Tiling Large SVG into Small Pieces

[Gang Su]

Dear All,

 

Thank you for your previous reply. 

What I was trying to do is to generate a svg containing all the gene
locations on the genome in one single file, then cut the entire svg into
small tiles.

I tried on mapWaadt.svg came with Batik, it worked fine. 

But I tried my own svg file, generated by perl and renderable by Adobe svg
plugin, Batik throws exception.

I have attached source codes.

I don't know it's my svg's problem or Batik, as it throwed 

thread "main" java.lang.OutOfMemoryError: Java heap space error.

Thank you very much!

 

Gang Su

Bioinformatics Student, University of Michigan

Java code:

package svgBatik;

import java.io.*;

import java.awt.*;

import java.io.IOException;

 

import org.apache.batik.dom.svg.SAXSVGDocumentFactory;

import org.apache.batik.util.XMLResourceDescriptor;

import org.apache.batik.transcoder.image.PNGTranscoder;

import org.apache.batik.transcoder.TranscoderInput;

import org.apache.batik.transcoder.TranscoderOutput;

 

import org.w3c.dom.Document;

 

public class ImageTest {

 

      public static void main(String[] args)

      {

            try{

                  String parser =
XMLResourceDescriptor.getXMLParserClassName();

                  SAXSVGDocumentFactory f = new
SAXSVGDocumentFactory(parser);

                  //String uri =
"file:/d:/SVG/Batik/batik-1.7/samples/mapWaadt.svg";

                  

                  String uri = "file:/d:/perlSVG.svg";

                  Document doc = f.createDocument(uri);

                  //complex grammar...

                  //NO error was thrown. The parsing was successuful.

                  System.out.println("Parsing Completed");

                  //define input

                  TranscoderInput input = new TranscoderInput(doc);
//initialize as a document

                  

                  //define output

                  OutputStream ostream = new
FileOutputStream("d:/outsvg.png");

                  TranscoderOutput output = new TranscoderOutput(ostream);

                  

                  //define transcoder

                  PNGTranscoder t = new PNGTranscoder();

                  t.addTranscodingHint(PNGTranscoder.KEY_AOI, new
Rectangle(500,0,1000,50));

                  t.transcode(input, output);

            }

            catch (Exception ex)//easy way is to catch the general
exception, well..

            {

                  System.out.println(ex.toString());

            }

            

            

      }

}

Part of the svg:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<?xml-stylesheet type="text/css" href="svgStyle.css" ?>

 

<svg height="50" id="document_element" width="250000"
xmlns="http://www.w3.org/2000/svg";
xmlns:xlink="http://www.w3.org/1999/xlink";>

  <rect class="rect" height="20" width="3" x="1" y="10" />

  <rect class="rect" height="20" width="10" x="4" y="10" />

  <rect class="rect" height="20" width="15" x="4" y="10" />

  <rect class="rect" height="20" width="3" x="4" y="10" />

  <rect class="rect" height="20" width="5" x="4" y="10" />

  <rect class="rect" height="20" width="15" x="4" y="10" />

  <rect class="rect" height="20" width="2" x="5" y="10" />

  <rect class="rect" height="20" width="13" x="6" y="10" />

  <rect class="rect" height="20" width="3" x="6" y="10" />

  <rect class="rect" height="20" width="12" x="7" y="10" />

  <rect class="rect" height="20" width="1" x="24" y="10" />

  <rect class="rect" height="20" width="1" x="58" y="10" />

  <rect class="rect" height="20" width="0" x="127" y="10" />

  <rect class="rect" height="20" width="0" x="127" y="10" />

  <rect class="rect" height="20" width="0" x="128" y="10" />

  <rect class="rect" height="20" width="0" x="129" y="10" />

  <rect class="rect" height="20" width="0" x="310" y="10" />

  <rect class="rect" height="20" width="0" x="311" y="10" />

  <rect class="rect" height="20" width="0" x="314" y="10" />

  <rect class="rect" height="20" width="0" x="314" y="10" />

  <rect class="rect" height="20" width="0" x="314" y="10" />

  <rect class="rect" height="20" width="1" x="317" y="10" />

  <rect class="rect" height="20" width="1" x="357" y="10" />

  <rect class="rect" height="20" width="1" x="410" y="10" />

  <rect class="rect" height="20" width="2" x="552" y="10" />

  <rect class="rect" height="20" width="1" x="556" y="10" />

  <rect class="rect" height="20" width="0" x="558" y="10" />

  <rect class="rect" height="20" width="0" x="558" y="10" />

  <rect class="rect" height="20" width="1" x="559" y="10" />

  <rect class="rect" height="20" width="1" x="610" y="10" />

  <rect class="rect" height="20" width="0" x="653" y="10" />

  <rect class="rect" height="20" width="0" x="653" y="10" />

  <rect class="rect" height="20" width="0" x="654" y="10" />

  <rect class="rect" height="20" width="0" x="654" y="10" />

  <rect class="rect" height="20" width="0" x="658" y="10" />

  <rect class="rect" height="20" width="0" x="658" y="10" />

  <rect class="rect" height="20" width="0" x="658" y="10" />

  <rect class="rect" height="20" width="0" x="661" y="10" />

  <rect class="rect" height="20" width="0" x="665" y="10" />

</svg>

 

Thank you very much!