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Statistics Configuration
------------------------
1) Introduction
This document describes the configuration of the statistics page, in relation
to how the various graphs are to be generated.
2) Look&Feel Parameters
There are four separate configuration variables available in include/config.php
or include/local_config.php for customizing the look and feel of the graphs.
2.1) $CONFIG_VARS['stats.piechart_12oclock'] = [TRUE | FALSE];
Starts the first slice at 12-o'clock instead of the default 3-o'clock.
2.2) $CONFIG_VARS['stats.piechart_sort'] = [ 'asc' | 'desc' | undefined ]
If 'asc', the elements will be drawn in order of increasing value.
If 'desc', the elements will be drawn in order of decreasing value.
Otherwise, the elements will be drawn in arbitrary order.
In the first two cases, elements with the same values will be
sorted alphanumerically by their key.
2.3) $CONFIG_VARS['stats.category_barchart'] = [TRUE | FALSE];
If TRUE, produce a bar chart instead of a pie graph. Items that do
not fit in the chart will be omitted, so the caller should set
$sort if the data has not already been ordered.
2.4) $CONFIG_VARS['stats.barchart_sort'] = [ 'asc' | 'desc' | undefined ]
If 'asc', the elements will be drawn in order of increasing value.
If 'desc', the elements will be drawn in order of decreasing value.
Otherwise, the elements will be drawn in arbitrary order.
In the first two cases, elements with the same values will be
sorted alphanumerically by their key.
2.5) $CONFIG_VARS['stats.piechart_striped'] = [ TRUE | FALSE ]
If TRUE, pie charts will have segments of alternating colours.
This makes it easier to distinguish small slices.
3.0) Configuration Parameters
3.1) $CONFIG_VARS['stats.image_type'] = ['png'|'jpg'|'jpeg'|'gif'];
Defines the output format of the images. This will often depend on what kind
of GD library configuration you have available. In many cases 'gif' will not
be available due to copyright restrictions.
4) GD Library issues
Several people have reported issues with getting GD to work with various
configurations.
The include/config.php variable $CONFIG_VARS['chart.gd.library'] is provided
for systems where the GD extension is not enabled in php.ini. However another
user has reported a problem with loading the GD extension using the dl(...)
command, when running OpenDb on a Multitreaded Web server. (IIS 5.0 for instance).
In this case, you have no choice but to enable the GD extension in the php.in file.
If you do not have access to this file (a hosted service), and GD is not enabled, and
you are using a Multitreaded Web server such as IIS 5.0, which does not support dl(...),
then you may not be able to generate the stats charts.
4.1) Configuration
4.1.1) Windows - IIS 5.0 (may also be applicable for Apache as well)
You have to configure PHP to use php_gd.dll. This is done be finding the
following line in your php.ini and uncomment it ( remove the ";" ).
;extension=php_gd.dll
Thanks to Agner Ringsborg Madsen for this information
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