Exponential tick on linear yAxis - JFreeChart

Question

I have a chart with a logarithmic yAxis like this one:

As we can see, the yAxis have exponential ticks (I setted it that way with yAxis.setExpTickLabelsFlag(true);). Here is the same chart with a linear axis (the one by default when creating a xylineChart):

Unfortunately, my values on the yAxis can't be formatted with exponential ticks because it is not a LogarithmicAxis. How can I force it to?

@trashgod it seems to be the way to achieve it thank you. I used `yAxis.setNumberFormatOverride(new DecimalFormat("0.######E0"));` but I want to set the exponential as a lower case like `1e5`. Replacing the `E` by `e` give me an illegal argument error. By the way, don't hesitate to post is as an answer so that I can mark it as the solution. — pioupiou1211, Apr 12 '17 at 07:17
@trashgod either this or make the ticks of the `logarithmicAxis` to upper case. I want something symetric. — pioupiou1211, Apr 12 '17 at 07:38

score 1 · Accepted Answer · edited May 23 '17 at 12:17

1

As shown here, you can invoke setNumberFormatOverride() to set the desired DecimalFormat. You can invoke the setExponentSeparator() method of DecimalFormatSymbols to set the desired exponent separator.

DecimalFormatSymbols symbols = new DecimalFormatSymbols();
symbols.setExponentSeparator("e");
DecimalFormat format = new DecimalFormat("0.######E0", symbols);
yAxis.setNumberFormatOverride(format);

Alternatively, you should be able to modify the numberFormatterObj of LogarithmicAxis in a custom implementation of setupNumberFmtObj(), seen here, but I haven't tried it.

edited May 23 '17 at 12:17

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answered Apr 12 '17 at 10:45

trashgod

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Thanks a lot that's exactly what I was looking for. – pioupiou1211 Apr 12 '17 at 11:48

Exponential tick on linear yAxis - JFreeChart

1 Answers1