wwkloo wrote
> I am trying to check the underline and overstrike status of characters in
> a PDF.
>
> I heard that underline and overstrike are achieved by graphical objects in
> PDF. So I tried to detect the rectangle and line objects first. Based on
> their position and the bounding box position of characters, I may be able
> to identify which character is underlined and which is overstrike.
> [...]
> The rectangle here is the page and can be ignored. However, the lines seem
> to be a different coordinate system to the page. Any idea. Please help.
> [...]
> byte[] pageBytes = reader.GetPageContent(pg);
> PRTokeniser tokeniser = new PRTokeniser(new
> RandomAccessFileOrArray(pageBytes));
>
> PRTokeniser.TokType tokenType;
> string tokenValue;
> while (tokeniser.NextToken())
> {
> }
Your mistake is that you think you can simply extract line and rectangle
definition operations without taking the context into account. Firstly there
may be operators inbetween which change the coordinate system (which most
likely irritates you looking at the coordinates); secondly line and
rectangle definitions are not only used for drawing such figures but can
also serve to trim output to come. E.g. the page-sized rectangle you see
most likely either fills the background with white or trims following output
to the page area. Furthermore you ignore xobjects completely.
I would recommend you use the classes in the parser package as templates and
study the PDF specification.
Regards,
Michael
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