I made some changes to the LogarithmicAxis & NumberAxis.
I reduced the code for the refreshTicks...()-methods by unifying the different calculations and the label generation (especially Log-Axis will use the same rendering for both horizontal and vertical axis).
Based/derived on code from jfreechart 1.0.1.
LogarithmicAxis with improvements.
Extends NumberAxis: A Numerical Axis with an interval starting from lower-bound of axis as described in the forum post: http://www.jfree.org/phpBB2/viewtopic.php?t=18272
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File Added: MySimpleNumberAxis.java