[rrd-developers] Small patch for x-axis labeling

[Paul Boven]

Hi everyone,

While setting up Cacti, I tried to add 'Decade' graphs to it. The 
resulting x-axis labeling is a bit unreadable, hence this suggested 
patch for RRDtool. It adds major grid lines and labels per year, and 
minor divisions per quarter.

See also: http://a48046.upc-a.chello.nl/~paul/Mozilla-cpu-decade.html

I prefer using %Y (four digit years) instead of %y (two digit years).
The number '315360' for min_length was calculated to work for graphs of 
5 years and longer, when 500 pixels wide. (365 * 24 * 3600 * 5 / 500).

*** rrd_graph.c.org     Fri Jul 14 14:11:26 2006
--- rrd_graph.c Mon Jul 17 11:16:00 2006
***************
*** 60,65 ****
--- 60,66 ----
       {3*3600,            0,   TMT_WEEK,1,    TMT_MONTH,1, 
TMT_WEEK,2,    7*24*3600,"Week %V"},
       {6*3600,            0,   TMT_MONTH,1,   TMT_MONTH,1, 
TMT_MONTH,1, 30*24*3600,"%b"},
       {48*3600,           0,   TMT_MONTH,1,   TMT_MONTH,3, 
TMT_MONTH,3, 30*24*3600,"%b"},
+     { 315360,         0,   TMT_MONTH,3,   TMT_YEAR,1,    TMT_YEAR,1, 
365*24*3600,"%Y"},
       {10*24*3600,        0,   TMT_YEAR,1,  TMT_YEAR,1,    TMT_YEAR,1, 
365*24*3600,"%y"},
       {-1,0,TMT_MONTH,0,TMT_MONTH,0,TMT_MONTH,0,0,""}
   };



Regards, Paul Boven.

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