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= ... CDEF:minus20=temperature,POP,-20 AREA:minus20 STACK:temperature#color:legend 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. HTH Alex -- 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. -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
