#!/usr/bin/perl# Explore rrd via clickable graphs by. james@type-this.com (Claus Norrbohm)# Basic idea: click high -> zoom out, click low -> zoom in,# click left -> back history, click right -> forward historyuse CGI::Carp;use CGI;use POSIX;use lib qw( /usr/local/rrdtool/lib/perl );use RRDs;my $query = new CGI;# modify as needed$hight = 300; # Image size$width = 600;$refresh = 3600;$expiredate = strftime "%a, %e %b %Y %H:%M:%S GMT", gmtime(time); # Format date(now)$root = $ENV{"DOCUMENT_ROOT"}; # Location of rrdprint "Content-type: text/html\n"; # Use htmlprint "Cache-Control: no-cache\n"; # Ensure no cashing of pageprint "Expires: $expiredate\n"; # Expire nowprint "Refresh: $refresh\n\n";print $query->start_html("Clickable rrd-graph"); # Title of html pageif ($query->param()) { # the form has already been filled out  $rrd = $query->param("rrd"); # which rrd file are we tracking  $start = $query->param("start"); # Start time  $end = $query->param("end"); # End time  $x = $query->param("img.x"); # x/y cordinates of click  $y = $query->param("img.y");  # see contrib/rrdfetchnames  my ($begin,$step,$name,$data) = RRDs::fetch "$root$rrd","AVERAGE","--start","now","--end","start+1";  if ( my $ERR = RRDs::error) {    die "ERROR while fetching data from $NAME $ERR\n";  }  @names = @$name; # list of DS's "@$name"  $j = @names;  $esu = "";  for ($i = 0; $i < $j; $i++) { # here we find which DS we are curently tracking    if ($query->param("@names[$i]") == "1") {      @use[$i] = 1;      $esu .= "1"; # DS included    } else {      @use[$i] = 0;      $esu .= "0"; # DS not included    }  }  $intv = $end - $start; # Last used interval  $zoom = ($hight + 100 - $y) / $hight; # Find zoom factor + 100 because hight is not exact  $center = $start + $intv * $x / $width;  # Find time corresponding to click  $start = int($center - $intv * $zoom); # Calc new start  $end = int($center + $intv * $zoom); # Calc new end} else { # first time through, so present clean form  $rrd = $ENV{"REQUEST_URI"}; # Location of rrd  $end = time(); # use now for end  $start = $end - 86400; # and go back 24 hours  # see rrdfetchnames  my ($begin,$step,$name,$data) = RRDs::fetch "$root$rrd","AVERAGE","--start","now","--end","start+1";  if ( my $ERR = RRDs::error) {    die "ERROR while fetching data from $NAME $ERR\n";  }  @names = @$name; # list of DS's "@$name"  $j = @names;  $esu = "";  for ($i = 0; $i < $j; $i++) { # All DS is included first time    @use[$i] = 1;    $esu .= "1";  }}# Create a form with clickable image see page xxx in: Wallace, Shawn P.# Programming Web Graphics with Perl# and GNU Software# O'Reilly UK,1999, UK, Paperbackprint "<FORM ACTION=\"$rrd\">\n";print "<TABLE border=\"0\">\n";print "<TR><TD colspan=\"3\" align=\"center\">Click on top to zoom out</TD></TR>\n";print "<TR><TD align=\"right\">Click<BR>left<BR>to<BR>go<BR>back<BR>in<BR>time</TD>";print "<TD>\n";# png.cgi prints the rrd graph, by printing to std.out (browser)print "<INPUT TYPE=\"image\" NAME=\"img\" SRC=\"/cgi-bin/png.cgi?rrd=$rrd&start=$start&end=$end&hight=$hight&width=$width&use=$esu\">\n";print "<INPUT TYPE=\"hidden\" NAME=\"start\" VALUE=\"$start\">\n";print "<INPUT TYPE=\"hidden\" NAME=\"end\" VALUE=\"$end\">\n";print "<INPUT TYPE=\"hidden\" NAME=\"rrd\" VALUE=\"$rrd\">\n";print "</TD>";print "<TD align=\"left\">Click<BR>right<BR>to<BR>go<BR>forward<BR>in<BR>time</TD></TR>\n";print "<TR><TD colspan=\"3\" align=\"center\">Click on bottom to zoom in</TD></TR>\n";print "</TABLE>\n";print "<BR><HR><BR><TABLE border=\"0\"></TD><TD>Select / Deselect DS: </TD>\n";for ($i = 0; $i < $j; $i++) { # present user with list of DS to select / deselect  if (@use[$i] == 0) {    print "<TD><INPUT TYPE=\"checkbox\" NAME=\"@names[$i]\" VALUE=1>@names[$i] </TD>\n";  } else {    print "<TD><INPUT TYPE=\"checkbox\" NAME=\"@names[$i]\" VALUE=1 CHECKED>@names[$i] </TD>\n";  }}print "</TR></TABLE>\n";print "</FORM>\n";print "<P ALIGN=\"RIGHT\">Created by - Claus Norrbohm - <A HREF=\"mailto:james\@type-this.com\">james\@type-this.com</A></P>";print $query->end_html(); # lmth ....