Re:Re: include viewbox in svg generation

2004-10-25 Thread rob van nues 
Thanks for the fast reply,
it made me ralise that the whole shebang of stylesheet etc (taken from the 
example) could be omitted.

The main problem was that the output was written twice to the same file, 
doubling the headers, one with the viewbox set, the other not. The problem had 
to do with the order of calls. I had to take out the line that used to create 
the output

svg2d.stream(outWriter, useCss);
and move the root.setAttribute() to after I had rendered the java graphics to 
the  SVGGraphics2D svg2d.Then the call

svg2d.stream(root,outWriter, useCss);
did what I wanted it to do:
a squiggle-readable file reacting to resizing the viewing frame.
relevant body of the method:
//
	BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(file));
// Get a DOMImplementation
DOMImplementation domImpl = 
GenericDOMImplementation.getDOMImplementation();

// Create an instance of org.w3c.dom.Document
Document document = domImpl.createDocument(null, svg, null);
// set context (i.e parameters) of the document
SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(document);
// Create an instance of the SVG Generator with context and document
SVGGraphics2D svg2d = new SVGGraphics2D(ctx, false);
// stream out SVG to the standard output using UTF-8
// character to byte encoding
boolean useCSS = true; // we want to use CSS style attribute
Writer outWriter = new OutputStreamWriter(out, UTF-8);
// Ask the canvas to render into the SVG Graphics2D implementation
canvas.paintSVG(svg2d);
// adjust header to make resulting image resize with its 'viewbox'
Element root= svg2d.getRoot();
root.setAttributeNS(null, viewBox, 0, 0,+ canvas.getWidth() + , + 
canvas.getHeight() );

// write this root with rest to out
svg2d.stream(root,outWriter,useCSS);
out.close();
}
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include viewbox in svg generation

2004-10-24 Thread rvnues 
Hello, I tried to include a viewbox-attribute when exporting a Graphics2D to SVG using 
batik. 


I found some hints in the archive when searching 'viewbox' 

http://koala.ilog.fr/batik/mlists/batik-users/archives/msg01038.html
http://koala.ilog.fr/batik/mlists/batik-users/archives/msg01040.html
http://koala.ilog.fr/batik/mlists/batik-users/archives/msg01041.html
http://koala.ilog.fr/batik/mlists/batik-users/archives/msg01043.html
http://www.mail-archive.com/[EMAIL PROTECTED]/msg05387.html
http://www.mail-archive.com/[EMAIL PROTECTED]/msg05389.html


but they did not help me that much further.


I tried to include a viewbox via the batik-examples as given on the website (and as 
suggested in above links), using the given StyleSheetStyleHandler:

-begin copy
  public void createSVG( DrawingCanvas comp2SVG, File file) throws Exception {
setCanvas(comp2SVG);
   //exception will be trhown by code below, has to be caught by user
BufferedOutputStream out = new BufferedOutputStream(new 
FileOutputStream(file));
// Get a DOMImplementation
DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
// Create an instance of org.w3c.dom.Document
   // String svgNS = 
SVGSyntax.SVG_NAMESPACE_URI;//http://www.w3.org/2000/svg;//SVGDOMImplementation.SVG_NAMESPACE_URI;
Document document = domImpl.createDocument(null, svg, null);
// set context (i.e parameters) of the document
SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(document);

