- Platform Windows XP
- JDK 1.4.2
- Batik 1.6
Hi
I am attempting to render some data to an SVG file which is produced as a
Java3d
TriangleStripArray. I do this by parsing through the individual triangles
and appending them
to a GeneralPath as follows:
path.moveTo(xTri1[0], yTri1[0]);
path.lineTo(xTri1[1], yTri1[1]);
path.lineTo(xTri1[2], yTri1[2]);
Then I close and fill the GeneralPath
The resulting SVG file looks great when viewed through the Adobe SVG plugin,
but when I view
it through squiggle, there are narrow gaps between all of the triangles.
When I use the
batik PNGTranscoder to convert the SVG file to a PNG, the narrow gaps become
a pixel wide and
the resulting image looks a mess.
If I fill the triangles individually rather than by appending them to a
general path, the
result is fine, but over tens of thousands of triangles there is a massive
loss in
performance and increase in file size. Can anyone suggest a way forward?
I have attached a segment of code which illustrates the problem:
import java.awt.Dimension;
import java.awt.Polygon;
import java.awt.geom.GeneralPath;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import org.apache.batik.svggen.SVGGraphics2D;
import org.apache.batik.svggen.SVGGraphics2DIOException;
import org.apache.batik.dom.GenericDOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Element;
public class SVGTest {
public SVGTest()
throws
SVGGraphics2DIOException,
IOException,
UnsupportedEncodingException
{
DOMImplementation domImpl =
GenericDOMImplementation.getDOMImplementation();
Document document =
domImpl.createDocument(null, "svg", null);
SVGGraphics2D graphics2d = new SVGGraphics2D(document);
int width = 200;
int height = 200;
Dimension size = new Dimension(width, height);
graphics2d.setSVGCanvasSize(size);
GeneralPath path =
new GeneralPath(GeneralPath.WIND_EVEN_ODD);
// Define triangle coordinates
int[] xTri1 = {120, 140, 130};
int[] yTri1 = {120, 120, 140};
int[] xTri2 = {120, 100, 130};
int[] yTri2 = {120, 140, 140};
// Draw triangle1
path.moveTo(xTri1[0], yTri1[0]);
path.lineTo(xTri1[1], yTri1[1]);
path.lineTo(xTri1[2], yTri1[2]);
// Draw triangle2
path.moveTo(xTri2[0], yTri2[0]);
path.lineTo(xTri2[1], yTri2[1]);
path.lineTo(xTri2[2], yTri2[2]);
// Close and fill path
path.closePath();
graphics2d.fill(path);
Element svgRoot = ((SVGGraphics2D)graphics2d).getRoot();
svgRoot.setAttributeNS(null, "viewBox",
"0, 0, " + String.valueOf(width) + ", " +
String.valueOf(height));
BufferedOutputStream outStream =
new BufferedOutputStream(
new FileOutputStream("c:/test.svg"));
Writer outWriter =
new OutputStreamWriter(outStream, "UTF-8");
graphics2d.stream(svgRoot, outWriter, true);
outWriter.flush();
outWriter.close();
}
public static void main(String[] args) {
try {
SVGTest test = new SVGTest();
} catch (IOException e) {
System.err.println("Doh! " + e);
}
}
}
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