/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.examples.util;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.exceptions.InvalidPasswordException;
import org.apache.pdfbox.exceptions.WrappedIOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.graphics.PDGraphicsState;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;
import org.apache.pdfbox.util.Matrix;
import org.apache.pdfbox.util.PDFOperator;
import org.apache.pdfbox.util.PDFStreamEngine;
import org.apache.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.apache.pdfbox.examples.util.PrintImageLocations <input-pdf>
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.5 $
*/
public class PrintImageLocations extends PDFStreamEngine
{
private static final String INVOKE_OPERATOR = "Do";
/**
* Default constructor.
*
* @throws IOException If there is an error loading text stripper properties.
*/
public PrintImageLocations() throws IOException
{
super( ResourceLoader.loadProperties(
"org/apache/pdfbox/resources/PDFTextStripper.properties", true ) );
}
/**
* 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( INVOKE_OPERATOR.equals(operation) )
{
COSName objectName = (COSName)arguments.get( 0 );
Map<String, PDXObject> xobjects = getResources().getXObjects();
PDXObject xobject = (PDXObject)xobjects.get( objectName.getName() );
if( xobject instanceof PDXObjectImage )
{
PDXObjectImage image = (PDXObjectImage)xobject;
PDPage page = getCurrentPage();
int imageWidth = image.getWidth();
int imageHeight = image.getHeight();
double pageHeight = page.getMediaBox().getHeight();
System.out.println("*******************************************************************");
System.out.println("Found image [" + objectName.getName() + "]");
Matrix ctmNew = getGraphicsState().getCurrentTransformationMatrix();
float yScaling = ctmNew.getYScale();
float angle = (float)Math.acos(ctmNew.getValue(0, 0)/ctmNew.getXScale());
if (ctmNew.getValue(0, 1) < 0 && ctmNew.getValue(1, 0) > 0)
{
angle = (-1)*angle;
}
ctmNew.setValue(2, 1, (float)(pageHeight - ctmNew.getYPosition() - Math.cos(angle)*yScaling));
ctmNew.setValue(2, 0, (float)(ctmNew.getXPosition() - Math.sin(angle)*yScaling));
// because of the moved 0,0-reference, we have to shear in the opposite direction
ctmNew.setValue(0, 1, (-1)*ctmNew.getValue(0, 1));
ctmNew.setValue(1, 0, (-1)*ctmNew.getValue(1, 0));
AffineTransform ctmAT = ctmNew.createAffineTransform();
ctmAT.scale(1f/imageWidth, 1f/imageHeight);
float imageXScale = ctmNew.getXScale();
float imageYScale = ctmNew.getYScale();
System.out.println("position = " + ctmNew.getXPosition() + ", " + ctmNew.getYPosition());
// size in pixel
System.out.println("size = " + imageWidth + "px, " + imageHeight + "px");
// size in page units
System.out.println("size = " + imageXScale + ", " + imageYScale);
// size in inches
imageXScale /= 72;
imageYScale /= 72;
System.out.println("size = " + imageXScale + "in, " + imageYScale + "in");
// size in millimeter
imageXScale *= 25.4;
imageYScale *= 25.4;
System.out.println("size = " + imageXScale + "mm, " + imageYScale + "mm");
System.out.println();
}
else if(xobject instanceof PDXObjectForm)
{
// save the graphics state
getGraphicsStack().push( (PDGraphicsState)getGraphicsState().clone() );
PDPage page = getCurrentPage();
PDXObjectForm form = (PDXObjectForm)xobject;
COSStream invoke = (COSStream)form.getCOSObject();
PDResources pdResources = form.getResources();
if(pdResources == null)
{
pdResources = page.findResources();
}
// if there is an optional form matrix, we have to
// map the form space to the user space
Matrix matrix = form.getMatrix();
if (matrix != null)
{
Matrix xobjectCTM = matrix.multiply( getGraphicsState().getCurrentTransformationMatrix());
getGraphicsState().setCurrentTransformationMatrix(xobjectCTM);
}
processSubStream( page, pdResources, invoke );
// restore the graphics state
setGraphicsState( (PDGraphicsState)getGraphicsStack().pop() );
}
}
else
{
super.processOperator( operator, arguments );
}
}
/**
* This will print the usage for this document.
*/
private static void usage()
{
System.err.println( "Usage: java org.apache.pdfbox.examples.pdmodel.PrintImageLocations <input-pdf>" );
}
}