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Hello,
I've written a transcoder, which creates html image maps.
Now, there are a few last questions:
- - Could it go into the cvs?
- - Could someone look over it, as it's my first programming with batik?
- - I have a last problem with SVGUtilities.getDescription. It simply always
gives me an empty string. Has someone a hint why?
- - I have used javax.xml.transform for xml serialization. Is there a better way
in batik, as it was before not used?
What I want to do before commiting:
- - Seperating in more classes. I'd like to extract the polygons with user space
coordinates in one class, create the SAX events for the html elements in
another and have the serialization in another. This is because I'd like to
have it as transformer in cocoon.
Thanks in advance
Torsten Knodt
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Index: sources/org/apache/batik/apps/rasterizer/DestinationType.java
===================================================================
RCS file: /home/cvspublic/xml-batik/sources/org/apache/batik/apps/rasterizer/DestinationType.java,v
retrieving revision 1.1
diff -r1.1 DestinationType.java
14a15
> import org.apache.batik.transcoder.imagemap.ImageMapTranscoder;
28a30
> public static final String IMGMAP_STR = "text/xml";
33a36
> public static final int IMGMAP_CODE = 4;
38a42
> public static final String IMGMAP_EXTENSION = ".xml";
43a48
> public static final DestinationType IMGMAP = new DestinationType(IMGMAP_STR, IMGMAP_CODE, IMGMAP_EXTENSION);
88a94,95
> case IMGMAP_CODE:
> return new ImageMapTranscoder();
101c108
< return new DestinationType[]{PNG, JPEG, TIFF, PDF};
---
> return new DestinationType[]{PNG, JPEG, TIFF, PDF, IMGMAP};
113a121,122
> case IMGMAP_CODE:
> return IMGMAP;
Index: sources/org/apache/batik/apps/rasterizer/Main.java
===================================================================
RCS file: /home/cvspublic/xml-batik/sources/org/apache/batik/apps/rasterizer/Main.java,v
retrieving revision 1.22
diff -r1.22 Main.java
38a39
> import org.apache.batik.transcoder.imagemap.ImageMapTranscoder;
481a483
> mimeTypeMap.put("text/xml", DestinationType.IMGMAP);
Index: sources/org/apache/batik/transcoder/SVGAbstractTranscoder.java
===================================================================
RCS file: /home/cvspublic/xml-batik/sources/org/apache/batik/transcoder/SVGAbstractTranscoder.java,v
retrieving revision 1.1
diff -r1.1 SVGAbstractTranscoder.java
81a82,91
> * Current bridge context
> */
> protected BridgeContext ctx;
>
> /**
> * Current gvt builder
> */
> protected GVTBuilder builder;
>
> /**
150c160,161
< BridgeContext ctx = new BridgeContext(userAgent);
---
> // TK: moved ctx to class
> ctx = new BridgeContext(userAgent);
155c166,167
< GVTBuilder builder = new GVTBuilder();
---
> // TK: moved builder to class
> builder = new GVTBuilder();
178,179c190,191
< ctx = null;
< builder = null;
---
> // TK: ctx = null;
> // TK: builder = null;
/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package org.apache.batik.transcoder.imagemap;
import org.apache.batik.transcoder.SVGAbstractTranscoder;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.bridge.SVGUtilities;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import java.awt.geom.PathIterator;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.DocumentTraversal;
import org.w3c.dom.traversal.NodeFilter;
import org.w3c.dom.traversal.NodeIterator;
import org.w3c.dom.svg.SVGAElement;
import org.w3c.dom.svg.SVGDocument;
import org.w3c.dom.svg.SVGElement;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.SAXException;
/**
* This class transcodes an input to a html imagemap.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Torsten Knodt</a>
*/
public class ImageMapTranscoder extends SVGAbstractTranscoder {
private final String XHTML_URI = "http://www.w3.org/1999/xhtml";;
private final String CDATA = "CDATA";
private final String AREA_TAG = "area";
private final String MAP_TAG = "map";
private final String TITLE_ATTR = "title";
private final String ALT_ATTR = "alt";
private final String AREA_TAG_SHAPE_ATTR = "shape";
private final String AREA_TAG_SHAPE_ATTR_POLY = "poly";
private final String AREA_TAG_COORDS_ATTR = "coords";
private final String AREA_TAG_HREF_ATTR = "href";
private final String XHTML_SYSID = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";;
private final String XHTML_PUBID = "-//W3C//DTD XHTML 1.0 Strict//EN";
/**
* Constructs a new <tt>ImageMapTranscoder</tt>.
*/
public ImageMapTranscoder() {
}
/**
* Get SAX Transformer factory
*
* @result SAX Transformer factory to use
*/
private SAXTransformerFactory getTransformerHandlerFactory()
{
return (SAXTransformerFactory) SAXTransformerFactory.newInstance();
}
/**
* Get SAX Transformer from Factory
*
* @param output the output where to transcode
* @result the transformer handler
*/
private TransformerHandler getTransformerHandler(TranscoderOutput output)
throws TransformerConfigurationException
{
SAXTransformerFactory tfactory = getTransformerHandlerFactory();
if (tfactory.getFeature(SAXSource.FEATURE) && tfactory.getFeature(StreamResult.FEATURE))
{
TransformerHandler ch = tfactory.newTransformerHandler();
ch.setResult (new StreamResult (output.getOutputStream()));
return ch;
}
return null;
}
/**
* Configure the SAX transformer handler
*
* @param th the SAX transformer handler
*/
private void configureTransformerHandler(TransformerHandler th)
{
// th.setSystemId (XHTML_SYSID);
// FIXME: ID/ name attribute must be added to map element to make output valid
}
/**
* Configure the SAX transformer
*
* @param th the SAX transformer
*/
private void configureTransformer(Transformer t)
{
// t.setOutputProperty (OutputKeys.DOCTYPE_PUBLIC, XHTML_PUBID);
// t.setOutputProperty (OutputKeys.DOCTYPE_SYSTEM, XHTML_SYSID);
// FIXME: ID/ name attribute must be added to map element to make output valid
t.setOutputProperty (OutputKeys.INDENT, "yes");
t.setOutputProperty (OutputKeys.MEDIA_TYPE, "text/xml");
t.setOutputProperty (OutputKeys.STANDALONE, "no");
t.setOutputProperty (OutputKeys.OMIT_XML_DECLARATION, "no");
t.setOutputProperty (OutputKeys.METHOD, "xml");
}
/**
* Sets the title attribute for an element
*
* @param element the element to fetch the title for
* @param att the Attribute Implementation to use
*/
private void setTitle(SVGElement element, AttributesImpl att)
{
// We could also use xlink:title, but I think svg:desc is better.
