examples/stripes.pl.in

   1 #! @PERL@
   2 use lib qw( @prefix@/lib/perl );
   3
   4 use strict;
   5 use vars qw(@ISA $loaded);
   6
   7 use RRDs;
   8 my $start=time;
   9 my $rrd="random.rrd";
  10 RRDs::create ($rrd, "--start",$start-1, "--step",300,
  11               "DS:a:GAUGE:600:U:U",
  12               "DS:b:GAUGE:600:U:U",
  13               "RRA:AVERAGE:0.5:1:200");
  14 my $ERROR = RRDs::error;
  15 die "$0: unable to create `$rrd': $ERROR\n" if $ERROR;
  16 my $t;
  17 for ($t=$start; $t<$start+200*300; $t+=300){
  18   RRDs::update $rrd, "$t:".rand(100).":".(sin($t/800)*50+50);
  19   if ($ERROR = RRDs::error) {
  20     die "$0: unable to update `$rrd': $ERROR\n";
  21   }
  22 }
  23 RRDs::graph "stripes.png",
  24   "--title", "Stripes Demo",
  25   "--start", $start,
  26   "--end", "start + 400 min",
  27   "--interlace",
  28   "--imgformat","PNG",
  29   "--width=450",
  30   "DEF:a=$rrd:a:AVERAGE",
  31   "DEF:b=$rrd:b:AVERAGE",
  32   "CDEF:alpha=TIME,1200,%,600,LT,a,UNKN,IF",
  33   "CDEF:beta=TIME,1200,%,600,GE,b,UNKN,IF",
  34   "AREA:alpha#0022e9:alpha",
  35   "AREA:beta#00b674:beta",
  36   "LINE1:b#ff4400:beta envelope\\c",
  37   "COMMENT:\\s",
  38   "COMMENT:alpha=TIME,1200,%,600,LT,a,UNKN,IF",
  39   "COMMENT:beta=TIME,1200,%,600,GE,b,UNKN,IF\\j";
  40 if ($ERROR = RRDs::error) {
  41   print "ERROR: $ERROR\n";
  42 };
  43
  44
  45 print "This script has created stripes.png in the current directory\n";
  46 print "This demonstrates the use of the TIME and % RPN operators\n";