I have created a horizontal stacked bar chart using the VFP6
ChartFX component. The y axis represents different candy a child
has eaten. The x axis represents the number of days from joining
my survey. Most children join my survey first, then eat candy. This
is fine because the duration they are eating candy
obviously extends from left to right starting from 0.
The problem is that some children are already eating candy
before they join my survey.

eg. Fred was eating Snickers from 1/7/1999 to 10/7/1999
but joined my survey on 3/7/1999. So the x axis must plot from
-2 number of days from joining.

How do I plot this? Graphics Server manages it fine but I have don't
want to rely on 3rd parties.

Any ideas fellow troubleshooters?