[rrd-users] anybody developed User trend controls

Rob Conway rjconway at bigpond.com
Sat Nov 29 23:45:39 CET 2008

Anybody else using RRD:CGI::Image  on rrdtool-1.3.1


I managed to get it installed without errors and think I am very close.  The
example page shows the “graphing error” image


When I move the slider alert(url) is showing the following string:


/hist/rrd.png.cgi?--vertical-label=pH;--title=Aquarium Statistics;
8 00:00;--end=07/05/2008 00:00;


however it does not generate a graph, however does show the error graphic so
I assume perl and the module is running. 

I was a little confused with the date format as I am in Australia its
day/month/year so I do not now if this is my problem.  ?


 When ever I try and simplify the cgi string (ie delete the start/stop times
and replace with now e-1d)  it screws up and doesn’t even return even the
“graph error” image



I have placed my rrd database file in the root of my apache2 web server
/var/www/aqua_ph.rrd  and modified the rrd.png.cgi file as below.




use strict;

use warnings;

use RRD::CGI::Image;

use CGI qw[header Vars];


print header( 'image/png' );


my $artist = RRD::CGI::Image->new(

        rrd_base  => '/var/www/',

        error_img => '/var/www/hist/graphing_error.png',

        logging   => '/var/www/hist/rrd_error.log',


$artist->print_graph( Vars() );



Does the above look ok ?

 Appreciate your advice

 Cheers from Australia



Just for reference the following RRD::Graph does work just fine and returns
a full web page with graph







 <H1>RRDCGI Example Page for <RRD::CV RRD_NAME></H1>







 <RRD::GRAPH <RRD::CV::PATH RRD_NAME>.png --lazy

          --title "Temperatures for "<RRD::CV::QUOTE RRD_NAME>

          DEF:cel=<RRD::CV::PATH RRD_NAME>.rrd:P1:AVERAGE

          LINE2:cel#00a000:"D. Celsius">





















-----Original Message-----
From: jkeroes at gmail.com [mailto:jkeroes at gmail.com] On Behalf Of Joshua
Sent: Thursday, November 27, 2008 7:26 AM
To: Rob Conway
Cc: rrd-users at lists.oetiker.ch
Subject: Re: [rrd-users] anybody developed User trend controls


There's one included as an example with the CPAN module RRD::CGI::Image

On Wed, Nov 26, 2008 at 3:28 AM, Rob Conway <rjconway at bigpond.com> wrote:

Hi all,

I just use rrdtool to collect gauge data from a number of temperature
variables and display the trends via a web page.   www.rjconway.homeip.net


I was wondering if anybody has seen a site that uses a "slider bar" under
the trend to enable the user to select another start time, or simple
calendar controls that generate the trends on-the-fly that are simply done
using forms & cgi files.  I am looking to create a ½ screen popup that
enables the user to interact with the trend history function.  At the moment
you can see from my site I simply have a drop down menus for history past
the 2 days.





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