examples/stripes.pl

   1 #! /usr/bin/perl
   2
   3 #makes things work when run without install
   4 use lib qw( ../bindings/perl-shared/blib/lib ../bindings/perl-shared/blib/arch );
   5
   6 #makes programm work AFTER install
   7 use lib qw( /usr/local/rrdtool-1.1.0/lib/perl ../lib/perl );
   8
   9 use strict;
  10 use vars qw(@ISA $loaded);
  11
  12 use RRDs;
  13 my $start=time;
  14 my $rrd="randome.rrd";
  15 RRDs::create ($rrd, "--start",$start-1, "--step",300,
  16               "DS:a:GAUGE:600:U:U",
  17               "DS:b:GAUGE:600:U:U",
  18               "RRA:AVERAGE:0.5:1:200");
  19 my $ERROR = RRDs::error;
  20 die "$0: unable to create `$rrd': $ERROR\n" if $ERROR;
  21 my $t;
  22 for ($t=$start; $t<$start+200*300; $t+=300){
  23   RRDs::update $rrd, "$t:".rand(100).":".(sin($t/800)*50+50);
  24   if ($ERROR = RRDs::error) {
  25     die "$0: unable to update `$rrd': $ERROR\n";
  26   }
  27 }
  28 RRDs::graph "stripes.png",
  29   "--title", 'Stripes Demo',
  30   "--start", $start,
  31   "--end", "start + 400 min",
  32   "--interlace",
  33   "--imgformat","PNG",
  34   "--width=450",
  35   "DEF:a=$rrd:a:AVERAGE",
  36   "DEF:b=$rrd:b:AVERAGE",
  37   "CDEF:alpha=TIME,1200,%,600,LT,a,UNKN,IF",
  38   "CDEF:beta=TIME,1200,%,600,GE,b,UNKN,IF",
  39   "AREA:alpha#0022e9:alpha",
  40   "AREA:beta#00b674:beta",
  41   "LINE1:b#ff4400:beta envelope\\c",
  42   "COMMENT:\\s",
  43   "COMMENT:CDEF\:alpha=TIME,1200,%,600,LT,a,UNKN,IF",
  44   "COMMENT:CDEF\:beta=TIME,1200,%,600,GE,b,UNKN,IF\\j";
  45 if ($ERROR = RRDs::error) {
  46   print "ERROR: $ERROR\n";
  47 };
  48
  49
  50 print "This script has created stripes.png in the current directory\n";
  51 print "This demonstrates the use of the TIME and % RPN operators\n";