Hi,
i am using following class to construct the Buffered image from SVG
file. I got this code from Batik users site only. In this when i set
TranscodingHints.setHeight, TranscodingHints.setWidth to different values
say width=50 and height=750. This is not setting the height properly. It
just renders it as 50, 50. Is image transcoder keeps the aspect ration in
case of diffence betweek width and height is too. Is there any way to
overcome that.
I tried samething with the Batik app's svgrasterizer that is also
not giving me the proper resul.
What i want is when i specify the witdth and height it should
respond properly. Please let me know if there is a way to do it.
Thanks in advance
Bala
import java.awt.image.BufferedImage;
import java.awt.Paint;
import java.awt.Dimension;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.Reader;
import java.io.IOException;
import java.io.FileWriter;
import java.net.URL;
import java.util.Map;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.TranscodingHints;
import org.apache.batik.bridge.UserAgentAdapter;
import org.apache.batik.transcoder.image.ImageTranscoder;
import org.apache.batik.bridge.DocumentLoader;
import org.apache.batik.transcoder.image.JPEGTranscoder;
import org.w3c.dom.svg.SVGDocument;
import org.w3c.dom.Document;
import org.apache.batik.swing.JSVGCanvas;
public class SVGRasterizer
{
/**
* The transcoder input.
*/
protected TranscoderInput input;
/**
* The transcoder hints.
*/
protected TranscodingHints hints = new TranscodingHints();
/**
* The image that represents the SVG document.
*/
protected BufferedImage img;
/**
* Constructs a new SVGRasterizer.
*
* @param uri the uri of the document to rasterize
*/
/*public SVGRasterizer(String uri) {
this.input = new TranscoderInput(uri);
}*/
/**
* Constructs a new SVGRasterizer.
*
* @param url the URL of the document to rasterize
*/
public SVGRasterizer(URL url) {
this.input = new TranscoderInput(url.toString());
}
public SVGRasterizer(String filename) {
File f = new File(filename);
try
{
this.input = new TranscoderInput(f.toURL().toString());
}catch(Exception e)
{
e.printStackTrace();
}
}
/**
* Constructs a new SVGRasterizer converter.
*
* @param istream the input stream that represents the SVG document to
* rasterize
*/
public SVGRasterizer(InputStream istream) {
this.input = new TranscoderInput(istream);
}
/**
* Constructs a new SVGRasterizer converter.
*
* @param reader the reader that represents the SVG document to
rasterize
*/
public SVGRasterizer(Reader reader) {
this.input = new TranscoderInput(reader);
}
public SVGRasterizer() {
//this.input = new TranscoderInput(reader);
}
/**
* Constructs a new SVGRasterizer converter.
*
* @param document the SVG document to rasterize
*/
public SVGRasterizer(SVGDocument document) {
this.input = new TranscoderInput(document);
}
/**
* Returns the image that represents the SVG document.
*/
public BufferedImage createBufferedImage() throws TranscoderException,
IOException
{
Rasterizer r = new Rasterizer();
r.setTranscodingHints((Map)hints);
r.transcode(input, null);
return img;
}
public BufferedImage resizeBufferedImage(Dimension d) throws
TranscoderException, IOException
{
if(input != null)
{
this.setImageDimension(d);
Rasterizer r = new Rasterizer();
r.setTranscodingHints((Map)hints);
r.transcode(input, null);
r = null; //for garbage collection
}
return img;
}
public BufferedImage createBufferedImage( Dimension d) throws
TranscoderException, IOException
{
this.setImageDimension(d);
Rasterizer r = new Rasterizer();
r.setTranscodingHints((Map)hints);
r.transcode(input, null);
r = null;
return img;
}
public BufferedImage createJPG(File f) throws
TranscoderException,IOException
{
Rasterizer r = new Rasterizer();
JPEGTranscoder jpeg = new JPEGTranscoder();
r.setTranscodingHints((Map)hints);
File file = new File("image.jpg");
FileWriter fw = new FileWriter(file) ;
TranscoderOutput output = new TranscoderOutput(fw);
r.transcode(input, output);
r.setTranscodingHints((Map)hints);
jpeg.transcode(input, output);
return img;
}
/**
* Sets the width of the image to rasterize.
