[rrd-users] Need help with a CDEF/AREA setup

Paul Rimmer paul.rimmer at gmail.com
Fri Oct 26 23:13:45 CEST 2007


I've been using rrdtool to graph temps around my house for a couple of
months now.  I setup a CDEF that shows night vs. day based on sunrise and
sunset temps.  Its been working great however now that the below zero have
arrived, I notice that the AREA does not cross the x-axis.

You can see what I mean here:


The script I use to generate the graphs is here:


The line that defines the CDEF used for night is:


Any idea how I can change this so that the night AREA covers both sides of
the x-axis?

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