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HSSFPicture.resize() - a handy method to reset a picture to its original width and height

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@581029 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2007-10-01 18:07:32 +00:00
parent d853ae3ece
commit 523c9ecabd
7 changed files with 242 additions and 11 deletions
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22
src/documentation/content/xdocs/hssf/quick-guide.xml
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@ -24,6 +24,7 @@
<title>Busy Developers' Guide to HSSF Features</title>
<authors>
<person email="user@poi.apache.org" name="Glen Stampoultzis" id="CO"/>
<person email="user@poi.apache.org" name="Yegor Kozlov" id="YK"/>
</authors>
</header>
<body>
@ -988,7 +989,26 @@
anchor.setAnchorType( 2 );
patriarch.createPicture(anchor, loadPicture( "src/resources/logos/logoKarmokar4.png", wb ));
</source>
<p>Reading images from a workbook:</p>
<p>Creating an image and setting its anchor to the actual width and height:</p>
<source>
HSSFPatriarch patriarch = sheet5.createDrawingPatriarch();
HSSFPicture picture = patriarch.createPicture(new HSSFClientAnchor(), loadPicture( "src/resources/logos/logoKarmokar4.png", wb ));
picture.resize();
</source>
<p>or</p>
<source>
HSSFPatriarch patriarch = sheet5.createDrawingPatriarch();
HSSFPicture picture = patriarch.createPicture(new HSSFClientAnchor(), loadPicture( "src/resources/logos/logoKarmokar4.png", wb ));
HSSFClientAnchor prefferedSize = picture.getPrefferedSize();
picture.setAnchor(prefferedSize);
</source>
<warning>
HSSFPicture.resize() works only for JPEG and PNG. Other formats are not yet supported.
</warning>
<p>Reading images from a workbook:</p>
<source>
HSSFWorkbook wb;

2
src/examples/src/org/apache/poi/hssf/usermodel/examples/OfficeDrawing.java
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@ -166,6 +166,8 @@ public class OfficeDrawing
anchor = new HSSFClientAnchor(0,0,1023,255,(short)6,2,(short)8,7);
anchor.setAnchorType( 2 );
HSSFPicture picture = patriarch.createPicture(anchor, loadPicture( "src/resources/logos/logoKarmokar4s.png", wb ));
//Reset the image to the original size.
picture.resize();
picture.setLineStyle( picture.LINESTYLE_DASHDOTGEL );
}

5
src/java/org/apache/poi/hssf/model/Workbook.java
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@ -2219,6 +2219,11 @@ public class Workbook implements Model
return windowOne;
}
public EscherBSERecord getBSERecord(int pictureIndex)
{
return (EscherBSERecord)escherBSERecords.get(pictureIndex-1);
}
public int addBSERecord(EscherBSERecord e)
{
createDrawingGroup();

1
src/java/org/apache/poi/hssf/usermodel/HSSFPatriarch.java
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@ -90,6 +90,7 @@ public class HSSFPatriarch
HSSFPicture shape = new HSSFPicture(null, anchor);
shape.setPictureIndex( pictureIndex );
shape.anchor = anchor;
shape.patriarch = this;
shapes.add(shape);
return shape;
}

