I need a stacked bar graph stacked but overlaying data help please

Hi,
I have a requirement to change an existing combination graph.
Currently we use a combination graph that has a bar that shows the usage accross a number of weeks, with a line that shows total available over the top. So the customer can see what they have used in a week against themaximun it could be used in that week.
Unfortunatley our customer would like this changes to a single bar graph that shows the usage and then if the total available is more than the usage (it is sometimes the same but never less) then this should be added to the bar graph to increase the bar in a different colour.
I have looked at Reports 10g and the stacked bar graph seems perfect but this adds the two values together and not just the increase. I know i could minus one from the other but with the way my data is structured in the data model this could be a pain as they are linked via a data link in the data model and also seems a bit of a work around. Is there no way to have a overlay on the stacked graph or is there another way to achieve this that i cant see.
Thanks

I was able to figure it out.
Instead of using creating the dataset using:
CategoryDataset datasetWorkload = DatasetUtilities.createCategoryDataset()
if a 'DefaultCategoryDataset' is used, the values to be displayed can be customised:
DefaultCategoryDataset result = new DefaultCategoryDataset();
result.addValue(200.0, "Allocated", "Jan 04");
result.addValue(500.0, "Allocated", "Feb 04");
result.addValue(10.3, "Over-Allocated", "Jan 04");
result.addValue(16.2, "Over-Allocated", "Feb 04");
Thanks for your time, users: wpafbuser1 and practissum.

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I think all you need to do is implement the code found below. What you need is instead of using the random numbers (like in my example), you would just give it the values for you bar graphs. You can then build an array where you append the values for the second color above the first color by using the add function. If you then go into the plot legend (left click and go into bar plots), you can change the presentation of the data on the graph. You will also have to change the common plots display in the legend as well (left-click and go into common plots). I hope this helps!
Message Edited by CarlaU on 04-10-2008 09:13 AM
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Attachments:
BarStackedGraph.PNG ‏5 KB
StackedGraph.vi ‏13 KB

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