Can you provide a method to adjust the size of the pdf to A4 size, and also include the adaptation of AcroForms? about openpdf HOT 9 OPEN

Can one assume that the content of the pages already fits on A4 and one merely has to increase or decrease the margins? Then it suffices to change media and crop boxes.
Or is it necessary to scale or even reflow the content?

from openpdf.

It should be necessary to scale. Such as this pdf：
dabaoz1.pdf
It's too big to see it all.

from openpdf.

You want to read an existing PDF and than recreate it with a "better" PageSize?

from openpdf.

change into

from openpdf.

I think, if you want to scale and reflow the content, you can use OpenPDF to do this. But this functionality is quite high level to implement directly in the library. I don't even know how one could do this. The text must be extracted, and den inserted in the new document. And images too. A very complex task.

from openpdf.

I tried itext，It can move the content of the page, but AcroForms are lost，How to transfer AcroForms as is，Like the 6.pdf this file, how complete scale：

PdfReader pdfReader = new PdfReader(source);
Document doc = new Document();
PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(target));
doc.open();
PdfContentByte cb = writer.getDirectContent();
for(int i = 1; i <= pdfReader.getNumberOfPages(); i++){
PdfImportedPage page = writer.getImportedPage(pdfReader, i);
float width = page.getWidth();
float height = page.getHeight();
doc.setPageSize(new com.itextpdf.text.Rectangle(PageSize.A4.getHeight(), PageSize.A4.getWidth()));
doc.newPage();
float widthScale = getWidthScale(height);
float heightScale = getHeightScale(width);
cb.addTemplate(page, widthScale, 0, 0, heightScale,0,0);
}
doc.close();

from openpdf.

Copying the page with getImportedPage actually only copies the static page content, annotations are lost. Thus, I would propose instead to change the media box and crop box of the page and prepend a scaling transformation to the page content stream.

Scaling (obviously) changes the coordinates of the content. Thus, all other objects that also contain coordinates on the page, need to be adjusted. This includes the annotations but also objects like link destinations.

from openpdf.

Is there any code example of specific implementation? thanks.

from openpdf.

I fear there is no such an example. This is a very specific problem, and scaling thinks around is not trivial. Such an example "could" be in pdf-toolbox, but maybe it won't be a "simple" one.

from openpdf.