1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.pdfbox.examples.util;
18
19 import org.apache.pdfbox.cos.COSName;
20 import org.apache.pdfbox.exceptions.InvalidPasswordException;
21 import org.apache.pdfbox.exceptions.WrappedIOException;
22
23 import org.apache.pdfbox.pdmodel.PDDocument;
24 import org.apache.pdfbox.pdmodel.PDPage;
25 import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject;
26 import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;
27 import org.apache.pdfbox.util.Matrix;
28 import org.apache.pdfbox.util.PDFOperator;
29 import org.apache.pdfbox.util.PDFStreamEngine;
30 import org.apache.pdfbox.util.ResourceLoader;
31
32 import java.awt.geom.AffineTransform;
33 import java.awt.geom.NoninvertibleTransformException;
34 import java.io.IOException;
35
36 import java.util.List;
37 import java.util.Map;
38
39 /**
40 * This is an example on how to get the x/y coordinates of image locations.
41 *
42 * Usage: java org.apache.pdfbox.examples.util.PrintImageLocations <input-pdf>
43 *
44 * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
45 * @version $Revision: 1.5 $
46 */
47 public class PrintImageLocations extends PDFStreamEngine
48 {
49 /**
50 * Default constructor.
51 *
52 * @throws IOException If there is an error loading text stripper properties.
53 */
54 public PrintImageLocations() throws IOException
55 {
56 super( ResourceLoader.loadProperties( "Resources/PDFTextStripper.properties", true ) );
57 }
58
59 /**
60 * This will print the documents data.
61 *
62 * @param args The command line arguments.
63 *
64 * @throws Exception If there is an error parsing the document.
65 */
66 public static void main( String[] args ) throws Exception
67 {
68 if( args.length != 1 )
69 {
70 usage();
71 }
72 else
73 {
74 PDDocument document = null;
75 try
76 {
77 document = PDDocument.load( args[0] );
78 if( document.isEncrypted() )
79 {
80 try
81 {
82 document.decrypt( "" );
83 }
84 catch( InvalidPasswordException e )
85 {
86 System.err.println( "Error: Document is encrypted with a password." );
87 System.exit( 1 );
88 }
89 }
90 PrintImageLocations printer = new PrintImageLocations();
91 List allPages = document.getDocumentCatalog().getAllPages();
92 for( int i=0; i<allPages.size(); i++ )
93 {
94 PDPage page = (PDPage)allPages.get( i );
95 System.out.println( "Processing page: " + i );
96 printer.processStream( page, page.findResources(), page.getContents().getStream() );
97 }
98 }
99 finally
100 {
101 if( document != null )
102 {
103 document.close();
104 }
105 }
106 }
107 }
108
109 /**
110 * This is used to handle an operation.
111 *
112 * @param operator The operation to perform.
113 * @param arguments The list of arguments.
114 *
115 * @throws IOException If there is an error processing the operation.
116 */
117 protected void processOperator( PDFOperator operator, List arguments ) throws IOException
118 {
119 String operation = operator.getOperation();
120 if( operation.equals( "Do" ) )
121 {
122 COSName objectName = (COSName)arguments.get( 0 );
123 Map xobjects = getResources().getXObjects();
124 PDXObject xobject = (PDXObject)xobjects.get( objectName.getName() );
125 if( xobject instanceof PDXObjectImage )
126 {
127 try
128 {
129 PDXObjectImage image = (PDXObjectImage)xobject;
130 PDPage page = getCurrentPage();
131 Matrix ctm = getGraphicsState().getCurrentTransformationMatrix();
132 double rotationInRadians =(page.findRotation() * Math.PI)/180;
133
134
135 AffineTransform rotation = new AffineTransform();
136 rotation.setToRotation( rotationInRadians );
137 AffineTransform rotationInverse = rotation.createInverse();
138 Matrix rotationInverseMatrix = new Matrix();
139 rotationInverseMatrix.setFromAffineTransform( rotationInverse );
140 Matrix rotationMatrix = new Matrix();
141 rotationMatrix.setFromAffineTransform( rotation );
142
143 Matrix unrotatedCTM = ctm.multiply( rotationInverseMatrix );
144 float xScale = unrotatedCTM.getXScale();
145 float yScale = unrotatedCTM.getYScale();
146
147 System.out.println( "Found image[" + objectName.getName() + "] " +
148 "at " + unrotatedCTM.getXPosition() + "," + unrotatedCTM.getYPosition() +
149 " size=" + (xScale/100f*image.getWidth()) + "," + (yScale/100f*image.getHeight() ));
150 }
151 catch( NoninvertibleTransformException e )
152 {
153 throw new WrappedIOException( e );
154 }
155 }
156 }
157 else
158 {
159 super.processOperator( operator, arguments );
160 }
161 }
162
163 /**
164 * This will print the usage for this document.
165 */
166 private static void usage()
167 {
168 System.err.println( "Usage: java org.apache.pdfbox.examples.pdmodel.PrintImageLocations <input-pdf>" );
169 }
170
171 }