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package org.pdfbox.examples.util;
import org.pdfbox.cos.COSName;
import org.pdfbox.exceptions.InvalidPasswordException;
import org.pdfbox.exceptions.WrappedIOException;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDPage;
import org.pdfbox.pdmodel.graphics.xobject.PDXObject;
import org.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;
import org.pdfbox.util.Matrix;
import org.pdfbox.util.PDFOperator;
import org.pdfbox.util.PDFStreamEngine;
import org.pdfbox.util.ResourceLoader;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
* This is an example on how to get the x/y coordinates of image locations.
*
* Usage: java org.pdfbox.examples.util.PrintImageLocations <input-pdf>
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.3 $
*/
public class PrintImageLocations extends PDFStreamEngine
{
/**
* Default constructor.
*
* @throws IOException If there is an error loading text stripper properties.
*/
public PrintImageLocations() throws IOException
{
super( ResourceLoader.loadProperties( "Resources/PDFTextStripper.properties" ) );
}
/**
* This will print the documents data.
*
* @param args The command line arguments.
*
* @throws Exception If there is an error parsing the document.
*/
public static void main( String[] args ) throws Exception
{
if( args.length != 1 )
{
usage();
}
else
{
PDDocument document = null;
try
{
document = PDDocument.load( args[0] );
if( document.isEncrypted() )
{
try
{
document.decrypt( "" );
}
catch( InvalidPasswordException e )
{
System.err.println( "Error: Document is encrypted with a password." );
System.exit( 1 );
}
}
PrintImageLocations printer = new PrintImageLocations();
List allPages = document.getDocumentCatalog().getAllPages();
for( int i=0; i<allPages.size(); i++ )
{
PDPage page = (PDPage)allPages.get( i );
System.out.println( "Processing page: " + i );
printer.processStream( page, page.findResources(), page.getContents().getStream() );
}
}
finally
{
if( document != null )
{
document.close();
}
}
}
}
/**
* This is used to handle an operation.
*
* @param operator The operation to perform.
* @param arguments The list of arguments.
*
* @throws IOException If there is an error processing the operation.
*/
protected void processOperator( PDFOperator operator, List arguments ) throws IOException
{
String operation = operator.getOperation();
if( operation.equals( "Do" ) )
{
COSName objectName = (COSName)arguments.get( 0 );
Map xobjects = getResources().getXObjects();
PDXObject xobject = (PDXObject)xobjects.get( objectName.getName() );
if( xobject instanceof PDXObjectImage )
{
try
{
PDPage page = getCurrentPage();
Matrix ctm = getGraphicsState().getCurrentTransformationMatrix();
double rotationInRadians =(page.findRotation() * Math.PI)/180;
AffineTransform rotation = new AffineTransform();
rotation.setToRotation( rotationInRadians );
AffineTransform rotationInverse = rotation.createInverse();
Matrix rotationInverseMatrix = new Matrix();
rotationInverseMatrix.setFromAffineTransform( rotationInverse );
Matrix rotationMatrix = new Matrix();
rotationMatrix.setFromAffineTransform( rotation );
Matrix unrotatedCTM = ctm.multiply( rotationInverseMatrix );
System.out.println( "Found image[" + objectName.getName() + "] " +
"at " + unrotatedCTM.getXPosition() + "," + unrotatedCTM.getYPosition() );
}
catch( NoninvertibleTransformException e )
{
throw new WrappedIOException( e );
}
}
}
else
{
super.processOperator( operator, arguments );
}
}
/**
* This will print the usage for this document.
*/
private static void usage()
{
System.err.println( "Usage: java org.pdfbox.examples.pdmodel.PrintImageLocations <input-pdf>" );
}
}