As for the repainting, I don't think I was clear enough in my initial post: my problem isn't how to change the value every 1/100 of a second but how to ensure that the value I write doesn't get hugely inaccurate. I was thinking that I'd use the system time as the data and just draw when appropriate, but I hadn't found something that was precise enough.

I ended up finding System.Posix.Clock, which does what I need, but I don't know if there's something more standard.

On Sun, Jul 25, 2010 at 7:30 PM, Henk-Jan van Tuyl <hjgtuyl@chello.nl> wrote:

On Sat, 24 Jul 2010 22:09:15 +0200, Alex Rozenshteyn <rpglover64@gmail.com> wrote:

I'm trying to write a simple timer application (mostly to learn gui
programming), and I'd like it to display 1/100ths of a second. I know I can
fake this with threadDelay, but I was wondering if there's a way to get
current time to more precision than one second.

That depends on the type of GUI you are using, of course. If you use wxHaskell, you can do it like this:

t <- timer f [ interval := 10
, on command := repaint
]

where f is the frame handle; you don't need to use t anywhere. The interval is defined in milliseconds.

Regards,
Henk-Jan van Tuyl

--
http://Van.Tuyl.eu/
http://members.chello.nl/hjgtuyl/tourdemonad.html
--

--
Alex R