Hi Bruno, hi Paulo, hi all,
thanks again.
I have to admit I feel great by talking to the authors (both) of the book
and receive such fast and complete reply.
My experience with Adobe PDF reference documentation is that it is HUGE, and
your reply
saved the trouble to search there. Thank you so much again.
George> Date: Thu, 13 Mar 2008 13:19:01 +0100> From: [EMAIL PROTECTED]> To:
itext-questions@lists.sourceforge.net> Subject: Re: [iText-questions] Method
Clarification needed> > George Bilalis wrote:> > Q: What are the exact
parameters saved (- or restored by restoreState())> > by this method?> > You
probably know this and it's very obvious, but in case> you didn't know:
saveState doesn't really save anything in> your Java program (in any case:
nothing essential).> The only important thing the methods saveState and
restoreState> do is writing a 'q' (save) or a 'Q' (restore) to the
OutputStream> (and some whitespace). This is the 'stupid' answer, in case your>
question is a 'newbie' question ;-)> > The actual 'saving/restoring of the
graphics state' happens> in the PDF viewer. The PDF viewer has to keep track of
properties> such as the current line width, current fill color, current stroke>
color, and so on.> > This is how the PDF Reference describes it (section 4.3.1
p214-215):> > "A well-structured PDF document typically contains many
graphical> elements that are essentially independent of each other and
sometimes> nested to multiple levels. The graphics state stack allows these>
elements to make local changes to the graphics state without disturbing> the
graphics state of the surrounding environment.> > The stack is a LIFO (last in,
first out) data structure in which the> contents of the graphics state can be
saved and later restored using> the following operators:> > * The q operator
pushes a copy of the entire graphics state onto the> stack.> * The Q operator
restores the entire graphics state to its former value> by popping it from the
stack.> > These operators can be used to encapsulate a graphical element so
that> it can modify parameters of the graphics state and later restore them> to
their previous values. Occurrences of the q and Q operators must be> balanced
within a given content stream (or within the sequence of> streams specified in
a page dictionary’s Contents array)."> > The answer to your question "what are
the exact parameters" is> the "entire graphics state". If you want a list,
please read> chapter 4 and 5 of the PDF Reference (it's about 300 pages,> I
can't copy/paste all this in a mail).> > This is the intelligent answer,
probably the one you expected.> br,> Bruno> >
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