/*
* $Id$
*
* This code is part of the 'iText Tutorial'.
* You can find the complete tutorial at the following address:
* http://itextdocs.lowagie.com/tutorial/
*
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* itext-questions@lists.sourceforge.net
*/
package com.lowagie.examples.directcontent.colors;
import java.awt.Color;
import java.io.FileOutputStream;
import com.lowagie.text.LwgDocument;
import com.lowagie.text.LwgElement;
import com.lowagie.text.LwgPageSize;
import com.lowagie.text.LwgPhrase;
import com.lowagie.text.pdf.ColumnText;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfTransparencyGroup;
import com.lowagie.text.pdf.PdfWriter;
/**
* Demonstrates transparency and images.
*/
public class Transparency {
/**
* Prints a square and fills half of it with a gray rectangle.
* @param x
* @param y
* @param cb
* @throws Exception
*/
public static void pictureBackdrop(float x, float y, PdfContentByte cb) throws Exception {
cb.setColorStroke(Color.black);
cb.setColorFill(Color.gray);
cb.rectangle(x, y, 100, 200);
cb.fill();
cb.setLineWidth(2);
cb.rectangle(x, y, 200, 200);
cb.stroke();
}
/**
* Prints 3 circles in different colors that intersect with eachother.
* @param x
* @param y
* @param cb
* @throws Exception
*/
public static void pictureCircles(float x, float y, PdfContentByte cb) throws Exception {
cb.setColorFill(Color.red);
cb.circle(x + 70, y + 70, 50);
cb.fill();
cb.setColorFill(Color.yellow);
cb.circle(x + 100, y + 130, 50);
cb.fill();
cb.setColorFill(Color.blue);
cb.circle(x + 130, y + 70, 50);
cb.fill();
}
/**
* Demonstrates the Transparency functionality.
* @param args no arguments needed
*/
public static void main(String[] args) {
System.out.println("Transparency");
// step 1: creation of a document-object
LwgDocument document = new LwgDocument(LwgPageSize.A4, 50, 50, 50, 50);
try {
// step 2: creation of a writer
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("transparency.pdf"));
// step 3: we open the document
document.open();
// step 4: content
PdfContentByte cb = writer.getDirectContent();
float gap = (document.getPageSize().getWidth() - 400) / 3;
pictureBackdrop(gap, 500, cb);
pictureBackdrop(200 + 2 * gap, 500, cb);
pictureBackdrop(gap, 500 - 200 - gap, cb);
pictureBackdrop(200 + 2 * gap, 500 - 200 - gap, cb);
pictureCircles(gap, 500, cb);
cb.saveState();
PdfGState gs1 = new PdfGState();
gs1.setFillOpacity(0.5f);
cb.setGState(gs1);
pictureCircles(200 + 2 * gap, 500, cb);
cb.restoreState();
PdfTemplate tp = cb.createTemplate(200, 200);
cb.saveState();
pictureCircles(0, 0, tp);
PdfTransparencyGroup group = new PdfTransparencyGroup();
tp.setGroup(group);
tp.sanityCheck();
cb.setGState(gs1);
cb.addTemplate(tp, gap, 500 - 200 - gap);
cb.restoreState();
tp = cb.createTemplate(200, 200);
cb.saveState();
PdfGState gs2 = new PdfGState();
gs2.setFillOpacity(0.5f);
gs2.setBlendMode(PdfGState.BM_SOFTLIGHT);
tp.setGState(gs2);
tp.sanityCheck();
pictureCircles(0, 0, tp);
tp.setGroup(group);
cb.addTemplate(tp, 200 + 2 * gap, 500 - 200 - gap);
cb.restoreState();
cb.resetRGBColorFill();
ColumnText ct = new ColumnText(cb);
LwgPhrase ph = new LwgPhrase("Ungrouped objects\nObject opacity = 1.0");
ct.setSimpleColumn(ph, gap, 0, gap + 200, 500, 18, LwgElement.ALIGN_CENTER);
ct.go();
ph = new LwgPhrase("Ungrouped objects\nObject opacity = 0.5");
ct.setSimpleColumn(ph, 200 + 2 * gap, 0, 200 + 2 * gap + 200, 500, 18, LwgElement.ALIGN_CENTER);
ct.go();
ph = new LwgPhrase("Transparency group\nObject opacity = 1.0\nGroup opacity = 0.5\nBlend mode = Normal");
ct.setSimpleColumn(ph, gap, 0, gap + 200, 500 - 200 - gap, 18, LwgElement.ALIGN_CENTER);
ct.go();
ph = new LwgPhrase("Transparency group\nObject opacity = 0.5\nGroup opacity = 1.0\nBlend mode = SoftLight");
ct.setSimpleColumn(ph, 200 + 2 * gap, 0, 200 + 2 * gap + 200, 500 - 200 - gap, 18, LwgElement.ALIGN_CENTER);
ct.go();
cb.sanityCheck();
}
catch (Exception de) {
de.printStackTrace();
}
// step 5: we close the document
document.close();
}
}