Scale an existing page

[MichelMelhem]

Hello, I'm quite new to pdfbox and i'm countering an issue. I want to convert an existing page to a vector graphics picture using your lib and then rescale it down to a4 and redraw it on a new page. I think i should be possible whith your lib but i couldn't find how i can achieve that. Do you have an idea how i can achieve that ? Or even if it is possible ? Thank you !

This is my actual code that do not work :

    public void scale() throws IOException {
        PDDocument document = PDDocument.load(pdf);

            PDPage page =  document.getPage(0);
            PDPageContentStream contentStream = new PDPageContentStream(document, page);
            PdfBoxGraphics2D pdfBoxGraphics2D = new PdfBoxGraphics2D(document, page.getMediaBox().getWidth(), page.getMediaBox().getHeight());
            pdfBoxGraphics2D.dispose();

            PDFormXObject appearanceStream = pdfBoxGraphics2D.getXFormObject();
            Matrix matrix = new Matrix();
            float xScale = PDRectangle.A4.getWidth() / page.getMediaBox().getWidth();
            float yScale = PDRectangle.A4.getHeight() / page.getMediaBox().getHeight();
            matrix.scale(xScale, yScale);

            contentStream.saveGraphicsState();
            contentStream.transform(matrix);
            contentStream.drawForm(appearanceStream);
            contentStream.restoreGraphicsState();

            contentStream.close();

        document.save(pdf);
        document.close();
    }

[rototor]

What you want to do has nothing to do with this Graphics2D adapter. You "just" want to resize an existing page.

More something like this

 public void scale() throws IOException {
        PDDocument document = PDDocument.load(pdf);

            PDPage page =  document.getPage(0);
            PDPageContentStream contentStreamBefore = new PDPageContentStream(document, page, AppendMode.Prepend, true);

            Matrix matrix = new Matrix();
            float xScale = PDRectangle.A4.getWidth() / page.getMediaBox().getWidth();
            float yScale = PDRectangle.A4.getHeight() / page.getMediaBox().getHeight();
            matrix.scale(xScale, yScale);

            contentStreamBefore.transform(matrix);
            contentStreamBefore.close();

        document.save(pdf);
        document.close();
    }

This will add a transform to the whole page by adding an additional content stream with the transform matrix before the existing content.

I did not test this, but should work. (Maybe you need to invert xScale and yScale, as said did not test, so you may need to do a matrix.scale(1/xScale,1/yScale)).

This question is something for the PDFBox user mailing list or StackOverflow, as it's not related to this project.

[MichelMelhem]

Thank you, I thought I could be related to this project but no