Line Chart: Category label

Hi,
I've a little problem with the customizations of a chart.

2013-08-02 12_35_41-AvepaPentaho2 [In esecuzione] - Oracle VM VirtualBox.png

As you can see, I changed the x-axis-label rotation, but now the text looks like right aligned.

the problem degenerates when I choose a date range larger, because markers become more dense and the category labels are at the center of two markers :(
2013-08-02 12_37_27-AvepaPentaho2 [In esecuzione] - Oracle VM VirtualBox.png

I wrote a lot of code (beanshell script), done by me, taken here and there, to center labels, but nothing :'(
Some of you can help me with this problem?
thanks

Attached Images

• 2013-08-02 12_35_41-AvepaPentaho2 [In esecuzione] - Oracle VM VirtualBox.png (13.7 KB)
• 2013-08-02 12_37_27-AvepaPentaho2 [In esecuzione] - Oracle VM VirtualBox.png (16.4 KB)