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Name the series to reflect the year they're supposed to represent, but change the dates on the datapoints so they all have the same year set. You might also want to change the domain axis's DateFormat so that it will only display day/month, not year.

The user is selecting the variables from a list, right? So this doesn't sound like a problem. You have a list of available variables (indexed). You have a list of colors (using the same index). There's nothing that says that index has to match the index of the series in the renderer. Just map the tw...

If you supply NO data for those years, this will happen automatically. That is to say: If you have a series that contains year 1, year 2, year 5, year 6 and year 7...those points will be connected in sequence, with the interval between 2 and 5 appropriately wide. Change the type of the chart to LINE...

There are two ways I can think of right off the bat to do that. 1) Load all of the data up front. Disable the zoom controls. Zoom the chart (set the domain axis range) to cover a 1-year span. Provide forward and back buttons to move the range in either direction. The last part of that is quite easy ...

First, DON'T re-instantiate the chart to update it. You can end up with a memory leak that way - because of the wide variety of listeners between charts and chartPanels and so on, the old chart objects are likely to still have references and not be properly disposed. I wrestled with that one for a w...

I have one chart that's currently showing 20 series, each with 3 days of per-minute data. That's 86400 data points, and it works fine. 100000 shouldn't be a problem. I've found the main limiting factor to be heap space, and that has less to do with JFreeChart than it does with parsing the results fr...

Take an average of the whole dataset, to get a baseline. For each minute, create a datapoint that is either the maximum value for that minute or the minimum value, depending on which is further away from the day's average. That is, show the MOST EXTREME value for each time period, rather than averag...

Pavan - I'm not sure I understand. Is the problem that the datapoints being plotted don't match the data in the dataset? Or is it that the range of the X axis doesn't match the range of the data?

Only on the Java side; I haven't done anything with JFreeChart as an applet. Set up a ChartMouseListener, register it with your chart, and then get the URL from the clicked chart entity with something like: public void chartMouseClicked(ChartMouseEvent event) { System.out.println(event.getEntity().g...

Ah. Then yes, you ought to be able to handle that in JFreeChart. Getting the URL text from a clicked-on chart entity is pretty straightforward.

What sort of drill-down did you have in mind? There's a ChartMouseClick event that you can use to catch clicks on a chart entity, for instance.

I'm not sure; my log data doesn't have any fractional values, so I hadn't run into that before. I'm not actually even sure how to get gridlines for sub-1 values to show up, as changing the tick unit doesn't seem to do it. However, while looking for that, I did discover something else that might work...

Well, let's see. I don't know anything about the actual format of the data you're getting back, but from your example you'd want something ROUGHLY like this. You'll probably have to fiddle with it a bit to get it working in the context of your project. TimeSeries series = new TimeSeries(); SimpleDat...

david.gilbert wrote:You can use the setTickUnit() method to specify the gap between tick marks/labels, and the setRange() method to specify the overall range for the axis.

So, like he said. Try:

axis.setTickUnit(new NumberTickUnit(15));

Use a TimeSeries instead of an XYSeries, and (for the examples you gave, which were month and year) convert the String to a org.jfree.data.time.Month