The pages has both media and crop boxes.
Media Box (the "normal" one): 0, 0, 595, 842
Crop Box (clips the media box): 0, 24, 595, 817
Odd, but perfectly legal. 8.26" x 11.01". Might make more sense in
metric, dunno.
Anyway, the visible page depends entirely on the CROP box. The default
value of the crop box if it isn't present is the media box.
Never assume the lower left corner is 0,0, even when there's no media
box. It's perfectly legal to put 0,0 in the center of the page, or sail
off into the furthest reaches of the coordinate system if you're so
inclined. [-200, -250, 200, 250] is perfectly legal, as is [1000, 1000,
1595, 1817], just to pull some examples out of thin air.
Moral: Check the crop box's lower left corner.
Oh, and don't forget that page's can be rotated too. That's always fun.
--Mark Storer
Senior Software Engineer
Cardiff.com
import legalese.Disclaimer;
Disclaimer<Cardiff> DisCard = null;
________________________________
From: Chip Whitmer [mailto:[email protected]]
Sent: Tuesday, March 22, 2011 1:19 PM
To: Post all your questions about iText
here([email protected])
Subject: [iText-questions] Mismatch between coordinates and
viewable text
I'm using iText-5.0.2 for Java. I have attached the original and
result for a PDF document that was modified using PdfStamper. In the
lower-left corner of each page, you can see a series of coordinates
displayed.
The code is simple:
PdfContentByte page =
stamper.getOverContent( pageNum );
page.beginText();
for( int i = 0 ; i < 100 ; i +=
10)
{
page.showTextAligned( Element.ALIGN_LEFT, "[" + i + "," + i + "]", i, i,
0 );
}
page.endText();
Note that the first coordinates that you can see in the
lower-left are [20, 20] (and you can see only the top half of this
string). Apparently the text written at [0, 0] and [10, 10] is actually
being written outside of the page boundaries.
I thought [0, 0] was the "origin" for the drawing grid - the
point at the bottom-left corner of the page. But if this is true, then I
would expect text written at [0, 0] to be visible.
If [0, 0] is not the viewable origin, then how can I know what
value to use for the Y-coordinate, to ensure that the resulting text
visible on the page?
Thanks,
-Chip Whitmer
Service Repair Solutions, Inc.
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