setUpperMargin dosen't work when the values are the same

[alemjann]

I use

Code: Select all

(NumberAxis)categoryplot.getRangeAxis().setUpperMargin();

in line chart. it works well. But when there is only one line in the chart and the values of all points of the line are equal, the line and the value label goes out of the top of the rangeAxis and been cut.
Help!