*
* @param width the image width
*/
public void setImageWidth(float width) {
hints.put(ImageTranscoder.KEY_WIDTH, new Float(width));
}
/**
* Sets the height of the image to rasterize.
*
* @param width the image height
*/
public void setImageHeight(float height) {
hints.put(ImageTranscoder.KEY_HEIGHT, new Float(height));
}
public void setImageDimension(Dimension d)
{
hints.put(ImageTranscoder.KEY_WIDTH, new Float(d.width));
hints.put(ImageTranscoder.KEY_HEIGHT, new Float(d.height));
}
public void setArea(Rectangle2D area)
{
hints.put(ImageTranscoder.KEY_AOI, area);
}
/**
* Sets the preferred language to use. SVG documents can provide text in
* multiple languages, this method lets you control which language to
use
* if possible. e.g. "en" for english or "fr" for french.
*
* @param language the preferred language to use
*/
public void setLanguages(String language) {
hints.put(ImageTranscoder.KEY_LANGUAGE, language);
}
/**
* Sets the unit conversion factor to the specified value. This method
* lets you choose how units such as 'em' are converted. e.g. 0.26458 is
* 96dpi (the default) or 0.3528 is 72dpi.
*
* @param px2mm the pixel to millimeter convertion factor.
*/
public void setPixelToMMFactor(float px2mm) {
hints.put(ImageTranscoder.KEY_PIXEL_TO_MM, new Float(px2mm));
}
/**
* Sets the uri of the user stylesheet. The user stylesheet can be used
to
* override styles.
*
* @param uri the uri of the user stylesheet
*/
public void setUserStyleSheetURI(String uri) {
hints.put(ImageTranscoder.KEY_USER_STYLESHEET_URI, uri);
}
/**
* Sets whether or not the XML parser used to parse SVG document should
be
* validating or not, depending on the specified parameter. For futher
* details about how media work, see the
* <a href="http://www.w3.org/TR/CSS2/media.html";;>Media types in the
CSS2
* specification</a>.
*
* @param b true means the XML parser will validate its input
*/
public void setXMLParserValidating(boolean b) {
hints.put(ImageTranscoder.KEY_XML_PARSER_VALIDATING,
(b ? Boolean.TRUE : Boolean.FALSE));
}
/**
* Sets the media to rasterize. The medium should be separated by
* comma. e.g. "screen", "print" or "screen, print"
*
* @param media the media to use
*/
public void setMedia(String media) {
hints.put(ImageTranscoder.KEY_MEDIA, media);
}
/**
* Sets the alternate stylesheet to use. For futher details, you can
have
* a look at the <a
href="http://www.w3.org/TR/xml-stylesheet/";;>Associating
* Style Sheets with XML documents</a>.
*
* @param alternateStylesheet the alternate stylesheet to use if
possible
*/
public void setAlternateStylesheet(String alternateStylesheet) {
hints.put(ImageTranscoder.KEY_ALTERNATE_STYLESHEET,
alternateStylesheet);
}
/**
* Sets the Paint to use for the background of the image.
*
* @param p the paint to use for the background
*/
public void setBackgroundColor(Paint p) {
hints.put(ImageTranscoder.KEY_BACKGROUND_COLOR, p);
}
/**
* An image transcoder that stores the resulting image.
*/
protected class Rasterizer extends ImageTranscoder {
public BufferedImage createImage(int w, int h)
{
return new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
}
public void writeImage(BufferedImage img, TranscoderOutput output)
throws TranscoderException
{
SVGRasterizer.this.img = img;
}
}
}
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