how I described in this thread I have seen some zoom limitation in JFreeChart.
It is reproducible in XYStepRendererDemo1 from the Developers Guide (v. 1.0.13).
After a few zoom actions the line disappears.
But if you resize the window larger the line reappears.
http://img577.imageshack.us/i/step1k.png/
It is possible to rise the precision of JFreeChart zoom?
Thanks so much in advance