[rrd-users] displaying graphs which often overlap

Steve Shipway s.shipway at auckland.ac.nz
Mon May 9 02:28:33 CEST 2011

You could plot the lines using different patterns of dashes (so that they show up under each other); or use an alpha channel to make them semi-transparent. 

If your lines are coloured R G and B and you make them dashed as .-.-.-.-, ..--..-- and ....---- with a 0.5 alpha then you'll get a colourful pattern when they overlap :)

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.shipway at auckland.ac.nz
Ph: +64 9 373 7599 ext 86487

From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of Martin T [m4rtntns at gmail.com]
Sent: Monday, 9 May 2011 10:40 a.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] displaying graphs which often overlap

I'm monitoring battery temperatures of three uninterruptible power
supplies. All three are usually 35C- very seldom the temperature
increases or decreases a degree or two for a short period of time. So
as you can imagine, I have three lines overlapped so basically it
looks like I'm monitoring only one device. It's not some sort of
serious problem or something, but I was just wondering, are there some
clever techniques to display/generate graphs in such situations?


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