[rrd-users] Re: Base for AREA plots

Alex van den Bogaerdt alex at ergens.op.het.net
Thu Oct 21 10:10:04 MEST 2004

On Thu, Oct 21, 2004 at 02:14:32AM -0500, Christopher Snell wrote:
> I think my solution (posted in another thread) has the same problem: 
> values less than 0 will draw from 0 downwards instead of -20 upwards.
> This RPN is burning my brain--it almost seems like it would be easier
> to patch RRDtool to enable alternate baselines, than to figure out the
> RPN required to do this.  :(

Start with
  DEF:temperature=   ...
and remove any errors I made.

The "CDEF" statement uses "temperature,POP" to get an empty stack
but with a time/resolution component.  Then it pushes the number
-20 on this stack and ends.  This results in a constant of -20.

Next, AREA is used without a color; this results in a transparent
area.  On top of this invisible area, temperature is placed.

You want an answer?  You'd better follow the following guidelines!
Linesize well below 80 chars. Reply to the list, not to me. Trim
irrelevant lines. Reply _below_ the relevant lines, not on top.

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