Here's the modified code, I have also upload it on
http://pastebin.com/uDHdQD9a
I don't think it is a good idea to have different X and Y scales. This
will look weird if you have photographs of objects whose shape are
known, e.g. people.
pd = PDDocument.load(input);
pdAllPages = pd.getDocumentCatalog().getAllPages();
//For proof of concept currently only converting first page.
//But once it works for first page correctly will loop
through all pages of PDF.
PDPage page = (PDPage) pdAllPages.get(0);
InputStream is = page.getContents().createInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
IOUtils.copy(is, baos);
IOUtils.closeQuietly(is);
/*
* PDDocument pdNew = new PDDocument();
* PDPage pageNew = new PDPage();
* pdNew.addPage(pageNew);
*/
PDRectangle cropBox = page.findCropBox();
//The goal here is to keep a blank space of 50 pixels on top.
//So that for all PDFs processed through this code will
leave same blank space at top.
//In below code doing scaling of width too but in case it
needs to be avoided can avoid.
float scaleX = (cropBox.getUpperRightX() - 20) /
cropBox.getUpperRightX();
float scaleY = (cropBox.getUpperRightY() - 50) /
cropBox.getUpperRightY();
System.out.println("cropBox: " + cropBox);
PDRectangle newCropBox = new
PDRectangle(cropBox.getCOSArray()); // clone
newCropBox.setLowerLeftX(cropBox.getLowerLeftX() * scaleX);
newCropBox.setLowerLeftY(cropBox.getLowerLeftY() * scaleY);
// don't do this, as it takes away the space
//newCropBox.setUpperRightX(cropBox.getUpperRightX() * scaleX);
//newCropBox.setUpperRightY(cropBox.getUpperRightY() * scaleY);
System.out.println("newCropBox: " + newCropBox);
page.setCropBox(newCropBox);
// appendContent = false, compress = true
PDPageContentStream pageContentStream = new
PDPageContentStream(pd,
page, false, true);
pageContentStream.saveGraphicsState();
System.out.println("scaleX: " + scaleX);
System.out.println("scaleY: " + scaleY);
// rectangle path
pageContentStream.appendRawCommands(String.format(Locale.US, "%f %f %f
%f re\n",
newCropBox.getLowerLeftX(),
newCropBox.getLowerLeftY(),
cropBox.getUpperRightX() * scaleX -
newCropBox.getLowerLeftX(),
cropBox.getUpperRightY() * scaleY -
newCropBox.getLowerLeftY()));
// this is just a color fill test
//pageContentStream.appendRawCommands("0 1 1 rg f\n");
// modify clipping path; path no-op.
pageContentStream.appendRawCommands("W n\n");
pageContentStream.appendRawCommands(scaleX + " 0 0 " +
scaleY + " 0 0 cm\n");
pageContentStream.appendRawCommands("% start existing
stuff\n");
pageContentStream.appendRawCommands(baos.toByteArray());
pageContentStream.appendRawCommands("\n");
pageContentStream.restoreGraphicsState();
//Commented out below code as currently
//trying to work on leaving fix height blank
//space on top for bar code
/*
* BufferedImage bim = ImageIO.read(new
File("C:\\workspaceRAD85_PDFBox_POC\\images.png"));
* PDXObjectImage img = new PDPixelMap(pd, bim);
* float x = cropBox.getUpperRightX() - bim.getWidth()-50;
* float y = cropBox.getUpperRightY() - bim.getHeight();
* pageContentStream.drawImage(img, x, y);
*/
pageContentStream.close();
IOUtils.closeQuietly(baos);
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