Had used com/lowagie/itext/2.1.2 to generate the pdf.

the charts get cropped when viewed in PDF format.

This is a Windows7 issue it is not reproduced in both Adobe Reader Version 9.3.0 & 9.4.0 in Windows XP and Windows Server2003
This bug can be reproduced in Adobe Reader Version 9.3.0 & 9.4.0 in Windows7 only.
used java 1.6.0_20