/*
* $Id: Watermarker.java 45 2007-05-15 22:02:53Z chammer $
* Copyright (c) 2005-2007 Bruno Lowagie, Carsten Hammer
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* This class was originally published under the MPL by Bruno Lowagie
* and Carsten Hammer.
* It was a part of iText, a Java-PDF library. You can now use it under
* the MIT License; for backward compatibility you can also use it under
* the MPL version 1.1: http://www.mozilla.org/MPL/
* A copy of the MPL license is bundled with the source code FYI.
*/
package com.lowagie.tools.plugins;
import java.io.File;
import java.io.FileOutputStream;
import javax.swing.JInternalFrame;
import javax.swing.JOptionPane;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.tools.AbstractTool;
import com.lowagie.tools.arguments.FileArgument;
import com.lowagie.tools.arguments.StringArgument;
import com.lowagie.tools.arguments.filters.PdfFilter;
/**
* This tool lets you add a text watermark to all pages of a document.
*/
public class Watermarker
extends AbstractTool {
static {
addVersion("$Id: Watermarker.java 45 2007-05-15 22:02:53Z chammer $");
}
FileArgument destfile = null;
/**
* This tool lets you add a text watermark to all pages of a document.
*/
public Watermarker() {
super();
FileArgument inputfile = new FileArgument(this, "srcfile",
"The file you want to watermark", false,
new PdfFilter());
arguments.add(inputfile);
arguments.add(new StringArgument(this, "watermark",
"The text that can be used as watermark",
String.class.getName()));
arguments.add(new StringArgument(this, "fontsize",
"The fontsize of the watermark text",
String.class.getName()));
arguments.add(new StringArgument(this, "opacity",
"The opacity of the watermark text",
String.class.getName()));
destfile = new FileArgument(this, "destfile",
"The file to which the watermarked PDF has to be written",
true, new PdfFilter());
arguments.add(destfile);
inputfile.addPropertyChangeListener(destfile);
}
/**
* Creates the internal frame.
*/
protected void createFrame() {
internalFrame = new JInternalFrame("Watermark", true, false, true);
internalFrame.setSize(300, 80);
internalFrame.setJMenuBar(getMenubar());
System.out.println("=== Watermark OPENED ===");
}
/**
* Executes the tool (in most cases this generates a PDF file).
*/
public void execute() {
try {
if (getValue("srcfile") == null) {
throw new InstantiationException(
"You need to choose a sourcefile");
}
if (getValue("destfile") == null) {
throw new InstantiationException(
"You need to choose a destination file");
}
if (getValue("watermark") == null) {
throw new InstantiationException(
"You need to add a text for the watermark");
}
int fontsize = Integer.parseInt( (String) getValue("fontsize"));
float opacity = Float.parseFloat( (String) getValue("opacity"));
BaseFont bf = BaseFont.createFont("Helvetica", BaseFont.WINANSI,
false);
PdfReader reader = new PdfReader( ( (File) getValue("srcfile"))
.getAbsolutePath());
int pagecount = reader.getNumberOfPages();
PdfGState gs1 = new PdfGState();
gs1.setFillOpacity(opacity);
String text = (String) getValue("watermark");
PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(
(File) getValue("destfile")));
float txtwidth = bf.getWidthPoint(text, fontsize);
for (int i = 1; i <= pagecount; i++) {
PdfContentByte seitex = stamp.getOverContent(i);
Rectangle recc = reader.getCropBox(i);
float winkel = (float) Math.atan(recc.height() / recc.width());
float m1 = (float) Math.cos(winkel);
float m2 = (float) - Math.sin(winkel);
float m3 = (float) Math.sin(winkel);
float m4 = (float) Math.cos(winkel);
float xoff = (float) ( -Math.cos(winkel) * txtwidth / 2 - Math
.sin(winkel)
* fontsize / 2);
float yoff = (float) (Math.sin(winkel) * txtwidth / 2 - Math
.cos(winkel)
* fontsize / 2);
seitex.saveState();
seitex.setGState(gs1);
seitex.beginText();
seitex.setFontAndSize(bf, fontsize);
seitex.setTextMatrix(m1, m2, m3, m4, xoff + recc.width() / 2,
yoff + recc.height() / 2);
seitex.showText(text);
seitex.endText();
seitex.restoreState();
}
stamp.close();
}
catch (Exception e) {
JOptionPane.showMessageDialog(internalFrame, e.getMessage(), e
.getClass().getName(),
JOptionPane.ERROR_MESSAGE);
System.err.println(e.getMessage());
}
}
/**
* Gets the PDF file that should be generated (or null if the output isn't a
* PDF file).
*
* @return the PDF file that should be generated
* @throws InstantiationException
*/
protected File getDestPathPDF() throws InstantiationException {
return (File) getValue("destfile");
}
/**
* Indicates that the value of an argument has changed.
*
* @param arg
* the argument that has changed
*/
public void valueHasChanged(StringArgument arg) {
if (internalFrame == null) {
// if the internal frame is null, the tool was called from the
// commandline
return;
}
if (destfile.getValue() == null && arg.getName().equalsIgnoreCase("srcfile")) {
String filename = arg.getValue();
String filenameout = filename.substring(0, filename.indexOf(".",
filename.length() - 4)) + "_out.pdf";
destfile.setValue(filenameout);
}
}
/**
* This methods helps you running this tool as a standalone application.
*
* <p>Call it like this from commandline:
* java com.lowagie.tools.plugins.Watermarker input.pdf Draft 230 0.2 output.pdf
*
* <p>"input.pdf" is the input file name to be processed
* <p>"Draft" is the text written as transparent "watermark" on top of each page
* <p>"230" is the font size
* <p>"0.2" is the opacity (1.0 completely opaque, 0.0 completely transparent)
* <p>"output.pdf" is the output file name
*
* <p>Call it from within other Java code:
*
* <p>Watermarker.main(new String[]{"input.pdf","Draft","230","0.2","output.pdf"});
*
* @param args the srcfile, watermark text and destfile
*/
public static void main(String[] args) {
Watermarker watermarker = new Watermarker();
if (args.length != 5) {
System.err.println(watermarker.getUsage());
}
watermarker.setMainArguments(args);
watermarker.execute();
}
}