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If need be you could always use presort your datasets with a tree map or the like before adding your dataset to JFreeChart. That way your have control in java for how the map would sort your datasets. Then to extract the datasets out of the map using any one of a number of map looping mechanisms to ...

While yes 1.4e-45 is smaller than 2.2e-16, the level of zoom will be noticeably negligible. Any zooming will be lost when trying to actually see the data. If zooming is required then an implementation of the ItemLabelGenerator would easily assist with that.

I found a work around by setting the value to Math.ulp(1.0) to get a near zero value to get what I'm looking for. The source of the issue seem to come from the StackedAreaRender.drawItem method.

You might be able to try a . If you look in the JFreeChart Demo Collection an example of it is located in Bar Charts > Category Plot > SlidingCategoryDatasetDemo1 and SlidingCategoryDatasetDemo2.

When my low point for a StackedAreaRender is not 0.0 the plot that is produced looks fine. The issue that I'm having comes in when I have data that has a low point of 0.0. The issue draws the filled area halfway between two categories and makes the plot look off. Here is my code which is working fin...