I modified your files so that each bar can have a title and the graph can have an offset.
I have attached a snapshot of what a graph looks like, a diff of what I modified, and an example of how to get the example to show up.
I am using this with a budgeting website that I am soon going to add as a new sourceforge project.
When rendering a Sparkline with this data set all of the maximum values (100 in this example) will be cutoff. This is only a problem when using the Resample option.
I am not sure the root of the problem, but I found that it can be worked around by changing line 227 of Sparkline_Line.php to:
$imageVCHandle = $this->CreateImageHandle($xVC + 1, $yVC + 1);.