String s = SVGUtilities.getDescription (element);
if (s != null)
if (! s.equals (""))
att.addAttribute("", TITLE_ATTR, TITLE_ATTR, CDATA, s);
}
/**
* Sets the alt attribute for an element
*
* @param element the element to fetch the title for
* @param att the Attribute Implementation to use
*/
private void setAlt(SVGElement element, AttributesImpl att)
{
// Here svg:title should be used instead of svg:desc, I think. Perhaps xlink:title would also be an idea.
String s = SVGUtilities.getDescription (element);
System.out.println (s);
if (s == null)
s = "";
att.addAttribute("", ALT_ATTR, ALT_ATTR, CDATA, s);
}
/**
* Transcodes the specified Document as an image in the specified output.
*
* @param document the document to transcode
* @param uri the uri of the document or null if any
* @param output the ouput where to transcode
* @exception TranscoderException if an error occured while transcoding
*/
protected void transcode(Document document,
String uri,
TranscoderOutput output)
throws TranscoderException
{
super.transcode(document, uri, output);
TransformerHandler filter;
try {
filter = getTransformerHandler(output);
} catch (TransformerConfigurationException ex)
{
throw new TranscoderException (ex);
}
configureTransformerHandler (filter);
configureTransformer (filter.getTransformer());
AttributesImpl myatt = new AttributesImpl();
setTitle ((SVGElement) (document.getDocumentElement()), myatt);
try {
filter.startDocument();
// filter.startDTD(MAP_TAG, XHTML_PUBID, XHTML_SYSID);
// filter.endDTD();
// FIXME: ID/ name attribute must be added to map element to make output valid
filter.startElement (XHTML_URI, MAP_TAG, MAP_TAG, myatt);
} catch (SAXException ex) { throw new TranscoderException (ex); }
NodeIterator i = ((DocumentTraversal) document).createNodeIterator(document, NodeFilter.SHOW_ELEMENT, null, true);
Node node;
while ((node = i.nextNode()) != null)
{
SVGAElement e;
try {
e = (SVGAElement) node;
} catch (ClassCastException ex) { e = null; }
if (e != null)
{
int state = PathIterator.SEG_CLOSE;
String coords = "";
int[] lastpoints = null;
for (PathIterator path = builder.build (ctx,e).getOutline().getPathIterator(curTxf, 1.0); ! path.isDone(); path.next())
{
float[] points = new float[6];
int seg = path.currentSegment (points);
int[] newpoints = { Math.round(points[0]), Math.round(points[1]) };
switch (seg)
{
case PathIterator.SEG_CLOSE:
// End of path segment, so push out Tag
if (! coords.equals(""))
{
AttributesImpl att = new AttributesImpl();
att.addAttribute("", AREA_TAG_SHAPE_ATTR, AREA_TAG_SHAPE_ATTR, CDATA, AREA_TAG_SHAPE_ATTR_POLY);
att.addAttribute("", AREA_TAG_COORDS_ATTR, AREA_TAG_COORDS_ATTR, CDATA, coords);
att.addAttribute("", AREA_TAG_HREF_ATTR, AREA_TAG_HREF_ATTR, CDATA, e.getHref().getBaseVal());
setTitle (e, att);
setAlt (e, att);
try {
filter.startElement(XHTML_URI, AREA_TAG, AREA_TAG, att);
filter.endElement(XHTML_URI, AREA_TAG, AREA_TAG);
} catch (SAXException ex) { throw new TranscoderException (ex); }
coords = "";
lastpoints = null;
}
break;
case PathIterator.SEG_CUBICTO:
// Cubic segment not allowed in flattened path
throw new TranscoderException ("Cubic segment not allowed in flattened path");
case PathIterator.SEG_QUADTO:
// Quad segment not allowed in flattened path
throw new TranscoderException ("Quad segment not allowed in flattened path");
case PathIterator.SEG_LINETO:
if (coords.equals(""))
throw new TranscoderException ("Line segment not allowed at begin of path");
// Add line segment to polygon coords
if (! lastpoints.equals (newpoints))
coords = coords + "," + newpoints[0] + "," + newpoints[1];
break;
case PathIterator.SEG_MOVETO:
if (! coords.equals(""))
throw new TranscoderException ("Move segment only allowed at begin of path");
// Use move segment as polygon start coords
coords = newpoints[0] + "," + newpoints[1];
break;
default:
throw new TranscoderException ("Unknown segment with type number " + seg);
}
lastpoints = newpoints;
}
}
}
try {
filter.endElement (XHTML_URI, MAP_TAG, MAP_TAG);
filter.endDocument();
} catch (SAXException ex) { throw new TranscoderException (ex); }
}
}
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