Rotate all pages by a given angle 2006-08-24 - By Sylvain Machefert
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Hi !
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
Hi !<br><br>I want to rotate all pages of a given PDF by 90, 180 or 270 degrees
.<br>I read the page about matrices <a href="http://itextdocs.lowagie.com
/tutorial/directcontent/coordinates/index.html#top">http://itextdocs.lowagie.com
/tutorial/directcontent/coordinates/index.html#top
</a> and try understand the matrix<br> [ a, b, 0<br>
c, d, 0<br> e, f, 1 ]<br clear="all">[ sX * Math.cos
(angle), sY * Math.sin(angle), 0 <br>-sX * Math.sin(angle), sY * Math.cos(angle)
, 0<br>tX, tY, 1 ]<br>What s, t, X and Y stand for ?
<br><br>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 :(
<br>Can you help me ?<br>What are the value for the 3 angles ?<br> <br
>pAngle is my parameter 90, 180 or 270 degrees <br><br> FileOutputStream
fos = new FileOutputStream(tmp);<br><br> //we create a reader for a certain
document
<br> PdfReader reader = new PdfReader(sourcepdfbytes[]);<br> //we retrieve
the total number of pages<br> int n = reader.getNumberOfPages();<br> <br>
//step 1: creation of a document-object<br> Rectangle rect =
reader.getPageSizeWithRotation(1);<br> if (sens == ANTI_CLOCKWISE || sens ==
CLOCKWISE)<br> rect=rect.rotate();<br> Document document = new Document
(rect);<br> <br> //step 2: we create a writer that listens to the document
<br> PdfWriter writer = PdfWriter.getInstance(document, fos);<br> //step 3:
we open the document<br> document.open();<br> PdfContentByte cb = writer
.getDirectContent();<br> PdfImportedPage page;<br><br> //Calcule values for
the matrix
<br> //http://itextdocs.lowagie.com/tutorial/directcontent/coordinates/index
.html#transform<br> double angle = Math.PI; //Math.sin/cos want in radians<br>
switch(pAngle) {<br> case 90: angle = Math.PI*90/180; break;
<br> case 180: angle = Math.PI*180/180; break;<br>  
;case 270: angle = Math.PI*270/180; break;<br> }<br> float a=(float) Math
.cos(angle);<br> float b=(float) Math.sin(angle);<br> float c=(float) -Math
.sin(angle);
<br> float d=(float) Math.cos(angle);<br> <br> //step 4: we add content
<br> for (int i = 1; i <= n; i++) {<br> rect = reader
.getPageSizeWithRotation(i);<br> if (pAngle == 90 || pAngle ==
270)<br> rect=
rect.rotate();<br> document.setPageSize(rect);<br>
document.newPage();<br> page = writer.getImportedPage
(reader, i);<br><br> cb.addTemplate(page, a, b, c, d, rect.width(
), rect.height());<br> <br>
System.out.println("Processed page " + i);<br> }<br> //step 5: we
close the document<br> document.close();<br> <br> Your help will
be appreciated !<br><br>-- <br>Sylvain Machefert<br><a href="http://iubito.free
.fr">
http://iubito.free.fr</a><br><a href="http://tousauxbalkans.jexiste.fr">http:/
/tousauxbalkans.jexiste.fr</a>
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