip-chart application ...
 
>   I have helped some of our customers with a similar problem, although they
> didn't use X.  If you maintain a max and a min, and assuming your 
> fluctuations aren't too great, you can bitblt only the part of the window 
> which changes ...

Dave --

	Thanks for the reply; good suggestion. Unless I misunderstood you,
though, it's a bit more complicated to keep track of min/max than a simple
increment/decrement. If the current min or max scrolls off the end, you 
probably have to traverse the list of displayed values to replace it; easy
to do, though, and not a big performance penalty compared with blitting.

	I couldn't get through to the return address on your message, so
I'm posting this reply back to the net.

-Ken