Thanks Mark, I started into implementing #3 just before getting your
reply, thanks for all the input though,
-John
Date: Tue, 17 Oct 2006 13:42:21 -0700
From: "Mark Storer" <[EMAIL PROTECTED]>
Subject: Re: [iText-questions] Document coordinate system
To: "Post all your questions about iText here"
<[email protected]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
Several things come to mind:
1)
Use a PdfGraphics2D from your PdfContentByte. Java's "Graphics"
classes use the same sort of coordinate system, and PdfGraphics2D
irons out all that for you.
Warning: PdfGraphics2D isn't terribly efficient... by necessity. It
takes some extra effort to iron out the differences between the
Graphics system and PDF.
2)
Use the same trick on the text matrix:
cb.beginText();
cb.setFont( font, pointsize );
for (...) {
cb.setTextMatrix( textX, textY );
cb.saveState();
cb.setTextMatrix( 1, 0, 0, -1, 0, textFont.getAscentPoint(text, fontSize) );
cb.showText( text );
cb.restoreState();
}
cb.endText();
I believe this will work, but it's just off the top of my head. My
matrix-related code generally needs a few iterations before it'll
behave properly... Caveat Coedor.
3)
Recalculate your coordinates /for everything/ in advance. Just change
all your Y coordinates to "pageHeight - origY" when calling the
various PdfContentByte functions. Your rectangles and bounding boxes
will all end up with negative heights... so you may have to
"normalize" them.
I recommend #3. That's what LiquidOffice does.
4)
Start off with PDF's coordinate system so you don't have to mess
around with all this stuff.
:\
--Mark Storer
Senior Software Engineer
Cardiff.com
#include <disclaimer>
typedef std::Disclaimer<Cardiff> DisCard;
On 10/17/06, John Duff <[EMAIL PROTECTED]> wrote:
> I'm trying to print some objects I have, but the work on a coordinate
> system that starts in the upper left, not lower left as the pdfWriter
> does by default. I've looked at the docs and there is an example of
> inverting the coordinates:
>
>
>
> PdfContentByte cb = writer.getDirectContent();
> cb.concatCTM(1f, 0f, 0f, -1f, 0f, PageSize.A4.height());
>
>
>
>
> However, this also inverts the text that is printed. Is there any way
> to invert the coordinates without inverting what is written to the
> pdf?
>
>
>
> Thanks,
>
>
>
> John
>
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