examples/minmax.pl.in

   1 #! @PERL@
   2
   3 use lib qw( @prefix@/lib/perl );
   4
   5 use RRDs;
   6 my $start=time;
   7 my $rrd="randome.rrd";
   8 my $name = $0;
   9 $name =~ s/\.pl.*//g;
  10
  11 RRDs::create ($rrd, "--start",$start-1, "--step",300,
  12               "DS:a:GAUGE:600:U:U",
  13               "RRA:AVERAGE:0.5:1:300",
  14               "RRA:MIN:0.5:12:300",
  15               "RRA:MAX:0.5:12:300",
  16 );
  17 my $ERROR = RRDs::error;
  18 die "$0: unable to create `$rrd': $ERROR\n" if $ERROR;
  19
  20 # dropt some data into the rrd
  21 my $t;
  22 for ($t=$start; $t<$start+300*300; $t+=300){
  23   RRDs::update $rrd, "$t:".(sin($t/3000)*50+50);
  24   if ($ERROR = RRDs::error) {
  25     die "$0: unable to update `$rrd': $ERROR\n";
  26   }
  27 }
  28
  29 RRDs::graph "$name.png",
  30   "--title", uc($name)." Demo",
  31   "--start", "now",
  32   "--end", "start+1d",
  33   "--lower-limit=0",
  34   "--interlace",
  35   "--imgformat","PNG",
  36   "--width=450",
  37   "DEF:a=$rrd:a:AVERAGE",
  38   "DEF:b=$rrd:a:MIN",
  39   "DEF:c=$rrd:a:MAX",
  40   "AREA:a#00b6e4:real",
  41   "LINE1:b#0022e9:min",
  42   "LINE1:c#00ee22:max",
  43 ;
  44
  45 if ($ERROR = RRDs::error) {
  46   print "ERROR: $ERROR\n";
  47 };
  48
  49
  50 print "This script has created $name.png in the current directory\n";
  51 print "This demonstrates the use of the TIME and % RPN operators\n";