First, I'd like to say well done on producing "iText".
Your project is very welcome.
I'm struggling with how to create a very simple
PDF that has 2 layers with the top layer having
a simple transparent 'cut-out' area.
I've got a small code snippet based on one of your
examples. (code included at end of this email)
In summary what I am trying to do is paint a
transparent area on the top layer - to create a cut-out -
so that what is painted on the lower layer is revealed
and shows through this area.
What I find is that any stroke or fill that I do with
a supposedly transparent color (i.e. an instance of
java.awt.Color with an alpha channel mask of 0x00)
does not create a cut-out area on the top layer.
The code in my example paints:
- a large blue square on the bottom layer,
- a slightly smaller yellow square in the same position on the top layer,
- and then paints a diagonal cross (X) from corner to corner
in the transparent colour.
The PDF that my example code generates should ideally
show a blue border around a yellow square
with a blue diagonal cross (X) from corner
to corner of the yellow square.
Instead it shows a blue border with a yellow square,
with a white diagnoal cross.
The transparent colour being "java.awt.Color(0xff, 0xff, 0xff, 0);"
I've got a copy of your "iText" book
so if you were to point me to a page that might help,
that would be great.
Any tips that you have would be much appreciated.
Kind Regards,
Steven Bishop
software configuration is:
iText.jar : tested with versions 2.0.4 and 2.0.8
JVM : Sun jdk1.6.0_01
--- Begin Included File ---
public class CutOut
{
public static void main(String[] args)
{
System.out.println("CutOut");
com.lowagie.text.Document theDocument = new
com.lowagie.text.Document(com.lowagie.text.PageSize.A4, 50, 50, 50, 50);
try {
com.lowagie.text.pdf.PdfWriter theWriter =
com.lowagie.text.pdf.PdfWriter.getInstance(theDocument, new
java.io.FileOutputStream("cutout.pdf"));
theWriter.setPdfVersion(com.lowagie.text.pdf.PdfWriter.VERSION_1_5);
theDocument.open();
com.lowagie.text.pdf.PdfLayer layer1 = new
com.lowagie.text.pdf.PdfLayer("Layer 1", theWriter);
com.lowagie.text.pdf.PdfLayer layer2 = new
com.lowagie.text.pdf.PdfLayer("Layer 2", theWriter);
com.lowagie.text.pdf.PdfContentByte cb =
theWriter.getDirectContent();
// Layer1...
//
cb.beginLayer(layer1);
cb.setColorFill(java.awt.Color.blue);
cb.rectangle(130, 130, 220, 220);
cb.fill();
cb.endLayer();
// Layer2...
//
cb.beginLayer(layer2);
cb.setColorStroke(java.awt.Color.yellow);
cb.setColorFill(java.awt.Color.yellow);
cb.rectangle(140, 140, 200, 200);
cb.fill();
java.awt.Color theTransparentColour = new java.awt.Color(0xff,
0xff, 0xff, 0x00);
System.err.println("TransparentColour : Alpha =
"+theTransparentColour.getAlpha());
cb.setLineWidth(16);
cb.setColorStroke(theTransparentColour);
cb.setColorFill(theTransparentColour);
cb.moveTo(140, 140);
cb.lineTo(340, 340);
cb.stroke();
cb.moveTo(140, 340);
cb.lineTo(340, 140);
cb.stroke();
cb.endLayer();
}
catch (Exception dex)
{
dex.printStackTrace();
}
theDocument.close();
}
}
--- End Included File ---
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