[rrd-users] Re: Horizontal line at maximum value

[Alex van den Bogaerdt]

On Tue, Feb 25, 2003 at 01:31:43PM -0300, João Marques Ferreira wrote:
> I would like to add a horizontal line at the MAXIMUM INCOMING VALUE and another one at MAX OUTGOING VALUE in a graph.

[snip]

> I tryed to use HRULE and got no success...  In the above code I tryed to create another line (LINE2) with CDEF:max defined and got no success too... any ideas ?

step 1: Determine the maximum value for incoming and for outgoing
step 2: Use the determined values inside a HRULE

So: At the first stage you use "rrdtool graph" without graphing elements
but with a PRINT (!!!NOT!!! GPRINT!) command.  The resulting numbers are
then available to your script so you can now create the input for a next
"rrdtool graph" command, this time including the normal graphing functions
and your HRULE commands.

Alex
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