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#!/usr/bin/perl -w
#
# DigiTemp v2.1 RRDB Temperature Graph (single sensor)
#
# Copyright 1997-2001 by Brian C. Lane <bcl@brianlane.com> www.brianlane.com
# All Rights Reserved
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
#
# REQUIRES:
# RRD tool binary
# CGI (comes with perl5)
use RRDp;
use CGI;
$cgi = new CGI; # Load the CGI routines
# Find the RRD executable, look in the standard locations
# If your rrdtool is installed someplace else, fill in the proper location
# below:
if ( -x "/usr/bin/rrdtool")
{
RRDp::start "/usr/bin/rrdtool";
} elsif ( -x "/usr/local/bin/rrdtool") {
RRDp::start "/usr/local/bin/rrdtool";
} elsif ( -x "/usr/local/rrdtool/bin/rrdtool" ) {
RRDp::start "/usr/local/rrdtool/bin/rrdtool";
} else {
die "Could not find rrdtool binary\n";
}
# The RRD database to get the data from
$rrd = "/tmp/digitemp.rrd";
# Make the variables easier to use and assign defaults if not set
if( !$cgi->param('starttime') )
{
$starttime = "-1day";
} else {
$starttime = $cgi->param('starttime');
}
if( !$cgi->param('endtime') )
{
$endtime = time;
} else {
$endtime = $cgi->param('endtime');
}
if( !$cgi->param('width') )
{
$width = "400";
} else {
$width = $cgi->param('width');
}
if( !$cgi->param('height') )
{
$height = "100";
} else {
$height = $cgi->param('height');
}
if( !$cgi->param('label') )
{
$label="";
} else {
$label = $cgi->param('label');
}
$var = $cgi->param('var');
if( !$cgi->param('color') )
{
$color = "#000000";
} else {
$color = $cgi->param('color');
}
# Diagnostic output
#print STDERR "start = $starttime\n";
#print STDERR "end = $endtime\n";
#print STDERR "width = $width\n";
#print STDERR "height = $height\n";
#print STDERR "var = $var\n";
#print STDERR "label = $label\n";
#print STDERR "color = $color\n";
# Output a HTML header for the PNG image to follow
print $cgi->header('image/png');
# Generate the graph
RRDp::cmd "graph - --imgformat PNG",
"--start '$starttime' --end '$endtime'",
"--width $width --height $height",
"DEF:temp_c=$rrd:$var:AVERAGE",
"CDEF:temp_f=temp_c,9,*,5,/,32,+",
"LINE1:temp_f$color:'$label'";
$answer=RRDp::read;
print $$answer;
RRDp::end;
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