I want to rotate all pages of a given PDF by 90, 180 or 270 degrees.
I read the page about matrices http://itextdocs.lowagie.com/tutorial/directcontent/coordinates/index.html#top and try understand the matrix
[ a, b, 0
c, d, 0
e, f, 1 ]
[ sX * Math.cos(angle), sY * Math.sin(angle), 0
-sX * Math.sin(angle), sY * Math.cos(angle), 0
tX, tY, 1 ]
What s, t, X and Y stand for ?
Here is my code. I tried various values for a, b, c, d, e and f, but never get a good rotation. I often get blank pages (content is out of the page), or not rotated but transformed (like a parallelogram), or a 45 degrees rotation... Never what I want :(
Can you help me ?
What are the value for the 3 angles ?
pAngle is my parameter 90, 180 or 270 degrees
FileOutputStream fos = new FileOutputStream(tmp);
//we create a reader for a certain document
PdfReader reader = new PdfReader(sourcepdfbytes[]);
//we retrieve the total number of pages
int n = reader.getNumberOfPages();
//step 1: creation of a document-object
Rectangle rect = reader.getPageSizeWithRotation(1);
if (sens == ANTI_CLOCKWISE || sens == CLOCKWISE)
rect=rect.rotate();
Document document = new Document(rect);
//step 2: we create a writer that listens to the document
PdfWriter writer = PdfWriter.getInstance(document, fos);
//step 3: we open the document
document.open();
PdfContentByte cb = writer.getDirectContent();
PdfImportedPage page;
//Calcule values for the matrix
//http://itextdocs.lowagie.com/tutorial/directcontent/coordinates/index.html#transform
double angle = Math.PI; //Math.sin/cos want in radians
switch(pAngle) {
case 90: angle = Math.PI*90/180; break;
case 180: angle = Math.PI*180/180; break;
case 270: angle = Math.PI*270/180; break;
}
float a=(float) Math.cos(angle);
float b=(float) Math.sin(angle);
float c=(float) -Math.sin(angle);
float d=(float) Math.cos(angle);
//step 4: we add content
for (int i = 1; i <= n; i++) {
rect = reader.getPageSizeWithRotation(i);
if (pAngle == 90 || pAngle == 270)
rect= rect.rotate();
document.setPageSize(rect);
document.newPage();
page = writer.getImportedPage(reader, i);
cb.addTemplate(page, a, b, c, d, rect.width(), rect.height());
System.out.println("Processed page " + i);
}
//step 5: we close the document
document.close();
Your help will be appreciated !
--
Sylvain Machefert
http://iubito.free.fr
http://tousauxbalkans.jexiste.fr
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