How can I draw a chart with a TimeSeries in jfreecharts that doesn't interpolate date values for me?

Seems to me jfreechart is doing as you asked it. For example, when you say.

Seems to me jfreechart is doing as you asked it. For example, when you say: "If I choose hours, it shows data by day with many bars in between each day (ie, 24 little bars inside the day). " The code you supplied adds an item to the collection for each hour, therefore a separate little bar for each hour is appropriate.

If you change the collection adding logic to only add a value at the time you decide (say once a day at midnight), it should only produce a single bar in the chart for the day in question. In the past I've simply poked values in to the nearest second (not that you need that accuracy), and jfreechart will take care of the rest, depending on the time scale you choose (either programatically or interactively). As in: TimeSeriesCollection dataset = new TimeSeriesCollection(); TimeSeries series = new TimeSeries("Basal", Second.

Class); for (BasalRate basal : pInsulin. Basals) { Second lSecond = new Second(basal.getTime()); series. AddOrUpdate(lSecond, basal.getValue()); } dataset.

AddSeries(series).

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