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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2025.0
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.math;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.Writer;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import javax.swing.Icon;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;

import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.log.Logme;

public class ConverterSvg {

	private final Icon icon;

	public ConverterSvg(Icon icon) {
		this.icon = icon;
	}

	static {
		try {
			// DefaultTeXFont.registerAlphabet(new CyrillicRegistration());
			// DefaultTeXFont.registerAlphabet(new GreekRegistration());
			final Class clDefaultTeXFont = Class.forName("org.scilab.forge.jlatexmath.DefaultTeXFont");
			final Class clAlphabetRegistration = Class.forName("org.scilab.forge.jlatexmath.AlphabetRegistration");
			final Method registerAlphabet = clDefaultTeXFont.getMethod("registerAlphabet", clAlphabetRegistration);
			registerAlphabet.invoke(null,
					Class.forName("org.scilab.forge.jlatexmath.cyrillic.CyrillicRegistration").newInstance());
			registerAlphabet.invoke(null,
					Class.forName("org.scilab.forge.jlatexmath.greek.GreekRegistration").newInstance());

		} catch (Exception e) {
			Logme.error(e);
		}

	}

	private Dimension dimension;

	public String getSvg(double scale, boolean fontAsShapes, Color backgroundColor)
			throws ClassNotFoundException, IllegalAccessException, IllegalArgumentException, InvocationTargetException,
			NoSuchMethodException, SecurityException, InstantiationException, IOException {
		// DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
		final Class clGenericDOMImplementation = Class.forName("org.apache.batik.dom.GenericDOMImplementation");
		final DOMImplementation domImpl = (DOMImplementation) clGenericDOMImplementation
				.getMethod("getDOMImplementation").invoke(null);
		final String svgNS = "http://www.w3.org/2000/svg";
		final Document document = domImpl.createDocument(svgNS, "svg", null);

		// SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(document);
		final Class clSVGGeneratorContext = Class.forName("org.apache.batik.svggen.SVGGeneratorContext");
		final Object ctx = clSVGGeneratorContext.getMethod("createDefault", Document.class).invoke(null, document);

		// SVGGraphics2D g2 = new SVGGraphics2D(ctx, fontAsShapes);
		final Class clSVGGraphics2D = Class.forName("org.apache.batik.svggen.SVGGraphics2D");
		final Graphics g2 = (Graphics) clSVGGraphics2D.getConstructor(clSVGGeneratorContext, boolean.class)
				.newInstance(ctx, fontAsShapes);

		dimension = new Dimension(icon.getIconWidth(), icon.getIconHeight());
		// g2.setSVGCanvasSize(dimension);
		g2.getClass().getMethod("setSVGCanvasSize", Dimension.class).invoke(g2, dimension);
		if (backgroundColor != null) {
			g2.setColor(backgroundColor);
			g2.fillRect(0, 0, icon.getIconWidth(), icon.getIconHeight());
		}

		icon.paintIcon(null, g2, 0, 0);

		final Writer out = new CharArrayWriter();

		final boolean useCSS = true;
		// g2.stream(out, useCSS);
		g2.getClass().getMethod("stream", Writer.class, boolean.class).invoke(g2, out, useCSS);

		out.flush();
		out.close();

		return out.toString();
	}

	public XDimension2D getDimension() {
		return XDimension2D.fromDimension(dimension);
	}

}