Q: I would like to change information within a PDF’s form fields. Part
of my project involves a field of text on a curved path (e.g. a text
on a circle - as on a stamp).
To my knowledge, Acrobat Professional cannot handle anything other
than a square text field. Are you aware of any software that I may
create my text on a path, and assign that as a field in a PDF.
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A: You can use PDFNet SDK (www.pdftron.com/net) to programmatically
stamp existing PDF documents with curved text (e.g. text on a path)
and you can also assign any graphical content as a custom appearance
to a form field.
As a starting point you may want to take a look at InteractiveForms
sample project (http://www.pdftron.com/net/
samplecode.html#InteractiveForms) and in particular code that uses
CreateCheckmarkAppearance() or CreateButtonAppearance(). These
functions generate custom appearance for form fields and can be used
instead of field.RefreshAppearance() to assign custom appearances to
form fields.
For more information on how to generate custom appearance you may want
to take a look at ElementBuilder sample project or search PDFNet KB
(http://groups.google.com/group/pdfnet-sdk/) for keywords such as
"SetAppearance".