[jira] [Comment Edited] (PDFBOX-2197) Add sample how to import a page as PDFormXObject

["Michael Klink (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-2197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169149#comment-14169149 ] 

Michael Klink edited comment on PDFBOX-2197 at 10/13/14 10:01 AM:
------------------------------------------------------------------

I posted a proof-of-concept based on the current 2.0.0 SNAPSHOT on stackoverflow, cf. [this SO answer|http://stackoverflow.com/a/26299557/1729265]. The original poster of the stackoverflow question pointed me to this issue here. The essentials:

A method to import a page from some document into a target document as form xobject:

{code:title=importAsXObject helper}
PDFormXObject importAsXObject(PDDocument target, PDPage page) throws IOException
{
    final PDStream src = page.getContents();
    if (src != null)
    {
        final PDFormXObject xobject = new PDFormXObject(target);

        OutputStream os = xobject.getPDStream().createOutputStream();
        InputStream is = src.createInputStream();
        try
        {
            IOUtils.copy(is, os);
        }
        finally
        {
            IOUtils.closeQuietly(is);
            IOUtils.closeQuietly(os);
        }

        xobject.setResources(page.findResources());
        xobject.setBBox(page.findCropBox());

        return xobject;
    }
    return null;
}
{code}

A sample using that helper method to import a page from some document as an XObject and put it onto a page twice with different rotations and scales.

{code:title=importAsXObject example}
PDDocument source = PDDocument.loadNonSeq(SOURCE, null);
List<PDPage> pages = source.getDocumentCatalog().getAllPages();

PDDocument target = new PDDocument();
PDPage page = new PDPage();
PDRectangle cropBox = page.findCropBox();
page.setResources(new PDResources());
target.addPage(page);

PDFormXObject xobject = importAsXObject(target, pages.get(0));
page.getResources().addXObject(xobject, "X");

PDPageContentStream content = new PDPageContentStream(target, page);
AffineTransform transform = new AffineTransform(0, 0.5, -0.5, 0, cropBox.getWidth(), 0);
content.drawXObject(xobject, transform);
transform = new AffineTransform(0.5, 0.5, -0.5, 0.5, 0.5 * cropBox.getWidth(), 0.2 * cropBox.getHeight());
content.drawXObject(xobject, transform);
content.close();

target.save(TARGET);
target.close();
source.close();
{code}

For a source page like this

!http://i.stack.imgur.com/yDdjI.png!

the result is this:

!http://i.stack.imgur.com/Zb9lf.png!

As mentioned above this is only a proof of concept, neither have corner cases been taken into account nor is the code optimized.


was (Author: mkl):
I posted a proof-of-concept based on the current 2.0.0 SNAPSHOT on stackoverflow, cf. [this SO answer|http://stackoverflow.com/a/26299557/1729265]. The original poster of the stackoverflow question pointed me to this issue here. The essentials:

A method to import a page from some document into a target document as form xobject:

{code:title=importAsXObject helper}
PDFormXObject importAsXObject(PDDocument target, PDPage page) throws IOException
{
    final PDStream src = page.getContents();
    if (src != null)
    {
        final PDFormXObject xobject = new PDFormXObject(target);

        OutputStream os = xobject.getPDStream().createOutputStream();
        InputStream is = src.createInputStream();
        try
        {
            IOUtils.copy(is, os);
        }
        finally
        {
            IOUtils.closeQuietly(is);
            IOUtils.closeQuietly(os);
        }

        xobject.setResources(page.findResources());
        xobject.setBBox(page.findCropBox());

        return xobject;
    }
    return null;
}
{code}

A sample using that helper method to import a page from some document as an XObject and put it onto a page twice with different rotations and scales.

{code:title=importAsXObject example}
PDDocument source = PDDocument.loadNonSeq(SOURCE, null);
List<PDPage> pages = source.getDocumentCatalog().getAllPages();

PDDocument target = new PDDocument();
PDPage page = new PDPage();
PDRectangle cropBox = page.findCropBox();
page.setResources(new PDResources());
target.addPage(page);

PDFormXObject xobject = importAsXObject(target, pages.get(0));
page.getResources().addXObject(xobject, "X");

PDPageContentStream content = new PDPageContentStream(target, page);
AffineTransform transform = new AffineTransform(0, 0.5, -0.5, 0, cropBox.getWidth(), 0);
content.drawXObject(xobject, transform);
transform = new AffineTransform(0.5, 0.5, -0.5, 0.5, 0.5 * cropBox.getWidth(), 0.2 * cropBox.getHeight());
content.drawXObject(xobject, transform);
content.close();

target.save(TARGET);
target.close();
source.close();
{code}

For a source page like this

!http://i.stack.imgur.com/yDdjI.png!

the result is this:

!http://i.stack.imgur.com/Zb9lf.png!

As mentioned above this is only a proof of concept, corner cases have not yet been taken into account, neither is the code optimized.

> Add sample how to import a page as PDFormXObject
> ------------------------------------------------
>
>                 Key: PDFBOX-2197
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2197
>             Project: PDFBox
>          Issue Type: Task
>          Components: Documentation
>    Affects Versions: 2.0.0
>            Reporter: Maruan Sahyoun
>            Assignee: Maruan Sahyoun
>            Priority: Trivial
>             Fix For: 2.0.0
>
>
> Add an example to the pdfbox examples how to import a page from another document into a master document as PDFormXObject



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