   CDATASection styleSheet = document.createCDATASection();
   ctx.setStyleHandler(new StyleSheetStyleHandler(styleSheet));
/** According to [EMAIL PROTECTED] do setPrecision(int precision)
 * to bypass the otherwise occurring java.lang.NullPointerException
 * at 
org.apache.batik.svggen.SVGGeneratorContext.doubleString(SVGGeneratorContext.java:420)
 * due to a bug in doubleString where we did not initialize the DecimalFormat 
object.
 **/
ctx.setPrecision(3); // 3 is SVG-default as mentioned in 
SVGGeneratorContext.java.
//something to set size of xml-document:  
ctx.setComment(Generated by The Visual Language with Batik SVG Generator);
// Create an instance of the SVG Generator with context and document
SVGGraphics2D svg2d  = new SVGGraphics2D(ctx, false);
//  add a style sheet to the definition section
Element root = svg2d.getRoot();
   Element defs = root.getElementById(SVGSyntax.ID_PREFIX_GENERIC_DEFS);
   Element style = 
document.createElementNS(SVGSyntax.SVG_NAMESPACE_URI,SVGSyntax.SVG_STYLE_TAG);
   style.setAttributeNS(null, SVGSyntax.SVG_TYPE_ATTRIBUTE, text/css);
   style.setAttributeNS(null, viewBox, 0, 0, 600, 400 );
   style.appendChild(styleSheet);
   defs.appendChild(style);
   
// Finally, stream out SVG to the standard output using UTF-8
// character to byte encoding
boolean useCSS = true; // we want to use CSS style attribute
Writer outWriter = new OutputStreamWriter(out, UTF-8);

// Ask the canvas to render into the SVG Graphics2D implementation
//if(canvas==null) return; //would never happen because of setCanvas();
canvas.paintSVG(svg2d);
canvas.repaint();

svg2d.stream(outWriter, useCSS);
out.close();
}

 end class

But the compiler (in JDK 1.5) doesn't accept:

root.getElementById(SVGSyntax.ID_PREFIX_GENERIC_DEFS);

(the method belongs to Document, not Element...)

How can I proceed ...?

rob




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Re: include viewbox in svg generation

2004-10-24 Thread Thomas DeWeese 
Hi Rob,
[EMAIL PROTECTED] wrote:
Hello, I tried to include a viewbox-attribute when 
exporting a Graphics2D to SVG using batik. 

I tried to include a viewbox via the batik-examples as given on the website 
(and as suggested in above links), using the given StyleSheetStyleHandler:
[...]
/** According to [EMAIL PROTECTED] do setPrecision(int precision)
 * to bypass the otherwise occurring java.lang.NullPointerException
 * at 
org.apache.batik.svggen.SVGGeneratorContext.doubleString(SVGGeneratorContext.java:420)
 * due to a bug in doubleString where we did not initialize the DecimalFormat 
object.
 **/
ctx.setPrecision(3); // 3 is SVG-default as mentioned in 
SVGGeneratorContext.java.
  This bug has been fixed for a while so you shouldn't have to do
this (although it doesn't hurt much).
//something to set size of xml-document:  
ctx.setComment(Generated by The Visual Language with Batik SVG Generator);
// Create an instance of the SVG Generator with context and document
SVGGraphics2D svg2d  = new SVGGraphics2D(ctx, false);
//  add a style sheet to the definition section
Element root = svg2d.getRoot();
   Element defs = root.getElementById(SVGSyntax.ID_PREFIX_GENERIC_DEFS);
getElementById is also on the org.w3c.dom.svg.SVGSVGElement
interface, which is the real type of 'root'.
   Element style = 
document.createElementNS(SVGSyntax.SVG_NAMESPACE_URI,SVGSyntax.SVG_STYLE_TAG);
   style.setAttributeNS(null, SVGSyntax.SVG_TYPE_ATTRIBUTE, text/css);
   style.setAttributeNS(null, viewBox, 0, 0, 600, 400 );
   This should probably be 'root' that you set 'viewBox' on
not the 'style' element.
   style.appendChild(styleSheet);
   defs.appendChild(style);
   There is no real need for 'style' to be a child of defs, I normally
stick under the root SVG element ('root' in your code).
But the compiler (in JDK 1.5) doesn't accept:
root.getElementById(SVGSyntax.ID_PREFIX_GENERIC_DEFS);
(the method belongs to Document, not Element...)
How can I proceed ...?
   See above.
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