Gérard KESTER wrote:
Auriez vous oublié de décaler la deuxième
page, par hasard ?
I had no idea why you needed that offset, so I removed it.
I just wanted to make my point:
1 page = 1 Graphics2D instance.
DO NOT REUSE THE SAME g2d FOR EVERY PAGE!
Create a new instance.
Pour les autres propositions
Have a look at the following three examples:
http://1t3xt.info/examples/browse/?page=toc&id=369
The way I see it, you want to create a genealogical tree that
spans multiple pages, but you are making it very difficult for
yourself. (Why???)
Suppose we have to draw a rectangle and a circle on a canvas
that measures 200 x 200 pts. However, our page size is only
100 x 100 pts. How are we going to achieve this?
I've mixed two solutions in this example:
http://1t3xt.info/examples/browse/?page=example&id=367
For the rectangle, I used the 'difficult way' (I think that's
the way you are trying to do it).
For the circle, I used the 'proper way' (which is incidentally
the easiest way).
Let's split the example in two. The following example draw the
rectangle: http://1t3xt.info/examples/browse/?page=example&id=368
As you can see I create a new Graphics2D instance for every page:
g2d = directContent.createGraphicsShapes(100, 100);
Note that for reasons of simplicity, I didn't use AffineTransform,
I just calculated the new offsets (you're free to adapt the
example if necessary). Point is that you have to RECREATE THE
GRAPHICS STATE for every page. Personally, I don't like this approach.
I'd never do it this way. I'd do it like this:
http://1t3xt.info/examples/browse/?page=example&id=369
I create a PdfTemplate with the size of the complete canvas:
PdfContentByte directContent = writer.getDirectContentUnder();
PdfTemplate canvas = directContent.createTemplate(200, 200);
Graphics2D g2d = canvas.createGraphicsShapes(200, 200);
Then I'd draw the content (in this case a circle):
g2d.setPaint(new Color(150,150,255));
g2d.setStroke(new BasicStroke(10.0f));
g2d.drawArc(50, 50, 100, 100, 0, 360);
Maybe I'd even wrap the canvas inside an image (that's not mandatory,
but it makes the math easier). Once this is done, I add the large
canvas to the smaller pages multiple times using different offsets:
img.setAbsolutePosition(0, -100);
document.add(img);
document.newPage();
img.setAbsolutePosition(-100, -100);
document.add(img);
document.newPage();
img.setAbsolutePosition(0, 0);
document.add(img);
document.newPage();
img.setAbsolutePosition(-100, 0);
document.add(img);
I hope this is more or less what you need, but please understand
that I made these examples based on assumptions. You didn't really
explain what you needed.
There's even a third solution. Bill Segraves made an application
called ScaleAndTile (Google will help you find it). It is used
to 'cut' a large PDF into 'manageable pages'. You could create
your tree on one giant page, then afterwards use functionality
as written by Bill to distribute the huge tree over different pages.
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