Re: Detect Lines in PDF

I've made some progress on this task but there are still some things I'm unsure about.  I figured out I could setup a PDFContentStreamProcessor and get all line values from the Pdf operators like this snippet below.  The only remaining problem is I can't get the CTM so my line coordinates are off.

                Listener listener = new Listener();
                PdfContentStreamProcessor processor = new PdfContentStreamProcessor(listener);
                CountOps counter = new CountOps(); //IContentOperator
                processor.RegisterContentOperator("q", counter);
                processor.RegisterContentOperator("cm", counter);
                processor.RegisterContentOperator("m", counter);
                processor.RegisterContentOperator("l", counter);
                processor.RegisterContentOperator("S", counter);
                processor.RegisterContentOperator("Q", counter);
                processor.ProcessContent(ContentByteUtils.GetContentBytesForPage(reader, 1), res);


Is there any way to get the CTM in my IContentOperator class as the operators are found?  I assume I need the CTM so then I can add the matrix found with the cm operator to find the real coordinates of the line.

Any help would be appreciated.

Thanks,
Darren



On Friday, August 29, 2014 1:07 AM, Darren Schroeder <[email protected]> wrote:
 


Is there an easy way with iTextSharp to detect lines in PDF files?

I see the lines in a stream but I'm not sure how to parse them out of there nor do I know how to convert them from the current transform matrix.  For this given PDF there are 4 horizontal lines and 3 vertical lines.

q 1 0 0 1 19.96 538.9747 cm 
0 0 m 
716.89 0 l 
S 
Q 
q 1 0 0 1 19.96 399.63 cm 
0 0 m 
716.89 0 l 
S 
Q 
q 1 0 0 1 19.96 268.3525 cm 
0 0 m 
716.89 0 l 
S 
Q 
q 1 0 0 1 19.96 141.3561 cm 
0 0 m 
716.89 0 l 
S 
Q 
0 0 0 1 K 
/GS1 gs 
q 1 0 0 1 184.01 538.4 cm 
0 0 m 
0 -509.96 l 
S 
Q 
q 1 0 0 1 368.6952 659.88 cm 
0 0 m 
0 -631.44 l 
S 
Q 
q 1 0 0 1 561.25 538.4 cm 
0 0 m 
0 -509.96 l 
S 
Q

Thanks,
Darren
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iText(R) is a registered trademark of 1T3XT BVBA.
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