138
src/java/org/apache/poi/hssf/usermodel/HSSFPicture.java
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@ -16,23 +16,40 @@
*/
package org.apache.poi.hssf.usermodel;
import org.apache.poi.ddf.EscherBSERecord;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.Iterator;
/**
* Represents a escher picture. Eg. A GIF, JPEG etc...
*
* @author Glen Stampoultzis
* @version $Id$
* @author Yegor Kozlov (yegor at apache.org)
*/
public class HSSFPicture
extends HSSFSimpleShape
{
public static final int PICTURE_TYPE_EMF = 0; // Windows Enhanced Metafile
public static final int PICTURE_TYPE_WMF = 1; // Windows Metafile
public static final int PICTURE_TYPE_PICT = 2; // Macintosh PICT
public static final int PICTURE_TYPE_JPEG = 3; // JFIF
public static final int PICTURE_TYPE_PNG = 4; // PNG
public static final int PICTURE_TYPE_DIB = 5; // Windows DIB
public static final int PICTURE_TYPE_EMF = HSSFWorkbook.PICTURE_TYPE_EMF; // Windows Enhanced Metafile
public static final int PICTURE_TYPE_WMF = HSSFWorkbook.PICTURE_TYPE_WMF; // Windows Metafile
public static final int PICTURE_TYPE_PICT = HSSFWorkbook.PICTURE_TYPE_PICT; // Macintosh PICT
public static final int PICTURE_TYPE_JPEG = HSSFWorkbook.PICTURE_TYPE_JPEG; // JFIF
public static final int PICTURE_TYPE_PNG = HSSFWorkbook.PICTURE_TYPE_PNG; // PNG
public static final int PICTURE_TYPE_DIB = HSSFWorkbook.PICTURE_TYPE_DIB; // Windows DIB
int pictureIndex;
HSSFPatriarch patriarch;
private static final POILogger log = POILogFactory.getLogger(HSSFPicture.class);
/**
* Constructs a picture object.
@ -52,4 +69,111 @@ public class HSSFPicture
{
this.pictureIndex = pictureIndex;
}
/**
* Reset the image to the original size.
*
* @since POI 3.0.2
*/
public void resize(){
HSSFClientAnchor anchor = (HSSFClientAnchor)getAnchor();
anchor.setAnchorType(2);
HSSFClientAnchor pref = getPrefferedSize();
int row2 = anchor.getRow1() + (pref.getRow2() - pref.getRow1());
int col2 = anchor.getCol1() + (pref.getCol2() - pref.getCol1());
anchor.setCol2((short)col2);
anchor.setDx1(0);
anchor.setDx2(pref.getDx2());
anchor.setRow2(row2);
anchor.setDy1(0);
anchor.setDy2(pref.getDy2());
}
/**
* Calculate the preffered size for this picture.
*
* @return HSSFClientAnchor with the preffered size for this image
* @since POI 3.0.2
*/
public HSSFClientAnchor getPrefferedSize(){
HSSFClientAnchor anchor = new HSSFClientAnchor();
EscherBSERecord bse = (EscherBSERecord)patriarch.sheet.book.getBSERecord(pictureIndex);
byte[] data = bse.getBlipRecord().getPicturedata();
int type = bse.getBlipTypeWin32();
switch (type){
//we can calculate the preffered size only for JPEG and PNG
//other formats like WMF, EMF and PICT are not supported in Java
case HSSFWorkbook.PICTURE_TYPE_JPEG:
case HSSFWorkbook.PICTURE_TYPE_PNG:
BufferedImage img = null;
ImageReader r = null;
try {
//read the image using javax.imageio.*
ImageInputStream iis = ImageIO.createImageInputStream( new ByteArrayInputStream(data) );
Iterator i = ImageIO.getImageReaders( iis );
r = (ImageReader) i.next();
r.setInput( iis );
img = r.read(0);
int[] dpi = getResolution(r);
int imgWidth = img.getWidth()*96/dpi[0];
int imgHeight = img.getHeight()*96/dpi[1];
//Excel measures cells in units of 1/256th of a character width.
//The cell width calculated based on this info is always "off".
//A better approach seems to be to use empirically obtained cell width and row height
int cellwidth = 64;
int rowheight = 17;
int col2 = imgWidth/cellwidth;
int row2 = imgHeight/rowheight;
int dx2 = (int)((float)(imgWidth % cellwidth)/cellwidth * 1024);
int dy2 = (int)((float)(imgHeight % rowheight)/rowheight * 256);
anchor.setCol2((short)col2);
anchor.setDx2(dx2);
anchor.setRow2(row2);
anchor.setDy2(dy2);
} catch (IOException e){
//silently return if ImageIO failed to read the image
log.log(POILogger.WARN, e);
img = null;
}
break;
}
return anchor;
}
/**
* The metadata of PNG and JPEG can contain the width of a pixel in millimeters.
* Return the the "effective" dpi calculated as <code>25.4/HorizontalPixelSize</code>
* and <code>25.4/VerticalPixelSize</code>. Where 25.4 is the number of mm in inch.
*
* @return array of two elements: <code>{horisontalPdi, verticalDpi}</code>.
* {96, 96} is the default.
*/
protected int[] getResolution(ImageReader r) throws IOException {
int hdpi=96, vdpi=96;
double mm2inch = 25.4;
NodeList lst;
Element node = (Element)r.getImageMetadata(0).getAsTree("javax_imageio_1.0");
lst = node.getElementsByTagName("HorizontalPixelSize");
if(lst != null && lst.getLength() == 1) hdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
lst = node.getElementsByTagName("VerticalPixelSize");
if(lst != null && lst.getLength() == 1) vdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
return new int[]{hdpi, vdpi};
}
}

4
src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java
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@ -83,8 +83,8 @@ public class HSSFSheet
private Sheet sheet;
private TreeMap rows;
private Workbook book;
private HSSFWorkbook workbook;
protected Workbook book;
protected HSSFWorkbook workbook;
private int firstrow;
private int lastrow;
private static POILogger log = POILogFactory.getLogger(HSSFSheet.class);

79
src/testcases/org/apache/poi/hssf/usermodel/TestHSSFPicture.java Normal file
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@ -0,0 +1,79 @@
/*
* 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.poi.hssf.usermodel;
import junit.framework.TestCase;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.ByteArrayOutputStream;
/**
* Test <code>HSSFPicture</code>.
*
* @author Yegor Kozlov (yegor at apache.org)
*/
public class TestHSSFPicture extends TestCase{
public void testResize() throws Exception {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sh1 = wb.createSheet();
HSSFPatriarch p1 = sh1.createDrawingPatriarch();
int idx1 = loadPicture( "src/resources/logos/logoKarmokar4.png", wb);
HSSFPicture picture1 = p1.createPicture(new HSSFClientAnchor(), idx1);
HSSFClientAnchor anchor1 = picture1.getPrefferedSize();
//assert against what would BiffViewer print if we insert the image in xls and dump the file
assertEquals(0, anchor1.getCol1());
assertEquals(0, anchor1.getRow1());
assertEquals(1, anchor1.getCol2());
assertEquals(9, anchor1.getRow2());
assertEquals(0, anchor1.getDx1());
assertEquals(0, anchor1.getDy1());
assertEquals(848, anchor1.getDx2());
assertEquals(240, anchor1.getDy2());
}
/**
* Copied from org.apache.poi.hssf.usermodel.examples.OfficeDrawing
*/
private static int loadPicture( String path, HSSFWorkbook wb ) throws IOException
{
int pictureIndex;
FileInputStream fis = null;
ByteArrayOutputStream bos = null;
try
{
fis = new FileInputStream( path);
bos = new ByteArrayOutputStream( );
int c;
while ( (c = fis.read()) != -1)
bos.write( c );
pictureIndex = wb.addPicture( bos.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG );
}
finally
{
if (fis != null)
fis.close();
if (bos != null)
bos.close();
}
return pictureIndex;
}
}