roquegil,
roquegil wrote
> I would to catch some existing information in a specific area, and move it
> to the right.
>
> ...
>
> At this moment I've found one solution which is not ideal but should
> works.
A good generic solution is difficult indeed. Even though the content to move
visually probably is an obvious unit, the drawing operations for it may not
be; they may be spread over the page content stream, maybe some parts even
are to be found in some inner xobjects, there can even be single drawing
operations drawing both stuff to move and other stuff not to move.
On the other hand, though, you can make use of clipping paths, first drawing
the whole page at its original position with a clipping path hiding the
original area, and then drawing the whole page again moved as the area shall
shift, with a clipping path only allowing drawings in the target area.
E.g.:
public void copyWithMovedRect(PdfReader source, int pageNr, PdfWriter
target) throws DocumentException
{
PdfImportedPage page = target.getImportedPage(source, pageNr);
PdfContentByte directContent = target.getDirectContent();
Rectangle pageRect = target.getPageSize();
directContent.saveState();
// hiding this original area
directContent.rectangle(pageRect.getLeft(), pageRect.getBottom() +
650, 300, 100);
// out of this whole page
directContent.rectangle(pageRect.getLeft(), pageRect.getBottom(),
pageRect.getWidth(), pageRect.getHeight());
directContent.eoClip();
directContent.newPath();
// draw page at original position
directContent.addTemplate(page, pageRect.getLeft(),
pageRect.getBottom());
directContent.restoreState();
// showing this shifted area
directContent.rectangle(pageRect.getLeft() + 300,
pageRect.getBottom() + 650, 300, 100);
directContent.eoClip();
directContent.newPath();
// draw page shifted
directContent.addTemplate(page, pageRect.getLeft() + 300,
pageRect.getBottom());
}
This puts the indicated page from the source PdfReader into the current page
of the target PdfWriter with the area moved.
There are some drawbacks to this solution, too:
* I use a PdfWriter and its getImportedPage method. Thus, all interactive
feature (annotations, e.g. form fields) are lost.
* The content by the clipping paths is still there, merely invisible. In
case of text this means that text extraction (including copy&paste) will see
all text twice.
Regards, Michael
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